2 × 10 Gbit/s quaternary intensity modulation generation using an optical QPSK modulator

Selwan K. Ibrahim; Suhas Bhandare; Hongbin Zhang; Reinhold Noé

doi:10.1117/12.636759

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8 December 2005 2 × 10 Gbit/s quaternary intensity modulation generation using an optical QPSK modulator

Selwan K. Ibrahim, Suhas Bhandare, Hongbin Zhang, Reinhold Noé

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Proceedings Volume 6021, Optical Transmission, Switching, and Subsystems III; 602119 (2005) https://doi.org/10.1117/12.636759
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

Two 2x10 Gbit/s quaternary intensity modulation signals (4-IM) can be generated using quadrature amplitude modulation (QAM), with unequal modulation amplitudes in two orthogonal quadratures. Two 10 Gbit/s NRZ ASK signals and a QPSK modulator allow to generate 4-IM with the same bandwidth as an NRZ-ASK signal. Measured sensitivity at a BER of 10^-9 and chromatic dispersion (CD) tolerance are -21.2 dBm and ~ +130 ps/nm, respectively. Two duobinary 10 Gbit/s data streams and a QPSK modulator allow to generate a 9-point QAM signal, with the same bandwidth as a duobinary signal. A stub filter with a frequency response dip at 5 GHz was used to generate the duobinary signals. Detected as a 4-IM, this scheme features a sensitivity and a CD tolerance of -21 dBm and ~ +140 ps/nm, respectively. A polarization and phase insensitive direct detection receiver with a single photodiode has been used to detect all generated QAM signals as 4-IM signals.

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Selwan K. Ibrahim, Suhas Bhandare, Hongbin Zhang, and Reinhold Noé "2 × 10 Gbit/s quaternary intensity modulation generation using an optical QPSK modulator", Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 602119 (8 December 2005); https://doi.org/10.1117/12.636759

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