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Compensation of polarization-dependent loss in transmission fiber gratings by use of a Sagnac loop interferometer.

  • Author(s): Kim, Chang-Seok
  • Choi, Bernard
  • Nelson, J Stuart
  • Li, Qun
  • Dashti, Pedram Zare
  • Lee, HP
  • et al.
Abstract

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.

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