OPTICALIWIRELESS TRANSMISSION APPARATUS, OPTICALIWIRELESS TRANSMISSION METHOD AND
OPTICALIWIRELESS TRANSMISSION SYSTEM
[Technical Field]
[0001] The present invention relates to an optical/wireless transmission
10 apparatus, an optical/wireless transmission method and an optical/wireless
transmission system, and, in particular, relates to an optical/wireless
transmission apparatus, an opticallwireless transmission method and an
optica11wireless transmission system that, in response to a signal from a
control system, determines in which direction and at which frequency to
15 transmit an input signal.
Background Art
[0002] As for the transmission systems related to the present invention,
systems are separated for optical transmission and for wireless
20 transmission. In optical transmission systems, an optical switching
apparatus equipped with a wavelength selection function that selects an
arbitrary wavelength and enables transmission with an arbitrary path exists,
but a function that selects a wireless transmission path as a choice of path
does not exist. Furthermore, also with regard to wireless transmission
25 systems, there does not exist a system that performs communication by
freely selecting an arbitrary path and an arbitrary frequency from a
plurality of frequencies, and transmission path operation in a fixed manner
has been performed.
[0003] On the other hand, as an example of a transmission system related
to the .present invention, a communication path switching system capable
of changing the transmission path from an optical communication path to a
wireless communication path is disclosed (refer to, for example, Patent
Literature 1).
5 [0004] The system described in Patent Literature 1 is configured so as to
be capable of securing a communication path even when a failure in
communication occurs on a wire communication path that connects a
network and a communication device that a user uses to each other.
[0005] Specifically, Patent Literature 1 describes a communication system
10 in which a subscriber line exchange and a communication path switching
apparatus are connected to each other by a plurality of bundled optical
fiber cables, and the communication path switching apparatus and each
communication apparatus are separately connected to each other by a
single-core optical fiber.
15 [0006] As for the system described in Patent Literature 1, in the
communication between the subscriber line exchange and each
communication apparatus, the communication between the communication
path switching apparatus and the individual communication apparatuses is
usually performed by using the respective single-core fibers. Then, when
20 a failure occurs between this communication path switching apparatus and
the c~mmunicationa pparatuses, the subscriber line exchange
communicates with the communication apparatuses wirelessly via a
wireless communication unit in the communication path switching
apparatus.
25 [Citation List]
[Patent Literature]
[0007]
[PTL 11 Japanese Patent Application Publication No. 2003-298605
[Summary of Invention]
[Technical Problem]
[0008] However, since systems are separated for optical transmission and
for wireless transmission in the relevant inventions, which leads to a
5 problem of not being able to communicate with counterpart apparatuses by
selectively using optical transmission and wireless transmission according
to the counterpart apparatuses to communicate with, and selecting an
arbitrary path and an arbitrary frequency from a plurality of frequencies,
and, furthermore, multiplexing signals as may be necessary.
10 [0009] On the other hand, Patent Literature 1 merely discloses a technique
that switches from the optical transmission to the wireless transmission
when a failure occurs, but does not disclose at all a technique that
selectively uses the optical transmission and the wireless transmission
according to a counterpart apparatus. Therefore, the invention described
15 in Patent Literature 1 cannot solve the problem to be solved by the present
invention.
[0010] Accordingly, an object of the present invention is to provide an
opticallwireless transmission apparatus, an opticallwireless transmission
method and an optical/wireless transmission system that are capable of
20 communicating with a counterpart apparatus by selectively using optical
transmission and wireless transmission according to the counterpart
apparatus to communicate with, and selecting an arbitrary path and an
arbitrary frequency from a plurality of frequencies, and, furthermore,
multiplexing signals as may be necessary.
25
[Solution to Problem]
[0011] In order to solve the aforementioned problem, the opticallwireless
transmission apparatus according to the present invention includes
converting a plurality of input baseband signals into optical or electrical
signals as may be necessary, modulating respective signals at different
frequencies, multiplexing a predetermined number of optical modulated
signals and a predetermined number of wireless modulated signals, and
transmitting an optical multiplexed signal via a predetermined optical fiber
5 or a wireless multiplexed signal via a directional antenna to a counterpart
apparatus.
[OO 121 Furthermore, the optical/wireless transmission method according to
the present invention includes an optical/wireless transmission step of
converting a plurality of input baseband signals into optical or electrical
10 signals as may be necessary, modulating respective signals at different
frequencies, multiplexing a predetermined number of optical modulated
signals and a predetermined number of wireless modulated signals, and
transmitting an optical multiplexed signal via a predetermined optical fiber
or a wireless multiplexed signal via a directional antenna to a counterpart
15 apparatus.
