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Proceedings Paper

Equalized APD-based receiver for ultrafast optical communication system
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Paper Abstract

Due to their high electrical bandwidth and good signal-to-noise ratio, optical receivers that utilize a combination of PIN photodetectors and erbium-doped fiber amplifiers (EDFAs) have emerged as an attractive technology for high-speed optical communication. However, the drawbacks of this technology are cost and bulkiness. Since avalanche photodiodes (APDs) are capable of amplifying the photocurrent internally, without the need for optical preamplification, they may offer a cost-effective and compact alternative to the PIN-EDFA combination. Unfortunately, this internal optoelectronic gain comes at the expense of uncertainty in the APD's gain, and more importantly, at the expense of reduced speed due to the notorious avalanche buildup time. The relatively slow response time of an APD, compared to a PIN photodiode, introduces significant inter-symbol interference (ISI) at high operational transmission rates. In this work, an equalization approach is undertaken to compensate for buildup-time-induced ISI by means of either the transversal equalizer (TE) or the decision-feedback equalizer (DFE). To design the equalizers, the APD-based receiver is viewed as a random linear channel whose impulseresponse function is a stochastic process. The mean and the correlation matrix of the receiver's random impulseresponse function are numerically determined by utilizing a recently developed analytical model. It is revealed that these equalizers can reduce the bit-error-rate (BER) remarkably at high transmission rates; this makes current InP APDs potentially suitable for near 40-Gbps digital operation.

Paper Details

Date Published: 12 October 2006
PDF: 8 pages
Proc. SPIE 6368, Optoelectronic Devices: Physics, Fabrication, and Application III, 636807 (12 October 2006); doi: 10.1117/12.685659
Show Author Affiliations
Peng Sun, Univ. of New Mexico (United States)
Majeed M. Hayat, Univ. of New Mexico (United States)


Published in SPIE Proceedings Vol. 6368:
Optoelectronic Devices: Physics, Fabrication, and Application III
Joachim Piprek; Jian Jim Wang, Editor(s)

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