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Proceedings Paper

AlGaInAs semi-insulating buried-heterostructure distributed reflector lasers for low-driving-current high-speed direct modulation
Author(s): Takasi Simoyama; Manabu Matsuda; Shigekazu Okumura; Ayahito Uetake; Mitsuru Ekawa; Tsuyoshi Yamamoto
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Paper Abstract

AlGaInAs-MQW distributed reflector (DR) laser with semi-insulating buried-heterostructure (SI-BH) has been developed as a high speed light source for short reach data transmissions. The DR laser has DBR mirrors on both sides of a DFB active region. Owing to the increased optical feedback with these DBR mirrors, we can obtain short-cavity lasers without increasing threshold gain. The small active region of the DR laser, which comes from the combination of the short cavity structure and the SI-BH waveguide, makes driving current lower. The fabricated DR lasers have shown excellent characteristics such as stable single mode operation, and high values of relaxation oscillation frequencies under low driving current in a wide temperature range. We have achieved 25- and 40-Gbps direct modulation with low driving current. Using four different wavelength DR lasers, whose lasing wavelengths coincide with LAN-WDM grid, 25.8- Gbps direct modulations with sufficient mask margins was obtained. Using 1.55-μm-wavelength DR lasers, we achieved 40-Gbps direct modulation with 5 dB dynamic extinction ratio with the driving current less than 50 mA even at 85°C. 40-Gbps fiber transmission over 10-km single mode fiber under the operation conditions up to 70°C was also confirmed in 1.3-μm wavelength.

Paper Details

Date Published: 8 February 2012
PDF: 9 pages
Proc. SPIE 8277, Novel In-Plane Semiconductor Lasers XI, 82770B (8 February 2012); doi: 10.1117/12.906607
Show Author Affiliations
Takasi Simoyama, Photonic Electronics Technology Research Association (Japan)
Fujitsu Ltd. (Japan)
Fujitsu Labs., Ltd. (Japan)
Manabu Matsuda, Photonic Electronics Technology Research Association (Japan)
Fujitsu Ltd. (Japan)
Fujitsu Labs., Ltd. (Japan)
Shigekazu Okumura, Fujitsu Labs., Ltd. (Japan)
Ayahito Uetake, Photonic Electronics Technology Research Association (Japan)
Fujitsu Ltd. (Japan)
Fujitsu Labs., Ltd. (Japan)
Mitsuru Ekawa, Photonic Electronics Technology Research Association (Japan)
Fujitsu Ltd. (Japan)
Fujitsu Labs., Ltd. (Japan)
Tsuyoshi Yamamoto, Fujitsu Labs., Ltd. (Japan)


Published in SPIE Proceedings Vol. 8277:
Novel In-Plane Semiconductor Lasers XI
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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