[OO 131 Furthermore, the optical/wireless transmission system according to
the present invention includes: optical/wireless transmission apparatuses; a
control system that instructs the optical/wireless transmission apparatuses
in which direction and at which frequency to transmit an input baseband
20 signal; and an optical branching apparatus that demultiplexes an optical
multiplexed signal output from one of the optical/wireless transmission
apparatuses to output to the other of a plurality of other optical/wireless
transmission apparatuses.
[0014] Furthermore, the program according to the present invention is
25 characterized by being a program for causing a control circuit of an
optical/wireless transmission apparatus to execute an optical/wireless
transmission step of converting a plurality of input baseband signals into
optical or electrical signals as may be necessary, modulating respective
signals at different frequencies, multiplexing a predetermined number of
optical modulated signals and a predetermined number of wireless
modulated signals, and transmitting an optical multiplexed signal via a
predetermined optical fiber or a wireless multiplexed signal via a
directional antenna to a counterpart apparatus.
5
[Advantageous Effects of Invention]
[0015] An exemplary effect according to the invention is that it becomes
possible to communicate with a counterpart apparatus by selectively using
the optical transmission and the wireless transmission according to the
10 counterpart apparatuses to communicate with, and selecting an arbitrary
path and an arbitrary frequency from a plurality of frequencies, and,
furthermore, multiplexing signals as may be necessary. As a result, an
optimum frequency, path and medium (optical or radio) can be selected
according to the status of the network, making it possible to make full
15 advantage of effectively utilizing the limited transmission resources
(optical transmission paths and spatial frequencies).
[Brief Description of Drawings]
[OO 161
20 Fig. 1 is a configuration diagram of an example of an optical/wireless
transmission system in an exemplary embodiment of the present invention;
Fig. 2 is a configuration diagram of an example of an optical/wireless
transmission apparatus in an exemplary embodiment of the present
invention; and
25 Fig. 3 is a flowchart illustrating an example of an optical/wireless
transmission method for an optical/wireless transmission apparatus in an
exemplary embodiment of the present invention.
[Description of Embodiments]
[0017] Hereinafter, exemplary embodiments of the present invention will
be described with reference to the accompanying drawings. Firstly, an
example of an optical/wireless transmission system in an exemplary
embodiment of the present invention will be described. Fig. 1 is a
5 configuration diagram of an example of the optical/wireless transmission
system in an exemplary embodiment of the present invention.
[0018] Referring to the drawing, the optical/wireless transmission system
in the exemplary embodiment of the present invention includes a plurality
of opticallwireless transmission apparatuses 1 (1 - 1 to 1-4 as an example),
10 an optical branching apparatus 2, a plurality of optical fibers 3 to 5, a
control system 6, and a plurality of directional antennas 18 (1 8-1 to 18-2 as
an example).
[OO 191 The opticallwireless transmission apparatus 1 - 1 is connected to the
optical branching apparatus 2 via the optical fiber 3. In addition, the
15 optical branching apparatus 2 is connected to the optical/wireless
transmission apparatus 1-3 via the optical fiber 4, and to the
optical/wireless transmission apparatus 1-4 via the optical fiber 5. The
opticallwireless transmission apparatus 1-1 is equipped with the
directional antenna 18- 1, the optical/wireless transmission apparatus 1-2 is
20 also equipped with the directional antenna 18-2, and wireless transmission
is performed between the opticallwireless transmission apparatus 1-1 and
the opticallwireless transmission apparatus 1-2.
[0020] Note that in the drawing, for the sake of convenience, only the
opticallwireless transmission apparatuses 1 - 1 and 1-2 are equipped with
25 the directional antennas 18-1 and 18-2, respectively. However, in reality,
all the opticallwireless transmission apparatuses 1 are equipped with
directional antennas 18. Furthermore, although the drawing illustrates,
as an example, a configuration in which the opticallwireless transmission
apparatus 1 - 1 and the optical/wireless transmission apparatus 1-2 are not
connected to each other by an optical fiber, it is also possible to connect
the optical/wireless transmission apparatus 1-1 and the optical/wireless
transmission apparatus 1-2 to each other by an optical fiber.
[0021] The control system 6 instructs the optical/wireless transmission
5 apparatuses 1-1 to 1-4 in which direction and at which frequency to
transmit an input baseband signal (regardless of whether the signal is an
optical signal or an electrical signal).
