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Simulation of heterodyne RoF systems based on 2 DFB lasers: application to an optical phase-locked loop design

Published online by Cambridge University Press:  19 February 2014

Wosen-Eshetu Kassa*
Affiliation:
Conservatoire National des Arts et Métiers, ESYCOM, 75141 Paris Cédex 3, France. Phone: +33 140272082
Anne-Laure Billabert
Affiliation:
Conservatoire National des Arts et Métiers, ESYCOM, 75141 Paris Cédex 3, France. Phone: +33 140272082
Salim Faci
Affiliation:
Conservatoire National des Arts et Métiers, ESYCOM, 75141 Paris Cédex 3, France. Phone: +33 140272082
Catherine Algani
Affiliation:
Conservatoire National des Arts et Métiers, ESYCOM, 75141 Paris Cédex 3, France. Phone: +33 140272082
*
Corresponding author: W. E. Kassa Email: woseneshetu.kassa@cnam.fr

Abstract

This paper presents a simulation approach of optical heterodyne systems by using the equivalent circuit representation of a distributed feedback laser (DFB) in the electrical domain. Since the electrical representation of the DFB laser is developed from the rate equations, its characteristics such as non-linearity, relative intensity noise (RIN), and phase noise can be predicted precisely for various biasing conditions. The model is integrated in a heterodyne radio over fiber (RoF) system where two DFB lasers are used to generate a millimeter-wave (mm-wave) signal. An optical phase-locked loop is also introduced to reduce the phase noise on the mm-wave signal. The optical phase noise contribution of individual lasers to the mm-wave signal is evaluated and compared with theoretical results. It is shown that the phase noise of the mm-wave is reduced considerably depending on the loop bandwidth and propagation delay. With the circuit simulation approach proposed, optical and mm-wave phase noises can be studied together with other circuit environments such as parasitic effects and driver circuits.

Type
Articles Selected from the 2013 National Microwave Days in France
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2014 

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References

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