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A GaAs FET-IC mixer achieving high receiver sensitivity for coherent optical heterodyne detection at 2.5 Gb/s

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3 Author(s)
Fushimi, Hiroshi ; NTT Transmission Syst. Lab., Kanagawa, Japan ; Ohkawa, N. ; Fujita, S.

A FET-IC mixer that uses a Gilbert-cell multiplier with a single-to-balance conversion input buffer is proposed. The key point in the FET-IC mixer design is that a single-to-balance conversion input buffer is used to improve the amplitude and phase balance of signals output from the input buffer stage. Excellent squaring characteristics were achieved in the range from 0 to -25 dBm. The FET-IC mixer was successfully tested in a 2.5 Gb/s CPFSK demodulator for optical heterodyne reception. Compared to the best diode passive double-balanced diode mixers, receiver sensitivity was improved by 1 dB at +10 dBm electrical input power. Very small degradation in receiver sensitivity, less than 3 dB, was achieved at electrical input power levels ranging from +10 to -10 dBm.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 11 )