[0022] In other words, the optical/wireless transmission system illustrated
in Fig. 1, for example, performs wireless transmission between the
10 optical/wireless transmission apparatus 1 - 1 and the optical/wireless
transmission apparatus 1-2, and performs optical multiplex transmission at
wavelengths h l and h2 between the optical/wireless transmission apparatus
1-1 and the optical branching apparatus 2 via the optical fiber 3. The
optical branching apparatus 2 demultiplexes the optical multiplexed
15 signals having the wavelengths h l and h2, and optically transmits an
optical signal having the wavelength h l to the optical/wireless
transmission apparatus 1-3 via the optical fiber 4, and optically transmits
an optical signal having the wavelength h2 to the optical/wireless
transmission apparatus 1-4 via the optical fiber 5.
20 COO231 The transmission routes of signals illustrated in Fig. 1 are an
example of routes that the control system 6 designates to each of the
optical/wireless transmission apparatuses 1 - 1 to 1-4, and are not limited to
this example. The control system 6 is capable of setting transmission
routes so as to cause arbitrary optical/wireless transmission apparatuses 1
25 to communicate with each other, and is capable of selecting an optimum
frequency, path and medium (optical or radio) according to the status of
the network.
[0024]A control signal for matching the communication frequency of a
host optical/wireless transmission apparatus 1 and the communication
frequency of a counterpart opticallwireless transmission apparatus 1 with
each other is added beforehand to communication data transmittedlreceived
between the two apparatuses. The control signal is added to the
communication data on the basis of an instruction from the control system
5 6. Furthermore, the control system 6 sets an optimum transmission path
and selects an optimum frequency.
COO251 Next, an example of the configuration of the optical/wireless
transmission apparatus 1 will be described. Note that the configurations
of the plurality of opticallwireless transmission apparatuses 1 - 1 to 1-4 are
10 substantially the same. Fig. 2 is a configuration diagram of an example
of the optical/wireless transmission apparatus in accordance with the
present invention.
[0026] Referring to the drawing, the optical/wireless transmission
apparatus in an exemplary embodiment of the present invention includes a
15 plurality of baseband signal inputloutput circuits 11 -1 to 1 1-m (m is a
positive integer), a switching circuit 12, a plurality of wireless
inputloutput circuits 13- 1 to 13-n (n is a positive integer), a plurality of
optical inputloutput circuits 14-1 to 14-p (p is a positive integer), a
frequency selecting/switching/multiplexing circuit 15, a terminal
20 selecting/switching/multiplexing circuit 16, a control circuit 17, a
directional antenna 18, optical fibers 19- 1 to 19-r (r is a positive integer),
and a program storage unit 20.
[0027] The baseband signal inputloutput circuits 11 -1 to 11 -m inputloutput
input baseband signals, after converting the input baseband signals into
25 optical or electrical signals as may be necessary. In other words, the
input baseband signals are optical or electrical signals, and the baseband
signal input/output circuits 1 1 - 1 to 1 1 -m are equipped with an
optical/electrical conversion function of converting an input optical
baseband signal into an electrical signal, or an input electrical baseband
signal into an optical signal.
[0028] The switching circuit 12 outputs the baseband signals output from
the baseband signal inputloutput circuits 1 1 - 1 to 1 1 -m, to a predetermined
output destination, in other words, to any of the wireless inputloutput
5 circuits 13-1 to 13-n and the optical inputloutput circuits 14-1 to 14-p,
after converting the baseband signals into optical or electrical signals as
may be necessary. Furthermore, the switching circuit 12 is also equipped
with a function of outputting the baseband signals output from the wireless
inputloutput circuits 13- 1 to 13 -n and the optical inputloutput circuits 14- 1
10 to 14-p, to the baseband signal inputloutput circuits 1 1-1 to I 1 -m, after
converting the baseband signals into optical or electrical signals as may be
necessary.
[0029] The wireless inputloutput circuits 13- 1 to 13-n modulate respective
electrical baseband signals output from the switching circuit 12 at different
15 frequencies, or demodulate wireless modulated signals output from the
frequency selecting/switching/multiplexing circuit 15.
[0030] The optical inputloutput circuits 14- 1 to 14-p modulate respective
optical baseband signals output from the switching circuit 12 at different
frequencies, or demodulate optical modulated signals output from the
20 terminal selecting/switching/multiplexing circuit 16. Note that each of
the optical inputloutput circuits 14-1 to 14-p includes a light source and a
light receiving element that are not illustrated in the drawings. Therefore,
each of the optical inputloutput circuits 14-1 to 14-p is also equipped with
an electrical/optical conversion function.
