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.
A novel solution for all-optical packets buffering in OPS nodes is proposed. Variable delays are performed by exploiting
a low-loss optically controlled fiber-based loop configuration. XGM in SOAs allows polarization and wavelength
independent operation in the whole C-band. A packet delay resolution of 5 μs is obtained as well as a storage time of
50 μs with moderate signal degradation. Performances are evaluated in terms of bit error rate measurements for 10 Gb/s
NRZ data payload, providing an OSNR penalty lower than 3 dB after 10 circulations. The proposed solution is
particularly attractive in slotted OPS nodes architectures where packet contention would be managed entirely in the
optical domain.
An all-optical and ultra-fast combinatorial network based on semiconductor optical amplifiers and able to detect packet
contention in a 2x2 photonic node is demonstrated. The signal at the output of the combinatorial network has a contrast
ratio higher than 8.4 dB. The combinatorial network is used for demonstrating the feasibility of a 2x2 photonic node at
160 Gb/s.
A sub-ps optical sampler based on Four Wave Mixing (FWM) in 250 meter-long Highly Non-Linear Fibre (HNLF), has been implemented. Its accuracy resolving ps soliton pulses has been estimated exploiting a commercial oscilloscope and a commercial autocorrelator.
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