All-optical full adder with bit-differential delay

“…Experimental work was even done on a half adder using SOA based devices at 10Gbps [13]. Poustie et al [14][15] demonstrated an all-optical digital processing circuit that can perform the half addition and full addition of binary optical words of arbitrary lengths using a SOA based bit differential technique. In [16], the integrated operation of optical logic and arithmetic operations with the help of terahertz optical asymmetric demultiplexer (TOAD) along with optical tree architecture have been demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Realization of High Speed All-Optical Half Adder and Half Subtractor Using SOA Based Logic Gates

Singh¹,

Kaler²,

Kaur³

2014

Journal of the Optical Society of Korea

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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.

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“…Even though there are some demonstrated combinational (memory-less) logic circuit such as adder and subtractor [10,11,12], more complex all optical combinational logic circuit has not been reported yet. Because, it is still hard to implement complex combinational logic circuit all-optically by the reasons of many problems which are arose due to large system scale and non-ideal all optical logic gate elements.…”

Section: Introductionmentioning

confidence: 99%

All-optical 4-bit Gray code to binary coded decimal converter

2008

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All-optical 4-bit Gray code to binary coded decimal (BCD) converter was demonstrated, for the first time in our knowledge, with the number of 12 SOAs by means of commercially available numerical analysis tool (VPI). Circuit design approach was modified appropriately in order to fit the electrical method on an all-optical logic circuit based on cross gain modulation (XGM) process so that signal degradation due to the non-ideal optical logic gates can be minimized. In our approach, only using XGM process as a nonlinear function, the maximum number of XGM process serially underwent by input signals is twice at the most insuring signal quality. Without regenerations, Q-factor of around 4 was obtained for the most severely degraded output bit (least significant bit -LSB) with 2.5Gbps clean input signals having 20dB extinction ratio. It is worth to note that, implementing this LSB is complex enough to give it as an example of a 4-bit conversion system. While modifying two-level simplification method and Karnaugh map method to design Gray code to BCD converter, general design concept was also founded in this research not only for the Gray code to BCD converter but also for any general applications such as encoder / decoder, multiplexer / demultiplexer, and read only memory so that readers can develop their own all-optical logic device easily using XGM process in SOAs.

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All-optical full adder with bit-differential delay

Cited by 78 publications

References 19 publications

All-optical Digital Processing Through Semiconductor Optical Amplifiers

All-optical Digital Processing Through Semiconductor Optical Amplifiers

Realization of High Speed All-Optical Half Adder and Half Subtractor Using SOA Based Logic Gates

All-optical 4-bit Gray code to binary coded decimal converter

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