Design of a high bit rate burst mode clock and data recovery (BMCDR) circuit for gigabit passive optical networks (GPON) is described. A top-down design flow is established and some of the key issues related to the behavioural level modeling are addressed in consideration for the complexity of the BMCDR integrated circuit (IC). Precise implementation of Simulink behavioural model accounting for the saturation of frequency control voltage is therefore developed for the BMCDR, and the parameters of the circuit blocks can be readily adjusted and optimized based on the behavioural model. The newly designed BMCDR utilizes the 0.18um standard CMOS technology and is shown to be capable of operating at bit rate of 2.5Gbps, as well as the recovery time of one bit period in our simulation. The developed behaviour model is verified by comparing with the detailed circuit simulation.
Optimal dispersion compensation ratio (DCR) shall be carefully chosen for different dispersion-managed systems. We simulated the dispersion-managed systems of 40 Gb/s bit rate and present the optimal values for different signal powers and transmission lengths.
In this paper, we propose an optical switch that combines both shared tunable wavelength converter and partially shared buffering together. The packet contention can be resolved both in the time domain (output buffering and partially shared buffering) and frequency domain (wavelength conversion) simultaneously and switching performance can be greatly improved. Various simulations are carried out to show the performance of different buffering and wavelength conversion structures. The results confirm that the switching architecture we proposed has excellent performance.
Optical fiber Raman amplifiers are well suited for application in optical DWDM systems and networks. Instantaneous pump depletion due to different pump power requirement of bit 1's and bit 0's will induce extra optical noise and cross talk. This paper analyzes this kind ofnoise source and presents simulation results of the dependence of optical SNR drop on fiber length, bit rates and channel numbers.
In this paper, we improve the rate equations of the Single Quantum Well Laser Diodes (SWQ-LD's) by introducing photon phase equation and three terms of Langivin noise for carriers and photons. Modeling of SQW-LD by means of Matlab Simulink is present. Small signal modulation response, relative intensity noise (RIN) and phase noise are studied. Various simulation results are given.
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