Evaluation of 4-Gbit/s optical fiber transmission distance with direct and external modulation

Author

Okiyama, Tadashi ; Nishimoto, Hiroshi ; Yokota, Izumi ; Touge, Takashi

Author_Institution

Fujitsu Lab. Ltd., Kawasaki, Japan

Volume

6

Issue

11

fYear

1988

fDate

11/1/1988 12:00:00 AM

Firstpage

1686

Lastpage

1692

Abstract

Transmission characteristics for a recently modulated measured distributed-feedbacked (DFB) laser and an externally modulated DFB laser using a Ti:LiNbO₃, Mach-Zehnder modulator at 4 Gb/s are discussed. The transmission characteristics are estimated by an advanced eye-pattern analysis method. The maximum measured fiber dispersion with a directly modulated laser is 100 to 140 ps/nm when the chirp power penalty is 1 dB. However, for external modulation, there is no power penalty after transmission over a 2220-ps/nm dispersive fiber. This confirms that external modulation has superior transmission characteristics. The modulation scheme for 4-Gb/s systems in terms of these results is discussed.

Keywords

digital communication systems; distributed feedback lasers; optical dispersion; optical fibres; optical links; optical modulation; 4 Gbit/s; DFB laser; LiNbO₃:Ti; Mach-Zehnder modulator; direct modulation; distributed feedback laser; external modulation; eye-pattern analysis; fiber dispersion; optical fiber transmission distance; Chirp modulation; Fiber lasers; Integrated circuit noise; Laser modes; Optical fiber communication; Optical fiber dispersion; Optical fibers; Optical modulation; Optical receivers; Power lasers; Power measurement; Preamplifiers;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.9985

Filename

9985