Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1541441 | Optics Communications | 2007 | 4 Pages |
Abstract
We demonstrate experimentally >3Â dB extinction ratio improvement at the output of SOA-based delayed-interference signal converter (DISC) using optical off-centered filtering. Through careful modeling of the carrier and the phase dynamics, we explain in detail the origin of sub-pulses in the wavelength converted output, with an emphasis on the time-resolved frequency chirping of the output signal. Through our simulations we conclude that the sub-pulses and the main-pulses are oppositely chirped, which is also verified experimentally by analyzing the output with a chirp form analyzer. We propose and demonstrate an optical off-center filtering technique which effectively suppresses these sub-pulses. The effects of filter detuning and phase bias adjustment in the delayed-interferometer are experimentally characterized and optimized, leading to a >3Â dB extinction ratio enhancement of the output signal.
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Authors
B. Zhang, S. Kumar, L.-S. Yan, A.E. Willner,