Compensation of polarization-dependent loss in transmission fiber gratings by use of a Sagnac loop interferometer.
We analyze the transmission characteristics of a Sagnac loop interferometer containing a polarization-dependent loss element and lossless polarization-converting elements by use of Jones matrices. We show that polarization independence in the transmission mode can be achieved in such a configuration and that maximum transmittance occurs when a half-wave plate is used for the polarization-converting element. The result is verified experimentally for a fiber acousto-optic tunable filter and cascaded long-period fiber gratings with either intrinsic or process-induced polarization-dependent filtering characteristics.
Kim
Chang-Seok
CS
Beckman Laser Institute, University of California, Irvine, Irvine, California 92612, USA. cskim@laser.bli.uci.edu
Choi
Bernard
B
Nelson
J Stuart
JS
Li
Qun
Q
Dashti
Pedram Zare
PZ
Lee
H P
HP
D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D007089:Image Enhancement / Q000295:instrumentation* / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008857:Microscopy, Interference / Q000295:instrumentation* / Q000379:methods*; D008859:Microscopy, Polarization / Q000295:instrumentation* / Q000379:methods