A novel approach to all-optical universal soliton logic gate NAND utilizing reflective semiconductor optical amplifiers
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RESEARCH ARTICLE
A novel approach to all-optical universal soliton logic gate NAND utilizing reflective semiconductor optical amplifiers K. Mukherjee1
•
K. Majhi1 • A. Raja1
Received: 13 April 2020 / Accepted: 5 August 2020 Ó The Optical Society of India 2020
Abstract Reflective semiconductor optical amplifier (RSOA) is a versatile gain medium due to its double-pass characteristics compared to ordinary semiconductor optical amplifier. RSOA-based gain dynamics is utilized to design and analyze the NAND gate using soliton pulses for the first time. The simulation results shows that RSOA is a very good candidate for intensity encoded logic gates and processors. Extinction ratio, contrast ratio, amplitude modulation, bit error rate, and eye opening are calculated. Dependence of these performance indication parameters on control pulse energy is also investigated considering amplified spontaneous emission noise. This NAND gate can be used to design any optical logic processors in future, as it is a universal one. Keywords Reflective semiconductor optical amplifier Cross-gain modulation Optical logic gate NAND gate
Introduction Reflective semiconductor optical amplifiers (RSOAs) are important elements for the realization of next-generation broadband access applications. A single RSOA can simultaneously receive and amplify signals in the downstream and re-modulates them with end-user information in the upstream communication link [1]. Recently, proposals of RSOA-based colorless transmitters [2] have been proposed and demonstrated for passive optical network (PON) & K. Mukherjee [email protected] 1
Physics Department, Banwarilal Bhalotia College, Asansol, India
applications [1–3]. RSOA is a versatile gain medium, and all-optical logic processors [4–7] have been proposed using this RSOA. RSOAs have higher gain at comparatively low injection current than single-pass semiconductor optical amplifiers (SOAs) [8]. This is due to RSOAs special construction feature with antireflection (AR) coating at one end and highly reflecting (HR) coating on the other end as shown in Fig. 1. Due to this configuration, a signal passes twice the RSOA length and is amplified twice. This produces better performance although waveguide structure of RSOAs is same as conventional single-pass SOA. RSOAs have low noise figure, gives high optical gain at low drive current, and easily saturates at lower optical power [8]. Therefore, it is a good choice for all-optical logic processing also. Most of the RSOA-based works simulated for the modulation characteristics of the RSOA for PON applications [1–3, 9, 10]. In [5, 6], RSOAs are used to design logic processors with cascading of outputs with one another, which reduces the processing speed and degrades the quality of operation. However, in [7] also RSOAs have been used to design XOR gate and processing speed of 120 Gbps has been reported. In [7], RSOA is modeled for cross-phase modulation and the XOR gate [7] is designed using interferometric structure. The NAND gate proposed in [11] us
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