Add/drop channel filter based on fiber-Bragg-grating-assisted coupler fabricated by asymmetric fused taper technology

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Abstract
All-fiber add/drop filter based on fiber-Bragg-grating (FBG) assisted coupler is compact and non-interferometric, which reduces the device's sensitivity to the grating position. By introducing the grating refractive modulation into the evanescent field coupling, the coupled-mode equation of FBG-assisted coupler is obtained and the influences of fiber mismatch on the filter spectra is investigated thoroughly. And a high-quality FBG-assisted filter is achieved by adjusting fiber structure parameters using asymmetric fused taper technology. The experimentally measured results are in good agreement with the numerical calculations.

Keywords:
fiber bragg grating (FBG) /

fiber coupler /

add/drop channel filter /

pre-drawing fused taper
Authors and contacts
Dong Xiao-Wei,

Pei-Li,

Jian Shui-Sheng

1.
北京交通大学光波技术研究所，北京 100044
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