Demonstration and characterisation of a non-inverting all-optical read/write regenerative memory

Abstract

An all-optical regenerative memory device using a single loop mirror and a semiconductor optical amplifier is experimentally demonstrated. This configuration has potential for a low power all-optical stable memory device with non-inverting characteristics where packets are stored through continuously injecting the regenerated data back into the loop.

On the design of semiconductor optical amplifier-assisted Sagnac interferometer with full data dual output switching capability

“…possible fluctuations of the power content of the driving data pulses, which in turn makes easier the direct exploitation of the considered switch in larger circuits or subsystems, as in the applications of interest [17][18][19][20][21][22], and in particular when there may be an additional operational difficulty due to the existence of feedback paths. Moreover, if the findings according to rules 1 and 2 are correlated to the relevant information available in [33], which can be done by matching the corresponding control signal characteristics, then the equivalent control energy is so small that even if PDG were significant to affect the saturation of the SOA, the phase shift difference that would be induced between the orthogonal polarization modes of the clock pulses would be negligible.…”

“…The common characteristic of these photonic circuits and subsystems is that they exploit the product of the switching procedure that emerges at a different terminal from the incoming one (transmission mode [3]), which has affected likewise the trend governing the reported simulation studies [10][11][12][13][14][15][16]. On the other hand there are sophisticated applications that also utilize the signal that comes out from the same point from which it was initially launched (reflection mode [3]), as it happens in parallel Boolean logic and arithmetic operations [17], modular arithmetic [18], binary-toquaternary encoding/decoding [19], buffering [20,21] and multivalued logic [22]. Therefore it would be desirable to optimize the outcome at the two exits simultaneously so that each can serve its destined functional purpose in the most appropriate way and both can cover as many practical cases as possible.…”

“…Although there have been reported efforts towards that direction in SOA-based interferometric switches, yet they have been limited to add/drop multiplexing [23], [29][30][31] where many clock pulses travel through the interferometer but are not acted on by the control so that the performance of the switch may be less sensitive to the SOA dynamics [25]. In contrast this paper aims at extending the pursued scope to the general situation of full data switching, which is a more realistic scenario for the applications of interest [17][18][19][20][21][22] and may impose a greater strain on the SOA behaviour. For this purpose a theoretical treatment is conducted by means of numerical modelling adapted to the given circumstances to systematically investigate the impact of the critical parameters on the defined performance metrics.…”

All-optical Multiplication with the help of Semiconductor Optical Amplifier—assisted Sagnac Switch

“…Application of TOAD in ultrafast all-optical switching has received a great deal of interest in the last few years because of its simplicity and low switching energy [19][20][21][22][23][24][25][26][27][28][29][30][31][32]. Sokoloff et al demonstrated a new device, the terahertz optical asymmetric demultiplexer (TOAD) capable of demultiplexing data at 50 Gbits/s [4].…”

Design of universal shift register based on electro-optic effect of LiNbO3 in Mach–Zehnder interferometer for high speed communication

“…The authors focus on all-optical shift register implementations that use SOA based interferometric configurations and also demonstrate an all-optical memory based on the SOA-assisted ultrafast nonlinear interferometer capable of reading/writing 20 Gb/s packets of variable length without data inversion (Zoiros et al 2004). An all-optical regenerative memory device using a single loop mirror and a SOA has been proposed, which is capable of storing a 4.4 k bit data packet for a period of one second (Johnson et al 2008). An alloptical pseudorandom binary sequence generator with TOAD-based D flip-flops has been described in (Zoiros et al 2011).…”