25 [003 11 The frequency selectinglswitching/multiplexing circuit 15
multiplexes the wireless modulated signals output from a predetermined
number of circuits of the plurality of wireless inputloutput circuits 13-1 to
13-n, and transmits multiplexed signals to a counterpart apparatus via the
directional antenna 18. Furthermore, the frequency
selectinglswitchinglrnultiplexing circuit 15 is equipped with a function of
outputting signals obtained by demultiplexing a wireless multiplexed
signal received via the directional antenna 18 to predetermined wireless
inputloutput circuits 13.
5 [0032] The terminal selectinglswitchinglmultiplexing circuit 16
multiplexes the optical modulated signals output from a predetermined
number of circuits of the plurality of optical inputloutput circuits 14-1 to
14-p, and transmits multiplexed signals to a counterpart apparatus via a
predetermined optical fiber 19. Furthermore, the terminal
10 selecting/switching/multiplexing circuit 16 is equipped with a function of
demultiplexing an optical multiplexed signal received via any of the
optical fibers 19-1 to 19-r, and outputting demultiplexed signals to
predetermined optical inputloutput circuits 14.
[0033] The control circuit 17 carries out the frequency selection and the
15 modulation/demodulation by controlling the wireless inputloutput circuits
13- 1 to 13-n and the optical inputloutput circuits 14-1 to 14-p, and causes
the optical signals and the wireless signals to be transmitted to an arbitrary
path by controlling the baseband signal inputloutput circuits 11, the
switching circuit 12, the frequency selecting/switching/multiplexing
20 circuit 15 and the terminal selecting/switching/multiplexing circuit 16.
LO0341 Next, an example of an opticallwireless transmission method for an
opticallwiceless transmission apparatus in an exemplary embodiment of the
present invention will be described with reference to a flowchart. Fig. 3
is a flowchart illustrating the example of the optical/wireless transmission
25 method for the opticallwireless transmission apparatus in the exemplary
embodiment of the present invention.
[0035] Note that the operations below are executed by the control circuit
17 controlling the baseband signal inputloutput circuits 11, the switching
circuit 12, the frequency selectinglswitchinglrnultiplexing circuit 15 and
the terminal selecting/switching/multiplexing circuit 16.
[0036] The plurality of baseband signal inputloutput circuits 1 1-1 to 11 -m
inputloutput input baseband signals, after converting the input baseband
signals into optical or electrical signals as may be necessary (step Sl).
5 [0037] The switching circuit 12 outputs the baseband signals output by the
baseband signal inputloutput circuits 11, to a predetermined output
destination, after converting the baseband signals into optical or electrical
signals as may be necessary (step S2).
[0038] The plurality of wireless inputloutput circuits 13 modulate
10 respective electrical baseband signals output from the switching circuit 12,
at different frequencies, or demodulate wireless modulated signals (step
S 3).
[0039] The plurality of optical input/output circuits 14 modulate respective
optical baseband signals output from the switching circuit 12, at different
15 frequencies, or demodulate optical modulated signals (step S4).
[0040] The frequency selecting/switching/multiplexing circuit 15
multiplexes the wireless modulated signals output from a predetermined
number of circuits of the plurality of wireless inputloutput circuits 13, and
transmits multiplexed signals to a counterpart apparatus via the directional
20 antenna 18 (step S5).
[004 11 The terminal selecting/switching/multiplexing circuit 16
multiplexes the optical modulated signals output by a predetermined
number of circuits of the plurality of optical inputloutput circuits 14, and
transmits multiplexed signals to a counterpart apparatus via a
predetermined optical fiber 19 (step S6).
[0042] As described above, according to the optical/wireless transmission
apparatus, the opticallwireless transmission method and the
optical/wireless transmission system of the present invention, a plurality
of transmission means based on wired and wireless manners can be freely
selected. Moreover, by freely selecting optical wavelengths and wireless
frequencies, limited resources can be effectively utilized. Furthermore,
for example, when the number of optical fibers is limited, the optical fiber
resource in a limited section can be effectively utilized by multiplexing a
5 plurality of optical signals whose wavelengths are different from each
other.
