Direct detection of closely spaced optical FM-FDM Gb/s microwave PSK signals

Author

Way, W.I. ; Lo, Y.H. ; Lee, T.P. ; Lin, C.

Author_Institution

Bellcore, Red Bank, NJ, USA

Volume

3

Issue

2

fYear

1991

Firstpage

176

Lastpage

178

Abstract

A modulation scheme combining microwave phase-shift-keyed (PSK) and optical frequency modulation (FM) techniques is used in a two-channel optical frequency-division-multiplexed (FDM) system. Optical filtering and FM demodulation are carried out by a tunable fiber Fabry-Perot etalon. A transmission rate of 2 Gb/s and a channel spacing of less than 30 GHz are achieved with a crosstalk level of about -25 dB. This work shows that the modulation technique of combining optical FM/FDM and RF/microwave subcarrier multiplexing is transparent to either digital or analog signals. The modulation technique not only avoids the low-frequency nonuniform FM response problem, but also facilitates close optical channel spacing.<>

Keywords

frequency division multiplexing; frequency modulation; optical links; optical modulation; phase shift keying; signal detection; 2 Gbit/s; FM demodulation; RF/microwave subcarrier multiplexing; channel spacing; close optical channel spacing; crosstalk level; direct detection; microwave PSK signals; optical filtering; optical frequency modulation; transmission rate; tunable fiber Fabry-Perot etalon; two channel optical FDM system; Channel spacing; Frequency division multiplexing; Frequency modulation; Microwave filters; Microwave theory and techniques; Optical crosstalk; Optical filters; Optical modulation; Phase modulation; Phase shift keying;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.76881

Filename

76881