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Proceedings Paper

2 × 10 Gbit/s quaternary intensity modulation generation using an optical QPSK modulator
Author(s): Selwan K. Ibrahim; Suhas Bhandare; Hongbin Zhang; Reinhold Noé
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Paper 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.

Paper Details

Date Published: 8 December 2005
PDF: 8 pages
Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 602119 (8 December 2005); doi: 10.1117/12.636759
Show Author Affiliations
Selwan K. Ibrahim, Univ. Paderborn (Germany)
Suhas Bhandare, Univ. Paderborn (Germany)
Hongbin Zhang, Univ. Paderborn (Germany)
Reinhold Noé, Univ. Paderborn (Germany)

Published in SPIE Proceedings Vol. 6021:
Optical Transmission, Switching, and Subsystems III
Rodney S. Tucker; Dominique Chiaroni; Wanyi Gu; Ken-ichi Kitayama, Editor(s)

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