[0043] Furthermore, also in wireless transmission, the resources in a
wireless section can be effectively utilized by transmitting electrical
signals of a plurality of wavelengths via a common antenna after
10 multiplexing the electrical signals. Still further, having the system for
selecting an optimum transmission path and an optimum optical
wavelength/wireless frequency according to the status of the network
enables optimization of optical/wireless transmission resources.
[0044] Next, a program of an optical/wireless transmission method for an
15 optical/wireless transmission apparatus of the present invention will be
described. As illustrated in Fig.2, the optical/wireless transmission
apparatus in the exemplary embodiment of the present invention is
equipped with the program storage unit 20. The program storage unit 20
stores a program of the optical/wireless transmission method illustrated in
20 the flowchart of Fig. 3.
[0045] The control circuit 17 of the optical/wireless transmission
apparatus reads the program from the program storage unit 20, and,
according to the program, controls the baseband signal inputloutput
circuits 1 1, the switching circuit 12, the frequency
25 selecting/switching/multiplexing circuit 15 and the terminal
selecting/switching/multiplexing circuit 16. The description of the
content of the control will be omitted here as it has already been described.
Note that the program stored in the program storage unit 20 includes a
design program for detecting the status of the traffic or the status of the
network and selecting an optimum frequency, path and medium (optical or
radio).
[0046] As described above, according to the present invention, the program
of the optical/wireless transmission method may be obtained which is
5 capable of communicating with a counterpart apparatus by selectively
using the optical transmission and the wireless transmission according to
the counterpart apparatus to communicate with, and selecting an arbitrary
path and an arbitrary frequency from a plurality of frequencies, and,
furthermore, multiplexing signals as may be necessary.
10 [Industrial Applicability]
[0047] It is possible to apply the present invention to a transmission
network that a mobile service provider introduces.
[0048] While the invention has been particularly shown and described with
reference to exemplary embodiments thereof, the invention is not limited
15 to these exemplary embodiments. It will be understood by those of
ordinary skill in the art that various changes in form and details may be
made therein without departing from the spirit and scope of the present
invention as defined by the claims.
[0049] Furthermore, as for the above-described program, various types of
20 non-transitory computer readable media (non-transitory computer readable
medium) can be used to store the program and supply the program to a
computer. The non-transitory computer readable medium includes
various types of tangible recording media (tangible storage medium).
Examples of the non-transitory computer readable medium include
25 magnetic recording medium (for example, a flexible disk, a magnetic tape,
a hard disk drive), magneto-optical recording medium (for example, a
magneto-optical disk), CD-ROM (Read Only Memory) CD-R, CD-RIW,
semiconductor memory (for example, mask ROM, PROM (Programmable
ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access
Memory)). Furthermore, the program may be supplied to a computer by
various types of transitory computer readable media (transitory computer
readable medium). Examples of the transitory computer readable medium
include electrical signals, optical signals, and electromagnetic waves.
5 The transitory computer readable medium can supply the program to a
computer via a wire communication path, such as an electric cable and an
optical fiber, or a wireless communication path.
[0050] This application is based upon and claims the benefit of priority
from Japanese patent application No. 2012-122584, filed on May 30, 2012,
10 the disclosure of which is incorporated herein in its entirety by reference.
[Reference Signs List]
[005 11
1 Opticallwireless transmission apparatus
2 Optical branching apparatus
15 3 to 5 Optical fiber
6 Control system
11 Baseband signal inputloutput circuit
12 Switching circuit
13 Wireless inputloutput circuit
20 14 Optical inputloutput circuit
15 Frequency selectinglswitching/multiplexing circuit
16 Terminal selecting/switching/~nultiplexingc ircuit
17 Control circuit
18 Directional antenna
25 19 Optical fiber
20 Program storage unit

[CLAIMS]
[Claim 1] An optical/wireless transmission apparatus converting a plurality
of input baseband signals into optical or electrical signals as may be
necessary, modulating respective signals at different frequencies,
5 multiplexing a predetermined number of optical modulated signals each
other and a predetermined number of wireless modulated signals each other,
and transmitting an optical multiplexed signal via a predetermined optical
fiber or a wireless multiplexed signal via a directional antenna to a
counterpart apparatus.
10 [Claim 2] The opticallwireless transmission apparatus according to Claim
1, further demultiplexing and demodulating the optical multiplexed signal
and the wireless multiplexed signal sent from the counterpart apparatus,
and converting demodulated baseband signals into optical or electrical
signals as may be necessary.
