Effect of Mirror Facets on Lasing Characteristics of Distributed Feedback InGaAsP/lnP Laser Diodes at 1.5 μm Range

Katsuyuki Utaka, Shigeyuki Akiba, Kazuo Sakai, Yuichi Matsushima

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

The effect of mirror facets on lasing properties of distributed feedback (DFB) InGaAsP/lnP laser diodes was studied theoretically and experimentally. A DFB laser with a window region was found to be suitable to examine the effect of mirror facets. The effective reflectivity of a window structure was calculated to be very small, typically as small as 0.03 percent for a few tens of micrometers of the window region. These small effective reflectivities were experimentally confirmed. Three kinds of DFB lasers, i.e., a double-window (DW), a single-window (SW), and a Fabry-Perot (FP), were discussed. Two modes with a separation corresponding to a so-called stopband appeared in a DW-DFB laser, in which almost no reflection at both ends was estimated. On the other hand, the threshold and the resonant wavelength of an SW- and an FP-DFB laser were found to be sensitive to the phases of corrugation at the facets. It turned out, however, that the mirror facet contributed to the single-mode operation due to an asymmetric resonant spectrum and to the reduction in the threshold. Although a low-threshold-current FP-DFB laser was experimentally obtained, the coincidence between the gain peak and the Bragg wavelengths was essential in this type. The SW-DFB laser seemed the most promising among the three types in terms of the stability of the singlemode operation.

Original languageEnglish
Pages (from-to)236-245
Number of pages10
JournalIEEE Journal of Quantum Electronics
Volume20
Issue number3
DOIs
Publication statusPublished - 1984 Mar
Externally publishedYes

ASJC Scopus subject areas

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

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