Pseudo slant fiber bragg grating, multiple series fiber bragg grating, optical fiber type coupler and optical connector
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United States of America Patent
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Issued Date -
Mar 30, 2006
app pub date -
Aug 21, 2003
filing date -
Aug 22, 2002
priority date (Note) -
Abandoned
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Abstract
An optical fiber 4 having a clad diameter of 125 .mu.m is made by adding Ge to a core 41 having a core diameter of 8 .mu.m and a relative refractive index difference of 0.3 %, and two refractive index grating portions 41a and 41b having a slant angle of 2.degree. are formed in series in the optical fiber 4 by a phase mask method using KrF excimer laser (.lamda.=248 nm). The central period (2.LAMBDA.) of the phase mask of a chirped grating is 1,140 nm, the chip rate (C) of the period is 1.2 nm/mm, the length (G) of the first and second index grating portions 41a and 41b is 8 mm, the effective refractive index of the first and second index grating portions 41a and 41b is 1.447, the refractive index modulation is 3.times.10.sup.-3, and the gap between the first and second index grating portions 41a and 41b is 1 mm.
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