15 [Claim 3] The opticallwireless transmission apparatus according to Claim
1 or 2, comprising:
a plurality of baseband signal inputloutput circuits that inputloutput
the input baseband signals, after converting the input baseband signals into
optical or electrical signals as may be necessary;
20 a switching circuit that outputs the baseband signals output from
the baseband signal inputloutput circuits, to a predetermined output
destination, after converting the baseband signals into optical or electrical
signals as may be necessary;
a plurality of wireless input/output circuits that modulate
25 respective electrical baseband signals output from the switching circuit, at
different frequencies, or demodulate wireless modulated signals;
a plurality of optical inputloutput circuits that modulate respective
optical baseband signals output from the switching circuit, at' different
frequencies, or demodulate optical modulated signals;
a frequency selecting/switching/multiplexing circuit that
multiplexes wireless modulated signals output from a predetermined
number of circuits of the plurality of wireless inputloutput circuits, to
transmit to the counterpart apparatus via the directional antenna;
5 a terminal selecting/switchinglmultiplexing circuit that multiplexes
optical modulated signals output from a predetermined number of circuits
of the plurality of optical inputloutput circuits, to transmit to the
counterpart apparatus via the predetermined optical fiber; and
a control circuit that carries out frequency selection, and
10 modulation and demodulation by controlling the wireless inputloutput
circuits and the optical inputloutput circuits, and causes optical signals and
wireless signals to be transmitted to an arbitrary path by controlling the
baseband signal inputloutput circuits, the switching circuit, the frequency
selecting/switching/multiplexing circuit and the terminal
15 selecting/switching/multiplexing circuit.
[Claim 4] An optical/wireless transmission method for an opticallwireless
transmission apparatus, comprising an optical/wireless transmission step
of converting a plurality of input baseband signals into optical or electrical
signals as may be necessary, modulating respective signals at different
20 frequencies, multiplexing a predetermined number of optical modulated
signals and a predetermined number of wireless modulated signals, and
transmitting an optical multiplexed signal via a predetermined optical fiber
or a wireless multiplexed signal via a directional antenna to a counterpart
apparatus.
25 [Claim 5] The optical/wireless transmission method according to Claim 4,
further comprising demultiplexing and demodulating the optical
multiplexed signal and the wireless multiplexed signal sent from the
counterpart apparatus, and converting demodulated baseband signals into
optical or electrical signals as may be necessary.
[Claim 6] The optical/wireless transmission method according to Claim 4
or 5 , characterized by comprising:
a plurality of baseband signal inputloutput steps of
inputtingloutputting an input baseband signal after converting the input
5 baseband signal into an optical or electrical signal as may be necessary;
a switching step of outputting the baseband signals output in the
baseband signal inputloutput steps, to a predetermined output destinations,
after converting the baseband signals into optical or electrical signals as
may be necessary;
10 a plurality of wireless inputloutput steps of modulating electrical
baseband signals output in the switching step, at respectively different
frequencies, or demodulating wireless modulated signals;
a plurality of optical inputloutput steps of modulating respective
optical baseband signals output in the switching step, at different
15 frequencies, or demodulating optical modulated signals;
a frequency selecting/switching/multiplexing step of multiplexing
wireless modulated signals output from a predetermined number of circuits
in the plurality of wireless inputloutput steps, to transmit to the
counterpart apparatus via the directional antenna; and
20 a terminal selecting/switching/multiplexing step of multiplexing
optical modulated signals output from a predetermined number of circuits
in the plurality of optical inputloutput steps, to transmit to the counterpart
apparatus via the predetermined optical fiber.
[Claim 7] An optical/wireless transmission system comprising:
25 optical/wireless transmission apparatuses each according to any one of
Claims I to 3; a control system that instructs the opticallwireless
transmission apparatuses in which direction and at which frequency to
transmit an input baseband signal; and an optical branching apparatus that
demultiplexes an optical multiplexed signal output from one of the
optical/wireless transmission apparatuses to output to the other of a
plurality of other optical/wireless transmission apparatuses.
[Claim 8] A non-transitory computer readable medium storing a program
for causing a control circuit of an optical/wireless transmission apparatus
5 to execute
an optical/wireless transmission step of converting a plurality of
input baseband signals into optical or electrical signals as may be
necessary, modulating respective signals at different frequencies,
multiplexing a predetermined number of optical modulated signals and a
10 predetermined number of wireless modulated signals, and transmitting an
optical multiplexed signal via a predetermined optical fiber or a wireless
multiplexed signal via a directional antenna to a counterpart apparatus.