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Proceedings Paper

Experimental and numerical determination of crosstalk in a coherent optical multichannel receiver
Author(s): Martin A. Schreiblehner; Michael M. Rasztovits-Wiech; Walter R. Leeb; Arpad L. Scholtz
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Paper Abstract

We developed a multichannel receiver concept for densely packed optical channels which are to be demodulated simultaneously. In each channel, the input is a binary phase modulated optical signal of approximately the same optical power. For experimental verification of the concept we designed, realized and tested a dualchannel system working at 2 X 8.45 Mbit/s, employing DPSK modulation of Nd:YAG ring lasers at 1.064 micrometers . In the transmitter, the channel distance is set by means of a synthesizer-stabilized optical PLL. In the receiver, a balanced frontend based on a polarization-preserving fiber directional coupler, InGaAs photodiodes, and a 5 mW local laser oscillator transposes the optical input channels to a first intermediate frequency. To achieve good channel separation and reliable simultaneous demodulation, conversion to a second and third intermediate frequency is implemented. If only one channel carries information, a sensitivity of 3.2 dB above the shot noise limit is achieved. The crosstalk penalty depends on the optical channel distance, on the channel selection filter, and the post-detection filter. The power penalty due to crosstalk is investigated experimentally and is compared with theoretically predicted results. For a channel distance of twice the data rate a crosstalk penalty of less than 2 dB is achieved.

Paper Details

Date Published: 20 April 1995
PDF: 10 pages
Proc. SPIE 2381, Free-Space Laser Communication Technologies VII, (20 April 1995); doi: 10.1117/12.207416
Show Author Affiliations
Martin A. Schreiblehner, Technische Univ. Wien (Austria)
Michael M. Rasztovits-Wiech, Technische Univ. Wien (Austria)
Walter R. Leeb, Technische Univ. Wien (Austria)
Arpad L. Scholtz, Technische Univ. Wien (Austria)

Published in SPIE Proceedings Vol. 2381:
Free-Space Laser Communication Technologies VII
G. Stephen Mecherle, Editor(s)

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