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

Author

Fushimi, Hiroshi ; Ohkawa, Norio ; Fujita, Shuichi

Author_Institution

NTT Transmission Syst. Lab., Kanagawa, Japan

Volume

3

Issue

11

fYear

1991

Firstpage

1015

Lastpage

1018

Abstract

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.<>

Keywords

III-V semiconductors; field effect integrated circuits; frequency shift keying; gallium arsenide; integrated optoelectronics; mixers (circuits); optical communication equipment; receivers; 2.5 Gbit/s; CPFSK demodulator; GaAs; GaAs FET-IC mixer; Gilbert-cell multiplier; III-V semiconductor; amplitude balance; coherent optical heterodyne detection; electrical input power; high receiver sensitivity; phase balance; receiver sensitivity; single-to-balance conversion input buffer; squaring characteristics; Demodulation; Diodes; Gallium arsenide; Optical buffering; Optical detectors; Optical mixing; Optical receivers; Optical sensors; Signal design; Testing;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.97846

Filename

97846