An optical fiber comprising a high concentration germanium layer (1) which is disposed at a central position of the optical fiber and contains germanium oxide in a concentration of at least 0 1% by weight, relative to the total weight of the high concentration germanium layer, and a low concentration germanium layer (2) which is disposed around the high concentration germanium layer and contains germanium oxide in a concentration of less than 0 1% by weight, relative to the total weight of the low concentration germanium layer, characterized in that the ratio of optical power leaking from the high concentration germanium layer (1) to the low concentration germanium layer (2) in an employed wavelength band is not more than 0 4% relative to the total optical power propagating through the optical fiber.

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#	Name	Date
1	00513-cal-2001-priority document others.pdf	2011-10-06
2	00513-cal-2001-gpa.pdf	2011-10-06
3	00513-cal-2001-form-5.pdf	2011-10-06
4	00513-cal-2001-form-3.pdf	2011-10-06
5	00513-cal-2001-form-2.pdf	2011-10-06
6	00513-cal-2001-form-18.pdf	2011-10-06
7	00513-cal-2001-form-1.pdf	2011-10-06
8	00513-cal-2001-drawings.pdf	2011-10-06
9	00513-cal-2001-description(complete).pdf	2011-10-06
10	00513-cal-2001-correspondence.pdf	2011-10-06
11	00513-cal-2001-claims.pdf	2011-10-06
12	00513-cal-2001-abstract.pdf	2011-10-06
13	513-CAL-2001-FORM-27.pdf	2012-07-18
14	513-CAL-2001-(18-03-2013)-FORM-27.pdf	2013-03-18
15	513-CAL-2001-(28-03-2016)-FORM-27.pdf	2016-03-28
16	Form 27 [27-03-2017(online)].pdf	2017-03-27
17	513-CAL-2001-RELEVANT DOCUMENTS [27-02-2018(online)].pdf	2018-02-27
18	513-CAL-2001-RELEVANT DOCUMENTS [15-03-2019(online)].pdf	2019-03-15
19	513-CAL-2001-RELEVANT DOCUMENTS [07-03-2020(online)].pdf	2020-03-07
20	513-CAL-2001-RELEVANT DOCUMENTS [26-07-2021(online)].pdf	2021-07-26
21	513-CAL-2001-RELEVANT DOCUMENTS [23-09-2022(online)].pdf	2022-09-23

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