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All-optical ultrafast switching in a silicon microring resonator and its application to design multiplexer/demultiplexer, adder/subtractor and comparator circuit

Rakshit J. K., Roy J. N.

Optica Applicata

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2016

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Vol. 46, nr 4

517--539

EN

In this paper, the possibility of using a silicon waveguide based microring resonator as a nonlinear all-optical switch is described under low power operation through a two-photon absorption effect. All-optical multiplexer/demultiplexer scheme based on two cascaded microring resonators has been proposed and described. The proposed circuits require smaller number of ring resonators and a single circuit consisting of two microring resonators capable to perform both multiplexer/demultiplexer operations by simply interchanging the inputs and outputs. Two optical pump signals represented the two operands of the logical operations to modulate the two microring resonators. The demultiplexer circuit can also perform as a half-adder/subtractor and a single bit data comparator. Numerical simulation results confirming described methods are given in this paper. The performances of the schemes are analyzed by calculating the extinction ratio, contrast ratio and amplitude modulation of the resulting data streams.

2

Design of all-optical time-division multiplexing scheme with the help of microring resonator

Rakshit J K, Roy J N

Optica Applicata

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2014

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Vol. 44, nr 1

39--54

EN

Optical time-division multiplexing is a natural multiplexing technique leading to terabit/s transmission capacity for many services that will be found in near future optical telecommunication networks. In this paper we have conducted a theoretical study of all-optical time-division multiplexing switching using GaAs-AlGaAs based microring resonator together with performances characteristics. The proposed circuit is more compact, simple and will be helpful in designing all-optical telecommunication circuits in near future. Numerical simulation results confirming described methods are given in this paper.

3

Optoelectronic multiplexer for digital data processing based on liquid crystal pixels and optical fiber elements

Perez I., Pena J. M. S., Torres J. C., Manzanares R., Marcos C., Vazquez C.

Opto-Electronics Review

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2007

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Vol. 15, No. 2

78-81

EN

In this work, we present an optoelectronic digital multiplexer 4:1 based on a multipixel nematic liquid crystal cell. This device uses two optical control signals to select one among four possible optical data inputs. These data signals are generated by four red LEDs, which are guided through plastic optical fiber towards liquid crystal pixels. For our purpose, only four pixels of the cell will be used to modulate the optical signal across them. Each pixel will be addressed by a square waveform coming from the conditioning circuit managed by a microcontroller system. The electronic control allows the multiplexer to work as simple two input logical gates such as AND, NAND, OR, NOR, XOR and XNOR. The operation time of the device is limited by the response time of LC cell that is in the