Monolithically-integrated multi-wavelength laser with optical feedback: damped relaxation oscillation dynamics and narrowed linewidth

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Abstract

An InP-based, monolithically integrated multiwavelength laser with optical feedback is presented. We demonstrate the performance of the dual-wavelength operation. Single-mode lasing is obtained for each of the two channels within a temperature range from 16 to $30$ °C and an injection current range from 30 to 70 mA without mode-hopping. This is due to the combined filtering functions of an arrayed waveguide grating and a distributed Bragg reflector. A method that makes use of weak optical feedback is demonstrated to improve the stability of each single-mode. With this method, sustained relaxation oscillations that are excited by on-chip parasitic reflections are damped and linewidths in both channels are narrowed to around 400 kHz compared to the linewidth of 1 MHz that is obtained when no feedback is applied. The suppression ratio of the relaxation-oscillation-induced side peaks is measured to be over 45 dB for two simultaneously operated channels.

Original languageEnglish
Article number8493272
Number of pages8
JournalIEEE Photonics Journal
Volume10
Issue number6
DOIs
Publication statusPublished - Dec 2018

Keywords

  • arrayed waveguide grating
  • Arrayed waveguide gratings
  • distributed Bragg reflector
  • Laser feedback
  • Laser modes
  • linewidth
  • Optical feedback
  • optical feedback
  • Pump lasers
  • relaxation oscillation
  • Semiconductor laser
  • Semiconductor lasers
  • singlemode
  • Linewidth
  • Single-mode
  • Relaxation oscillation
  • Distributed Bragg reflector
  • Arrayed waveguide grating

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