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Proceedings Paper

Wideband and high-efficiency AlInAs/GaInAs waveguide photodetectors for 40-Gbps receivers
Author(s): Toshitaka Torikai; Takeshi Nakata; Takeshi Takeuchi; Kikuo Makita
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Paper Abstract

Two types of waveguide photodiodes (WG-PD) - an evanescently coupled photodiode (EC-WG-PD) and a separated-absorption-and-multiplication avalanche photodiode (SAM-WG-APD) - have been developed for use in 40-Gbps receivers. The EC-PD is much more robust than a conventional WG-PD under high optical input operation because of its distributed absorbed optical power density along the light propagation in the waveguide. The EC-WG-PD simultaneously exhibited a high external responsivity of 0.96 A/W, a wide bandwidth of >40 GHz, and as high as 10-mA photocurrent operation. On the other hand, the SAM-WG-APD has a wide bandwidth of 30-35 GHz and a gain-bandwidth product of 140-180 GHz as a result of its small waveguide mesa structure and a thin multiplication layer. Record highest receiver sensitivities of -28.8 dBm at 10 Gbps and -19.6 dBm at 40 Gbps have been achieved for the first time.

Paper Details

Date Published: 11 July 2002
PDF: 12 pages
Proc. SPIE 4870, Active and Passive Optical Components for WDM Communications II, (11 July 2002); doi: 10.1117/12.475569
Show Author Affiliations
Toshitaka Torikai, NEC Corp. (Japan)
Takeshi Nakata, NEC Corp. (Japan)
Takeshi Takeuchi, NEC Corp. (Japan)
Kikuo Makita, NEC Corp. (Japan)


Published in SPIE Proceedings Vol. 4870:
Active and Passive Optical Components for WDM Communications II
Achyut Kumar Dutta; Abdul Ahad Sami Awwal; Niloy K. Dutta; Katsunari Okamoto, Editor(s)

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