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Optica Publishing Group
  • Optical Fiber Communications Conference
  • OSA Trends in Optics and Photonics (Optica Publishing Group, 2002),
  • paper ThGG93

A Microwave Spectral Approach for Aligning High Speed Data and Soliton Pulse Trains in Dual Mach-Zehnder Modulator Optical Transmitters

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Abstract

Long haul high data rate Wavelength Division Multiplexed (WDM) optical transmission is very important to the future of optical networking. One way to better accomplish this is by transmit ting data using dispersion managed solitons.1,2,3,4 Usually such a system is built using two cascaded Mach-Zehnder modulators. One modulator amplitude modulates the incoming light wave such that it takes on the characteristics of a soliton pulse train, while a second modulator is used to “on-off”modulate the train of soliton pulses such that the resulting light wave takes the form of a dispersion managed soliton. Key to this operation is the alignment of the soliton pulse train with the data. In the laboratory, this is accomplished using microwave line stretchers that are manually adjusted while the individual monitors the bit error rate (BER) of the link and the eye diagram on a digital oscilloscope. This is fine for laboratory operation, however, if such systems are to make there way into the field, a more automatic, low cost approach must be obtained.

© 2002 Optical Society of America

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