1. 5- mu M lambda /4-SHIFTED INGAASP/INP DFB LASERS.

Shigeyuki Akiba, Masashi Usami, Katsuyuki Utaka

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Abstract

A single-wavelength light source in the 1. 5- mu m range was developed using InGaAsP/InP lambda /4-shifted distributed feedback (DFB) semiconductor heterostructures. Superiority of the lambda /4-shifted DFB structure in terms of stability of the main mode at the Bragg wavelength was shown theoretically. The threshold, the output, and the polarization characteristics were taken into account. A lambda /4-shifted corrugated grating was made by a recently developed negative and positive photoresists technique. Buried heterostructure (BH) diode lasers with nonreflective window ends were fabricated and highly stable single-mode operation with a low threshold was obtained reproducibly. Direct modulation properties and life-tests results indicated that the lambda /4-shifted DFB lasers could be a reliable single-mode light source in a long-span lightwave transmission system in the 1. 5- mu m range.

Original languageEnglish
Pages (from-to)1564-1573
Number of pages10
JournalJournal of Lightwave Technology
VolumeLT-5
Issue number11
Publication statusPublished - 1987
Externally publishedYes

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics

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