Role of thermal chirp in reducing interferometric noise in fiber-optic systems driven by directly modulated DFB lasers

W. D. Cornwell, Ivan Andonovic, A. Zadok, Moshe Tur

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The presence of relatively short time constants (<20 nS) in the impulse response of the thermal chirp of directly modulated DFB lasers is shown to significantly reduce the deleterious effects of interferometric noise in fiber-optic systems with multi-paths. Compared with the chirp-free case of external modulation, thermal chirp can improve crosstalk tolerance by as much as 5 dB for eight interferers at 622 Mb/s and 13 dB at 80 Mb/s. This improvement was studied both theoretically and experimentally for several lasers. Simulations results match the experimental data, while two simplified semi-analytical models provide qualitative description.

Original languageEnglish
Pages (from-to)154-160
Number of pages7
JournalJournal of Lightwave Technology
Volume18
Issue number2
DOIs
StatePublished - Feb 2000
Externally publishedYes

Bibliographical note

Funding Information:
Manuscript received June 18, 1999; revised November 1, 1999. This work was supported in part by the U.K./Israel Science and Technology Research Fund. W. D. Cornwell and I. Andonovic are with the Department of Electronic and Electrical Engineering, Strathclyde University, Royal College Building, Glasgow G1 1XW, U.K. A. Zadok and M. Tur are with the Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel. Publisher Item Identifier S 0733-8724(00)01316-5.

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