### Abstract

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 language | English |
---|---|

Pages (from-to) | 1042-1051 |

Number of pages | 10 |

Journal | IEEE Journal of Quantum Electronics |

Volume | QE-22 |

Issue number | 7 |

Publication status | Published - 1986 Jul |

Externally published | Yes |

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### ASJC Scopus subject areas

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

### Cite this

*IEEE Journal of Quantum Electronics*,

*QE-22*(7), 1042-1051.

**lambda /4-SHIFTED InGaAsP/InP DFB LASERS.** / Utaka, Katsuyuki; Akiba, Shigeyuki; Sakai, Kazuo; Matsushima, Yuichi.

Research output: Contribution to journal › Article

*IEEE Journal of Quantum Electronics*, vol. QE-22, no. 7, pp. 1042-1051.

}

TY - JOUR

T1 - lambda /4-SHIFTED InGaAsP/InP DFB LASERS.

AU - Utaka, Katsuyuki

AU - Akiba, Shigeyuki

AU - Sakai, Kazuo

AU - Matsushima, Yuichi

PY - 1986/7

Y1 - 1986/7

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0022756074&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022756074&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0022756074

VL - QE-22

SP - 1042

EP - 1051

JO - IEEE Journal of Quantum Electronics

JF - IEEE Journal of Quantum Electronics

SN - 0018-9197

IS - 7

ER -