Proposal for ultrafast all-optical pseudo random binary sequence generator using microring resonator-based switches
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Proposal for ultrafast all‑optical pseudo random binary sequence generator using microring resonator‑based switches Jayanta K. Rakshit1 · Kyriakos E. Zoiros2 · Gaurav K. Bharti1 Received: 30 June 2020 / Accepted: 3 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract An all-optical pseudo-random binary sequence (PRBS) generator is designed and simulated employing micro-ring resonators (MRRs) as the core technology. The PRBS generator consists of serially connected D flip-flops realized with doublebus MRR-based switches that exploit two-photon absorption induced in a pump-probe configuration, and of a MRR-based feedback XOR gate whose design is simpler than previously reported. The expected operation is theoretically validated for 3-bit and 4-bit degree PRBS generators and can be extended to higher PRBS orders with the straightforward addition of extra MRR-based D flip-flops. The MRR critical parameters, including radius, coupling coefficient and detuning, are optimized against performance metrics through numerical simulation at 250 Gb/s. The selection of these parameters according to the derived specifications can render feasible the practical implementation of the scheme and its exploitation for all-optical signal processing purposes. Keywords All-optical switch · Microring resonator · Optical flip-flop · Pseudo random binary sequence
1 Introduction In the last few decades, considerable research work has been carried-out to address the challenges of data generation, transmission and processing in evolving lightwave systems and networks [1–15]. The main objective of these efforts has been to realize the concept and vision of optical communications where the necessary operations will depend only upon photons rather than electrons and, therefore, will be executed exclusively in the optical domain without the bottlenecks of optoelectronic conversions. Concurrently, configurability, compactness and programmability are important features which modern implementations should exhibit toward advanced functionality and intelligence in the optical layer. For this purpose, various all-optical switching functionalities have been implemented at combinational and sequential * Kyriakos E. Zoiros [email protected] 1
Electronics and Instrumentation Engineering Department, National Institute of Technology Agartala, Agartala, Tripura, India
Lightwave Communications Research Group, Department of Electrical and Computer Engineering, Democritus University of Thrace, Xanthi, Greece
2
level using microring resonator (MRR) technology [6–20]. This activity has been spurred owing to MRRs compact size, high-Q, ultrafast and controllable nonlinearity, ultralow power consumption and compatibility with microelectronic fabrication methods and material systems [21–23]. These appealing features allow MRR compete favorably against other technological options employed for the same purpose and comply more easily with the scopes and trends of alloptical signal processing. Pseudo random binary seque
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