A Low Polarization Sensitivity All-Fiber Wavelength Measurement System

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IEEE Photonics Technology Letters, ISSN: 1041-1135, Vol: 20, Issue: 17, Page: 1464-1466

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Ginu Rajan; Yuliya Semenova; Gerald Farrell; Qian Wang; Pengfei Wang
Institute of Electrical and Electronics Engineers (IEEE); Dublin Institute of Technology
Engineering; Physics and Astronomy; Materials Science; Macro-bend fiber filter polarization-dependent loss (PDL) twisted fiber filter wavelength accuracy; Electrical and Computer Engineering
article description
A low polarization-sensitive all-fiber wavelength measurement system using a twisted macro-bend fiber edge filter together with polarization-insensitive (PI) 3-dB coupler is presented. Eliminating the polarization-dependent loss (PDL) is essential when macro-bending single-mode fiber is utilized as an edge filter. A new bending configuration to eliminate the PDL of a fiber edge filter is proposed in this letter by twisting the fiber by 90° between two bending sections with equal length. The PDL of this configuration retains a low value even while the bending length is increased to achieve a steeper response for the edge filter. This configuration together with a PI 3-dB coupler makes the system to have very low polarization sensitivity and as a result high wavelength accuracy can be achieved. © 2008 IEEE.