Katsuyuki Utaka, Shigeyuki Akiba, Kazuo Sakai, Yuichi Matsushima

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The effects of reflectivities at the end of the distributed-feedback (DFB) region and of a lambda /4-shift position are compared theoretically in terms of stability of single-longitudinal-mode operation and asymmetric power distribution. The shift of the lambda /4-shift position from the center to a certain place in the DFB region, with the end reflectivities less than several tenths of a percent, is most effective for efficient power extraction and reproducible dynamic-single-mode (DSM) operation. Devices emitting at 1. 5 mu m range were fabricated by using negative and positive photoresists and using one-step holographic exposure. They exhibited single-longitudinal-mode operations just at or near the center of the stopband, i. e. , the Bragg wavelength. Slight wavelength deviations from the center are attributed to the accidental variations of phase shift from the optimal value.

Original languageEnglish
Pages (from-to)1042-1051
Number of pages10
JournalIEEE Journal of Quantum Electronics
Issue number7
Publication statusPublished - 1986 Jul
Externally publishedYes


ASJC Scopus subject areas

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

Cite this

Utaka, K., Akiba, S., Sakai, K., & Matsushima, Y. (1986). lambda /4-SHIFTED InGaAsP/InP DFB LASERS. IEEE Journal of Quantum Electronics, QE-22(7), 1042-1051.