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We propose a straightforward algorithm to estimate second-order PMD from adaptive FIR-filter tap coefficients in a digital coherent optical receiver. The novel algorithm is verified with 100-Gbit/s dual-polarization QPSK experiments.
We describe optoelectronic signal procesing based on LiNbO3 modulators. Using such schemes, we demonstrate ultrafast functions of time-division demultiplexing and clock recovery, which are applicable to 160-Gbit/s systems.
The digital coherent receiver, which is a combination of a phase-diversity optical homodyne receiver and digital signal processing (DSP), can demodulate any multilevel coded optical signals without relying upon an optical phase-locked loop. However, the maximum symbol rate processed by such a receiver is limited by the speed of electric analog-to-digital converters and digital signal processors. Although...
Optical time-division demultiplexing of 160-Gbit/s optical signals is demonstrated by using a 2-m-long dispersion-shifted Bi2O3-based photonic crystal fiber. Power penalties are less than 6 dB for all 10-Gbit/s tributaries.
We propose a novel method of suppressing the in-band ASE noise from optical amplifiers by means of the spectral spread technique. The receiver-sensitivity improvement of 1.5 dB is demonstrated experimentally by using our scheme.
We demonstrate an all fiber-based OTDM receiver incorporating clock recovery and demultiplexing functions using short lengths of bismuth oxide-based nonlinear fiber and erbium-doped bismuth oxide fiber. Error-free, overall operation is achieved at 80 Gbit/s and the clock recovery is also shown to be operable at 160 Gbit/s.
We propose a simple optoelectronic time-division demultiplexer based on selective spectral shift and spectral filtering, with which good demultiplexing characteristics are confirmed at 40 Gbit/s.
Using the newly developed eye-construction algorithm, we demonstrate a cost-effective all-optical sampling system, incorporating a free-running sampling pulse source. Polarization-insensitive eye-diagram construction of 160-Gb/s signals is realized at 0.3 sec/scan in the entire C band
We investigated wavelength conversion characteristics of 160 GHz pulse train in a wavelength converter based on four-wave mixing using highly nonlinear fiber. We observed modulation instability causes OSNR to degrade while conversion efficiency rapidly increases.
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