FSK heterodyne transmission experiments at 560 Mbit/s and 1 Gbit/s

Author

Vodhanel, R.S. ; Gimlett, J.L. ; Cheung, Nim ; Tsuji, S.

Author_Institution

Bell Communications Research, Inc., Red Bank, NJ, USA

Volume

5

Issue

4

fYear

1987

fDate

4/1/1987 12:00:00 AM

Firstpage

461

Lastpage

468

Abstract

Optical frequency-shift-keying (FSK) signals are obtained from directly modulated distributed feedback (DFB) semiconductor lasers. Experimental studies of the direct frequency modulation (FM) characteristics of the DFB lasers show a nonuniform FM response due to the competing effects of thermal modulation of the laser active region and carrier density modulation. Equalization of the signal current to the laser is employed to produce a flat FM response from 30 kHz to 1 GHz. Optical FSK transmission and heterodyne detection experiments at 560-Mbit/s and 1-Gbit/s are conducted at a wavelength of 1497 nm. Receiver sensitivities of -39 dBm at 560 Mbit/s and -37 dBm at 1 Gbit/s are obtained. Transmission through 100 km of single-mode fiber at 1 Gbit/s is achieved with no degradation in receiver sensitivity.

Keywords

Frequency-shift keying; Heterodyning; Optical fiber communication; Distributed feedback devices; Frequency modulation; Frequency shift keying; Laser feedback; Optical feedback; Optical mixing; Optical modulation; Optical receivers; Optical sensors; Semiconductor lasers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.1987.1075525

Filename

1075525