Wavelength-tunable duplex integrated light source

Hiroshi Okamoto, Hiroshi Yasaka, K. Oe

Research output: Chapter in Book/Report/Conference proceedingConference contribution


A monolithically integrated opto-electronic device is proposed as a fast wavelength-switching light source. This tunable duplex integrated light source comprises two wavelength-tunable distributed Bragg reflector (DBR) laser diodes (LDs), two MQW-electro-absorption optical switches, a Y-shaped waveguide coupler, a MQW-electro-absorption modulator, and two thermal drift compensators (TDCs). The wavelength-switching time of the optical switches was estimated to be 60 ps including a 50-ps rise time for the electrical-pulse generator. The wavelength of a 10-Gbit/s NRZ-modulated optical signal can be switched without bit loss. The function of the TDCs is to keep the device-chip temperature constant. Thermal-transient- induced wavelength drift with a millisecond-order time constant, which has been reported for DBR-LDs, and thermal crosstalk between the tuning regions of the integrated LDs, which causes wavelength fluctuation, are effectively suppressed by thermal-drift-compensation operation using the TDCs.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsPaul A. Morton, Deborah L. Crawford
Number of pages9
Publication statusPublished - 1996 Jan 1
Externally publishedYes
EventHigh-Speed Semiconductor Laser Sources - San Jose, CA, USA
Duration: 1996 Feb 11996 Feb 2


OtherHigh-Speed Semiconductor Laser Sources
CitySan Jose, CA, USA

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


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