A Semiconductor Laser with Flat Frequency Response up to 2 GHz

Hiroshi NISHI; Hideo KUWAHARA; Kiyoshi HANAMITSU; Masahito TAKUSAGAWA; Tatsuo KUDO

A Semiconductor Laser with Flat Frequency Response up to 2 GHz

Hiroshi NISHI, Hideo KUWAHARA, Kiyoshi HANAMITSU, Masahito TAKUSAGAWA, Tatsuo KUDO

Full Text Views

0

Cite this

Summary :

DH lasers are believed to be one of the most suitable light sources for optical fiber transmission. However, the light output of DH lasers has usually such detrimental effects as a relaxation oscillation and a spectral broadening during pulse response. For high bit rate and long-distance fiber transmission, lasers need to have a high performance pulse responce and a narrow spectral width. We examined the dynamic characteristics of GaAs/GaAlAs DH lasers, which had an internally striped planar (ISP) structure using sulfur diffusion, by changing the stripe width. By narrowing the stripe width to the range of 5 to 7 µm of ISP lasers with an undoped active region and the cavity length of about 150 µm, significant improvement was achieved in frequency response, pulse response and spectral behavior as well. The frequency response was flat up to 2 GHz without a resonant-like peak. The relaxation oscillation was suppressed up to 10-mW light output. The spectral width at 400-Mb/s modulation was controlled within 20 without degradation of extinction ratio. Threshold currents were in the range of 55 to 70 mA. The light output increased linearly up to 10 mW without a kink. The external differential quantum efficiency was about 60 %. These lasers are operating stably after more than 1,000 hours at 70 under 3-mW light output. A narrow stripe-geometry ISP laser has a promising feature in that it can be used in high bit rate and long-distance fiber transmission.

Publication: IEICE TRANSACTIONS on transactions Vol.E61-E No.3 pp.128-131

Publication Date: 1978/03/25

Publicized

Online ISSN

DOI

Type of Manuscript: Special Section PAPER (Special Issue on Integrated Optics and Optical Fiber Communications)

Category

Authors

Hiroshi NISHI
Hideo KUWAHARA
Kiyoshi HANAMITSU
Masahito TAKUSAGAWA
Tatsuo KUDO

Keyword

Cite this

Copy

Hiroshi NISHI, Hideo KUWAHARA, Kiyoshi HANAMITSU, Masahito TAKUSAGAWA, Tatsuo KUDO, "A Semiconductor Laser with Flat Frequency Response up to 2 GHz" in IEICE TRANSACTIONS on transactions, vol. E61-E, no. 3, pp. 128-131, March 1978, doi: .
Abstract: DH lasers are believed to be one of the most suitable light sources for optical fiber transmission. However, the light output of DH lasers has usually such detrimental effects as a relaxation oscillation and a spectral broadening during pulse response. For high bit rate and long-distance fiber transmission, lasers need to have a high performance pulse responce and a narrow spectral width. We examined the dynamic characteristics of GaAs/GaAlAs DH lasers, which had an internally striped planar (ISP) structure using sulfur diffusion, by changing the stripe width. By narrowing the stripe width to the range of 5 to 7 µm of ISP lasers with an undoped active region and the cavity length of about 150 µm, significant improvement was achieved in frequency response, pulse response and spectral behavior as well. The frequency response was flat up to 2 GHz without a resonant-like peak. The relaxation oscillation was suppressed up to 10-mW light output. The spectral width at 400-Mb/s modulation was controlled within 20 without degradation of extinction ratio. Threshold currents were in the range of 55 to 70 mA. The light output increased linearly up to 10 mW without a kink. The external differential quantum efficiency was about 60 %. These lasers are operating stably after more than 1,000 hours at 70 under 3-mW light output. A narrow stripe-geometry ISP laser has a promising feature in that it can be used in high bit rate and long-distance fiber transmission.
URL: https://global.ieice.org/en_transactions/transactions/10.1587/e61-e_3_128/_p

Copy

@ARTICLE{e61-e_3_128,
author={Hiroshi NISHI, Hideo KUWAHARA, Kiyoshi HANAMITSU, Masahito TAKUSAGAWA, Tatsuo KUDO, },
journal={IEICE TRANSACTIONS on transactions},
title={A Semiconductor Laser with Flat Frequency Response up to 2 GHz},
year={1978},
volume={E61-E},
number={3},
pages={128-131},
abstract={DH lasers are believed to be one of the most suitable light sources for optical fiber transmission. However, the light output of DH lasers has usually such detrimental effects as a relaxation oscillation and a spectral broadening during pulse response. For high bit rate and long-distance fiber transmission, lasers need to have a high performance pulse responce and a narrow spectral width. We examined the dynamic characteristics of GaAs/GaAlAs DH lasers, which had an internally striped planar (ISP) structure using sulfur diffusion, by changing the stripe width. By narrowing the stripe width to the range of 5 to 7 µm of ISP lasers with an undoped active region and the cavity length of about 150 µm, significant improvement was achieved in frequency response, pulse response and spectral behavior as well. The frequency response was flat up to 2 GHz without a resonant-like peak. The relaxation oscillation was suppressed up to 10-mW light output. The spectral width at 400-Mb/s modulation was controlled within 20 without degradation of extinction ratio. Threshold currents were in the range of 55 to 70 mA. The light output increased linearly up to 10 mW without a kink. The external differential quantum efficiency was about 60 %. These lasers are operating stably after more than 1,000 hours at 70 under 3-mW light output. A narrow stripe-geometry ISP laser has a promising feature in that it can be used in high bit rate and long-distance fiber transmission.},
keywords={},
doi={},
ISSN={},
month={March},}

Copy

TY - JOUR
TI - A Semiconductor Laser with Flat Frequency Response up to 2 GHz
T2 - IEICE TRANSACTIONS on transactions
SP - 128
EP - 131
AU - Hiroshi NISHI
AU - Hideo KUWAHARA
AU - Kiyoshi HANAMITSU
AU - Masahito TAKUSAGAWA
AU - Tatsuo KUDO
PY - 1978
DO -
JO - IEICE TRANSACTIONS on transactions
SN -
VL - E61-E
IS - 3
JA - IEICE TRANSACTIONS on transactions
Y1 - March 1978
AB - DH lasers are believed to be one of the most suitable light sources for optical fiber transmission. However, the light output of DH lasers has usually such detrimental effects as a relaxation oscillation and a spectral broadening during pulse response. For high bit rate and long-distance fiber transmission, lasers need to have a high performance pulse responce and a narrow spectral width. We examined the dynamic characteristics of GaAs/GaAlAs DH lasers, which had an internally striped planar (ISP) structure using sulfur diffusion, by changing the stripe width. By narrowing the stripe width to the range of 5 to 7 µm of ISP lasers with an undoped active region and the cavity length of about 150 µm, significant improvement was achieved in frequency response, pulse response and spectral behavior as well. The frequency response was flat up to 2 GHz without a resonant-like peak. The relaxation oscillation was suppressed up to 10-mW light output. The spectral width at 400-Mb/s modulation was controlled within 20 without degradation of extinction ratio. Threshold currents were in the range of 55 to 70 mA. The light output increased linearly up to 10 mW without a kink. The external differential quantum efficiency was about 60 %. These lasers are operating stably after more than 1,000 hours at 70 under 3-mW light output. A narrow stripe-geometry ISP laser has a promising feature in that it can be used in high bit rate and long-distance fiber transmission.
ER -