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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1990),
  • paper CWD3

Broadband balanced receiver using a twin PIN/HEMT front end and a glass waveguide coupler in a 4-Gbit/s CP-FSK system

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Abstract

A dual detector balanced optical receiver (DBOR), which has two photodetectors in a balanced mixer configuration, is commonly used as a coherent receiver. The DBOR has two advantages: the effective use of local laser power and common-mode rejection. The latter feature is useful in suppressing the local laser relative intensity noise, immunity to dc drift in a homodyne receiver, and suppression of baseband modulation and signal-cross-signal interference in a multichannel transmission. The common-mode rejection characteristics are restricted by the difference in length and amplitude ratio of two paths from the coupling region of coupler to photodetectors. To achieve a high common-mode rejection, we used a monolithically integrated twin PIN1 and a 3-dB glass waveguide coupler (made by Nippon Sheet Glass Co.).

© 1990 Optical Society of America

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