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Optimal design of 2-Bit Optical Magnitude Comparator using electro-optic effect inside Mach-Zehnder interferometers

Choudhary Kuldeep, Kumar Santosh

Annals of Computer Science and Information Systems

2017

Vol. 10

15--20

In this paper, 2-bit magnitude comparator using electro-optic effect inside lithium-niobate based Mach-Zehnder interferometers (MZI) is proposed. The design is based on six MZIs only, hence proposed device is optimized in comparison of previous design. The mathematical description of device is well described. The results are verified using MATLAB and Beam propagation method simulation.

Design and performance analysis of InP/InGaAsP-MMI based 1310/1550-nm wavelength division demultiplexer with tapered waveguide geometry

Chack D., Kumar V., Raghuwanshi S. K.

Opto-Electronics Review

2015

Vol. 23, No. 4

271-277

The design and performance analysis of a 1310/1550-nm wavelength division demultiplexer with tapered geometry based on InP/InGaAsP multimode interference (MMI) coupler has been carried out. Wavelength response of demultiplexer of conventional MMI and tapered input and tapered output (tapered I/O) waveguides geometry of the MMI have been discussed. The demultiplexing function has been first performed by choosing a suitable refractive index of the guiding region and geometrical parameters such as the width and length of MMI structure have been achieved. Access width of tapered I/O waveguides have been adjusted to give a low insertion loss (IL) and high extinction ratio (ER) for the considered wavelengths of 1310 nm and 1550 nm. The total size of the demultiplexer has been significantly reduced over the existing MMI devices. Numerical simulations with finite difference beam propagation method are applied to design and optimize the operation of the proposed demultiplexer.

Optimised tapered beam propagation

Sujecki S.

Opto-Electronics Review

2000

Vol. 8, No. 3

269-274

A novel formulation of tapered beam propagation algorithm is given. The new algorithm is tested on standard taper structures in order to check the accuracy, reciprocity and the convergence rate. It is shown that the new algorithm preserves the advantages of the previous formulation while being easier to implement and requiring less computation per one propagation step. The results obtained by the new algorithm agree with ones given by the standard rectangular beam propagation method and also fulfil the reciprocity condition to four decimal places of the transmitted power.