Optical vector signal analyzer based on differential direct detection

Li, J.; Worms, K.; Vorreau, P.; Hillerkuss, D.; Ludwig, Alexandra; Maestle, Ruediger; Schüle, Simone; Hollenbach, Uwe; Mohr, J.; Freude, W.; Leuthold, Juerg

doi:10.1109/leos.2009.5343081

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“…Recently, self-coherent detection (SCD) using delay interferometers (DI) has been suggested as a substitute for coherent reception [2][3][4][5][6][7][8]. The concept extends self-homodyne differential detection of signals such as the differential phase-shift keying (DPSK) modulation format, where phase differences of zero or 180° are conveyed.…”

Section: Introductionmentioning

confidence: 99%

A self-coherent receiver for detection of PolMUX coherent signals

Li¹,

Schmogrow²,

Hillerkuss³

et al. 2012

Opt. Express

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A self-coherent receiver capable of demultiplexing PolMUXsignals without an external polarization controller is presented. Training sequences are introduced to estimate the polarization rotation, and a decision feedback recursive algorithm mitigates the random walk of the recovered field. The concept is tested for a PolMUX-DQPSK modulation format where one polarization carries a normal DQPSK signal while the other polarization is encoded as a progressive phase-shift DQPSK signal. An experimental demonstration of the scheme for a 112 Gbit/s PolMUX-DQPSK signal is presented.

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