Intermodulation and harmonic distortions of laser diodes with optical feedback

Author

Helms, Jochen

Author_Institution

Inst. fuer Hochfrequenztech., Tech. Univ. Berlin, Germany

Volume

9

Issue

11

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

1567

Lastpage

1575

Abstract

Analytical expressions for the second-order harmonic and the third-order intermodulation distortions of laser diodes with optical feedback are derived. It is shown theoretically and experimentally that optical feedback from the transmission fiber considerably enhances intermodulation and harmonic distortions of laser diodes. Third-order intermodulation distortions up to -15 dBc must be expected for two-tone modulation and low-intensity modulation indexes m≈7% per carrier, which affects the performance of subcarrier multiplexed (SCM) communication systems. To avoid additional distortions the external feedback level must be two orders of magnitudes lower than the critical external feedback level of the laser diode

Keywords

feedback; intermodulation; laser theory; optical communication equipment; optical modulation; semiconductor junction lasers; DFB laser diode; analytical expressions; external feedback level; laser diodes; low-intensity modulation indexes; optical feedback; second-order harmonic; third-order intermodulation distortions; transmission fiber; two-tone modulation; Charge carrier density; Diode lasers; Equations; Frequency; Harmonic analysis; Harmonic distortion; Intermodulation distortion; Laser feedback; Optical distortion; Optical feedback;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.97648

Filename

97648