Measurement of Gain Saturation Coefficient of a DFB Laser for Lasing Mode Control by Orthogonal Polarization Light

Hiroshi Yasaka, Yuzo Yoshikuni, Masahiko Watanabe

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Frequency response of a 1.55 μm distributed feedback (DFB) laser is measured by injecting light which has the orthogonal polarization to the laser’s lasing mode. The injected light, here we call it as orthogonal polarization light, is carefully selected not to couple to the lasing mode by adjusting its polarization to be orthogonal to that of the lasing mode and by setting its wavelength slightly different from that of the lasing mode. The wavelength of the orthogonal polarization light, however, is set within the range where the laser’s active layer has a gain. The gain saturation coefficients of a distributed feedback (DFB) laser are estimated from the measurement and numerical analysis. The gain saturation coefficients for the lasing light is estimated to be 4.7 × 10-23 cm2 and that by the injected orthogonal polarization light (almost same wavelength as lasing mode) is 3.7 × 10-23 cm2, respectively. The resonant peak intensity and the resonant frequency show almost same behaviors as those in injection current modulation.

Original languageEnglish
Pages (from-to)2248-2255
Number of pages8
JournalIEEE Journal of Quantum Electronics
Volume27
Issue number10
DOIs
Publication statusPublished - 1991 Oct
Externally publishedYes

ASJC Scopus subject areas

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

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