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Realization of High Speed All-Optical Half Adder and Half Subtractor Using SOA Based Logic Gates
Simranjit Singh,Rajinder Singh Kaler,Rupinder Kaur 한국광학회 2014 Current Optics and Photonics Vol.18 No.6
In this paper, the scheme of a single module for simultaneous operation of all-optical computing circuits, namely half adder and half subtractor, are realized using semiconductor optical amplifier (SOA) based logic gates. Optical XOR gate by employing a SOA based Mach-Zehnder interferometer (MZI) configuration is used to get the sum and difference outputs. A carry signal is generated using a SOA-four wave mixing (FWM) based AND gate, whereas, the borrow is generated by employing the SOA-cross gain modulation (XGM) effect. The obtained results confirm the feasibility of our configuration by proving the good level of quality factor i.e. ~5.5, 9.95 and 12.51 for sum/difference, carry and borrow, respectively at 0 dBm of input power.
Optimizing the Net Gain of a Raman-EDFA Hybrid Optical Amplifier using a Genetic Algorithm
Simranjit Singh,Rajinder-Singh Kaler 한국광학회 2014 Current Optics and Photonics Vol.18 No.5
For the first time, a novel analytical model of the net gain for a Raman-EDFA hybrid optical amplifier (HOA) is proposed and its various parameters optimized using a genetic algorithm. Our method has been shown to be robust in the simultaneous analysis of multiple parameters (Raman length, EDFA length, and pump powers) to obtain large gain. The optimized HOA is further investigated at the system level for the scenario of a 50-channel DWDM system with 0.2-nm channel spacing. With an optimized HOA, a flat gain of >17 dB is obtained over the effective ITU-T wavelength grid with a variation of less than 1.5 dB, without using any gain-flattening technique. The obtained noise figure is also the lowest value ever reported for a Raman-EDFA HOA at reduced channel spacing.
Simranjit Singh,Sonak Saini,Gurpreet Kaur,Rajinder Singh Kaler 한국광학회 2014 Current Optics and Photonics Vol.18 No.2
For multi parameter optimization of Raman Fiber Amplifier (RFA), a simple genetic algorithm is presented in the scenario of a 320 channel Dense Wavelength Division Multiplexed (DWDM) system at channel spacing of 25 GHz. The large average gain (> 22 dB) is observed from optimized RFA with the optimized parameters, such as 39.6 km of Raman length with counter-propagating pumps tuned to 205.5 THz and 211.9 THz at pump powers of 234.3 mW, 677.1 mW respectively. The gain flattening filter (GFF) has also been optimized to further reduce the gain ripple across the frequency range from 190 to 197.975 THz for broadband amplification.
Ultrahigh Speed Reconfigurable Logic Operations Based on Single Semiconductor Optical Amplifier
Sanmukh Kaur,Rajinder-Singh Kaler 한국광학회 2012 Current Optics and Photonics Vol.16 No.1
We demonstrate an optical gate architecture using a single SOA to perform AND, OR and NOT logic functions. Simple reconfigurable all-optical logic operations are implemented using RZ modulated signals at 40 Gb/s. Contrast ratio and extinction ratio values have been analysed for the different types of logic gates. Maximum extinction ratio and contrast ratio achieved are 19dB and 17.2 dB respectively. Simple structure and potential for integration makes this architecture an interesting approach in photonic computing and optical signal processing.
Sanmukh Kaur,Rajinder Singh Kaler,Tara-Singh Kamal 한국광학회 2015 Current Optics and Photonics Vol.19 No.3
We propose a new and potentially integrable scheme for the realization of an all-optical binary fulladder employing two XOR gates, two AND gates, and one OR gate. The XOR gate is realized usinga Mach-Zehnder interferometer (MZI) based on a semiconductor optical amplifier (SOA). The AND andOR gates are based on the nonlinear properties of a semiconductor optical amplifier. The proposed schemeis driven by two input data streams and a carry bit from the previous less-significant bit order position. In our proposed design, we achieve extinction ratios for Sum and Carry output signals of 10 dB and 12dB respectively. Successful operation of the system is demonstrated at 10 Gb/s with return-to-zeromodulated signals