FM and FSK response of tunable two-electrode DFB lasers and theirperformance with noncoherent detection |
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Authors: | Willner AE Kuznetsov M Kaminow IP Stone J Stulz LW Burrus CA |
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Affiliation: | AT&T Bell Lab., Holmdel, NJ; |
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Abstract: | Two-electrode distributed-feedback (DFB) lasers show promise for combining high speed and frequency tunability for frequency-division-multiplexed-frequency-shift-keyed (FDM-FSK) networks. The FM and FSK responses of such lasers have been measured up to modulation frequencies of ~1 GHz. Using these lasers in a noncoherent detection system in which a fiber Fabry-Perot tunable optical filter converts an FSK signal into an amplitude-shift-keyed (ASK) format, a 10 -9 BER was observed up to 1 Gb/s. Nonuniform FM response and consequent tone broadening of the optical FSK spectra can lead to system power penalties due to optical-filtering effects. Thus, for a given FM response, the behavior of these lasers in FSK optical systems can be projected |
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