12 February 2011 N-bits all-optical circular shift register based on semiconductor optical amplifier buffer
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In the perspective of a future all-optical communication network optical shift register will play an important role especially for what concerns several binary functions, such as serial to parallel conversion and cyclic operations, that are involved in techniques allowing error detection and correction as parity check, or cyclic redundancy check. During the last decades, several attempts of realizing circulating memories or shift register in the optical domain were made, with some limits in terms of functionality, number of bit to be stored (under three), scalability or photonic integrability. In this paper, we present a new approach to realize a circulating optical shift register consisting on an SOA-based optical buffer (OB) and a bit selecting circuit (BSC). The OB is potentially integrable and is able to store a finite number of bit at high bit rate. The BSC returns consecutive bits at a lower clock rate, achieving proper shift register function. The bit selection is realized by means of four wave mixing (FWM) in a Kerr medium, and the sequence cancellation is allowed to enable new sequence storing. Experimental validation of the scheme for fB=59MHz and fB=236MHz shows optical signal to noise ratio per bit penalty of 5.6dB at BER=10-9.
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Emma Lazzeri, Emma Lazzeri, Gianluca Berrettini, Gianluca Berrettini, Gianluca Meloni, Gianluca Meloni, Antonella Bogoni, Antonella Bogoni, Luca Potì, Luca Potì, "N-bits all-optical circular shift register based on semiconductor optical amplifier buffer", Proc. SPIE 7948, Advances in Photonics of Quantum Computing, Memory, and Communication IV, 79480O (12 February 2011); doi: 10.1117/12.873795; https://doi.org/10.1117/12.873795


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