Description:FIELD OF INVENTION

[0001]Embodiments of the present invention relate to temperature compensation in optical communication systems and more particularly relate to a computer-implemented system and a computer-implemented method for controlling a delay line interferometer (DLI) to optimize differential phase-shift based quantum key distribution based on a closed feedback loop mechanism.

BACKGROUND

[0002]Optical communication systems transmit data using light signals through optical fibers. The optical communication systems provide high bandwidth, low latency, and immunity to electromagnetic interference, making the optical communication ideal for long-distance communication and high-speed data transmission. Delay line interferometers (DLIs) are optical components in the optical communication systems, particularly in modulation and demodulation processes.
[0003]The DLI splits incoming optical signals into two paths, introduces a controlled delay in one of the paths, and then recombine the delayed and non-delay , Claims:CLAIMS
I/WE CLAIM:
1. A computer-implemented method (500) for controlling a delay line interferometer (DLI) (104) to optimize differential phase-shift based quantum key distribution based on a closed feedback loop mechanism, the computer-implemented method (500) comprising:
determining (502), by one or more hardware processors (106), an average bit error rate, wherein the average bit error rate is determined by at least one of:
comparing (504), by the one or more hardware processors (106), a subset of one or more detected bits with one or more transmitted bits at the delay line interferometer (DLI) (104) to determine an estimated bit error rate, during each cycle of delay line interferometer (DLI) (104) operations; and
evaluating (506), by the one or more hardware processors (106), an average of N cycles of the estimated bit error rate to determine the average bit error rate;
setting (508), by the one or more hardware processors (106), the average bit error rate as a base bit error rate during an initial de