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Optical Engineering

Analysis and design of ultrahigh-speed all-optical semiconductor-optical-amplifier-assisted Sagnac recirculating shift register with an inverter
Author(s): Kyriakos E. Zoiros; J. Vardakas; Thanassis Houbavlis; Christos Koukourlis
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Paper Abstract

The operation of a semiconductor-optical-amplifier-assisted Sagnac recirculating shift register with an inverter is studied theoretically and analyzed using a numerical model developed for this purpose. The impact of critical operational parameters, such as the SOA small-signal gain and carrier lifetime, the controlling pulses' energy and width, and the Sagnac loop asymmetry, on the switching energy and contrast ratio metrics is thoroughly investigated. The performance of the shift register is first evaluated at 10 GHz by comparing the simulated results against experimental ones, which reveals good agreement and proves the validity of the model. The model is then exploited to derive the optimum operating conditions in terms of the critical parameters that render feasible the extension of the storage capability to 20 GHz. The analysis demonstrates that the major limiting factor in achieving this goal is the SOA carrier lifetime, which must be significantly reduced. Since this requirement cannot be satisfied by simply varying the SOA bias current, either efficient gain recovery acceleration techniques must be used (at the cost of increased complexity), or the faster response and ultrahigh-speed switching potential of quantum-dot SOAs can be exploited.

Paper Details

Date Published: 1 June 2005
PDF: 12 pages
Opt. Eng. 44(6) 065001 doi: 10.1117/1.1925530
Published in: Optical Engineering Volume 44, Issue 6
Show Author Affiliations
Kyriakos E. Zoiros, Democritus Univ. of Thrace (Greece)
J. Vardakas, Democritus Univ. of Thrace (Greece)
Thanassis Houbavlis, National Technical Univ. of Athens (Greece)
Christos Koukourlis

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