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We propose a polarization-independent PSA with a novel polarization-diversity loop configuration using highly efficient PPLN waveguides. Polarization-independent error-free operation for a 40-Gbit/s DQPSK signal and phase-regenerative amplification for an 80-Gbit/s PDM-QPSK signal with artificial phase noise were successfully demonstrated.
We review the capabilities of phase sensitive amplifiers based on PPLN waveguides for optical communication. Specifically, we discuss their unique low noise amplification, phase and amplitude regeneration in multi-span transmissions, and multilevel phase coding signal amplification.
We describe a fiber line testing technique for PON that uses backscattered light reflected at FBGs with several wavelengths and a TLS-OTDR. We demonstrate the ability to test 8-branched fibers individually.
We describe a fiber line testing technique for PON that uses backscattered light reflected on FBGs with several wavelengths and a TLS-OTDR. We demonstrate the ability to test 8-branched fibers individually.
KTa x Nb 1−x O 3 (KTN) is a promising material for optical devices because of its large electro-optic (EO) effect. Recently, we reported a 2×2 Mach–Zehnder interferometer (MZI)-type EO switch consisting of a single-crystalline KTN waveguide. The development of this switch involved two important breakthroughs in relation to the crystal growth process, namely the successful...
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