ASYMMETRIC lambda /4-SHIFTED InGaAsP/InP DFB LASERS.

Masashi Usami, Shigeyuki Akiba, Katsuyuki Utaka

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

1. 5- mu m asymmetric lambda /4-shifted InGaAsP/InP DFB (distributed feedback) lasers in which the lambda /4-shift position was moved from the center of the DFB region toward the front side were made in order to obtain higher output power with high single-longitudinal-mode (SLM) yield. Statistical measurements showed that for an increase of the differential quantum efficiency from the front facet without a noticeable decrease of the SLM yield, the lambda /4-shift position should be moved toward the front facet by 10-15% of the total DFB length. The output efficiencies of diodes with AR coatings on the window structure were almost coincident to those expected from theoretical calculations. The main-to-submode ratio P//0/P//1 in the rear spectra of the asymmetric devices noticeably decreased with increasing asymmetry. From an experimental point of view, a criterion for stable SLM operation, for example, P//0/P//1 greater than equivalent to 1. 5 in the rear spectrum at I equals 0. 9I//t//h for the lambda /4-shift position l//f:l//r equals 35:65, is presented.

Original languageEnglish
Pages (from-to)815-821
Number of pages7
JournalIEEE Journal of Quantum Electronics
VolumeQE-23
Issue number6
Publication statusPublished - 1987 Jun
Externally publishedYes

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Feedback
Distributed feedback lasers
flat surfaces
shift
Quantum efficiency
Diodes
output
distributed feedback lasers
Coatings
quantum efficiency
diodes
asymmetry
coatings

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

ASYMMETRIC lambda /4-SHIFTED InGaAsP/InP DFB LASERS. / Usami, Masashi; Akiba, Shigeyuki; Utaka, Katsuyuki.

In: IEEE Journal of Quantum Electronics, Vol. QE-23, No. 6, 06.1987, p. 815-821.

Research output: Contribution to journalArticle

Usami, Masashi ; Akiba, Shigeyuki ; Utaka, Katsuyuki. / ASYMMETRIC lambda /4-SHIFTED InGaAsP/InP DFB LASERS. In: IEEE Journal of Quantum Electronics. 1987 ; Vol. QE-23, No. 6. pp. 815-821.
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