N. K. Shukla

Pre-, post, symmetric1 and 2 compensation techniques with RZ modulation

The capacity of optical communication systems is rising exponentially in order to follow the rapidly increasing demand for data traffic. Limitations due to dispersion and nonlinearities in the optical fiber become more stringent for higher bit rates. To meet the growing demand of capacity for long haul communication system and to improve the transmission quality by minimizing the signal degradation the comparison of different modulation formats i.e NRZ and RZ with different dispersion compensation techniques pre, post and symmetric onto the link of 32 × 10 Gb/s is done.

Efficient modulation formats for higher bit rates fiber transmission

The study of advanced modulation formats for high speed internet services using potentially the bandwidth of single mode embedded fiber is very important. Basically, the use of RZ format is considered in order to reduce the inter-symbol interference (ISI) caused mainly by effects such as Chromatic Dispersion (CD), Polarization Mode Dispersion (PMD) and Nonlinear effects. The comparative analysis among the RZ and NRZ formats is carried out by means of the obtaining different spectrums.

High-Speed 120 Gbps AMI-WDM-PDM Free Space Optical Transmission System

Abstract Free space optical (FSO) communication systems are gaining high popularity from the last decade due to its various advantages such as no license spectrum, low-cost implementation etc. In this work, 160 Gbps data is transmitted over 8 km FSO link by adopting alternate mark inversion (AMI), wavelength division multiplexing (WDM) and polarization division multiplexing (PDM) schemes. The results are reported in terms of Q factor, bit error rate, signal to noise ratio, total received power and eye diagrams.

Study in F.O.C. Multiplexing Techniques-A Review

Study in F.O.C. Multiplexing Techniques-A Review Communication network bandwidth requirement is growing at stunning rate, consequently numerous multiplexing techniques have been proposed by contributors for the augment in spectral efficiency from time to time. In this view the paper presents profound review on numerous multiplexing techniques for fiber optic communication, such as wavelength division multiplexing, optical time division multiplexing, optical code division multiplexing, optical orthogonal division multiplexing, mode division multiplexing, space division multiplexing, polarization division multiplexing and duty cycle division multiplexing technique.

Design and Performance Analysis of MZI Based 2×2 Reversible XNOR Logic Gate

Abstract In this article, first the model of 2×2 reversible logic gate is proposed after then the performance of the proposed designed is evaluated. With the increasing flow of information, data rate is increasing very rapidly. This has resulted in increased amount of heat dissipation from the processing nodes. Generally, electronic processors dissipate heat if the data rate is very high. Hence, this model will be very helpful for solving this problem. Evaluated performance of this model is based on the value of quality factor and extinction ratio. The quality factor and extinction ratio are evaluated under different conditions. The average extinction ratio of the design is 19.58 dB and the average quality factor is 53.03 dB. The optical cost of the proposed circuit is 1.

Design of All Optical Line Selector Based on SOA for Data Communication

This manuscript discusses the photonic circuit of all optical line selector. The modeling is done by using 2x2 optical coupler, multiplexer and nonlinearities of semiconductor optical amplifier (SOA) like cross gain modulation and cross phase modulation. These non linear characteristics are considered as a drawback when SOA is used as an amplifier. The suggested model selects an optical data line and gives it at its output. Which data line is to be selected depends upon the value of the select line. This model works for two data lines. The proposed models performance is judged on the basis of two parameters, extinction ratio and quality factor which were observed for RZ, NRZ and Manchester modulation schemes. The development of integrated photonic circuits is leading towards the all optical signal processing which is ultimately eliminating the need for opto-electronic conversion.

Performance Study of Novel Designed Hybrid WDM System

Performance Study of Novel Designed Hybrid WDM System This article presents investigation of the proposed hybrid WDM scheme with mixed data rates (10 and 20 Gbps), different modulation schemes and unequal channel spacing (100 GHz/50GHz). The investigated hybrid system consists of five transmitters and each transmitter has four channels having total capacity of twenty channels. Numerous optical modulators such as linear modulator, DPSK modulator, Sin2 modulator, Dual Arm Balanced and unbalanced MZM have been implemented on the transmission links. The simulated results depicted excellent performance with linear modulator, phase modulator while unbalanced MZM has showed degraded transmission performance for arbitrarily selected transmission distances 200 km, 320 km and 360 km. Hence, the study of hybrid WDM system illustrates that it can be capable scheme for further augment in spectral efficiency and significant viable option for the present and future active, passive optical networks.