Detailed dynamic model for semiconductor optical amplifiers and their crosstalk and intermodulation distortion

Author

Durhuus, Terji ; Mikkelsen, Benny ; Stubkjaer, Kristian E.

Author_Institution

Electromagn. Inst., Tech. Univ. of Denmark, Lyngby, Denmark

Volume

10

Issue

8

fYear

1992

fDate

8/1/1992 12:00:00 AM

Firstpage

1056

Lastpage

1065

Abstract

An advanced dynamic model for multisection semiconductor optical amplifiers is presented. It accounts for the carrier and field distributions in the longitudinal direction as well as for the facet reflectivities. The model can handle arbitrary time-varying input signals and current modulations. The model is used to assess intermodulation distortion and crosstalk. Cascaded amplifiers are considered, and the crosstalk and intermodulation distortion due to cascaded amplifiers are found to accumulate by adding together in amplitude; this may limit the number or cascaded amplifiers in multichannel systems. Carrier-induced nonlinearities depend strongly on facet reflectivities; for 25 dB of single-pass gain, a reflectivity of 5×10^-4 will result in 3 dB excess distortion. Reduction of intermodulation distortion by use of multisection amplifiers is found to be possible only for small channel separations (<300 MHz). Simulations of 11-channel amplification showed a reduction of 13 dB in intermodulation distortion when random-phase optical carriers are applied

Keywords

crosstalk; frequency division multiplexing; intermodulation; optical communication equipment; optical modulation; semiconductor junction lasers; cascaded amplifiers; crosstalk; current modulations; dynamic model; excess distortion; facet reflectivities; field distributions; intermodulation distortion; longitudinal direction; multichannel systems; multisection amplifiers; random-phase optical carriers; semiconductor optical amplifiers; single-pass gain; time-varying input signals; Charge carrier density; Intermodulation distortion; Numerical models; Optical amplifiers; Optical bistability; Optical crosstalk; Optical distortion; Reflectivity; Semiconductor optical amplifiers; Stimulated emission;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.156845

Filename

156845