Optical SSB Modulation by Two-Step Sideband Suppression of Wideband SCM Signals


C - Abstracts of IEICE TRANSACTIONS on Electronics (Japanese Edition)   Vol.J90-C   No.6   pp.474-482
Publication Date: 2007/06/01
Online ISSN: 1881-0217
Print ISSN: 1345-2827
Type of Manuscript: PAPER
optical SSB modulation,  microwave photonics,  optical circuits,  

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Optical SSB modulation has been discussed theotically and experimentally in some cases; the goal has been to overcome the deterioration caused by chromatic dispersion, which readily occurs in high frequency SCM signal transmission. This paper discusses the relationship between SSR and power penalty imposed by the dispersion, propose the two-step sideband suppression method and report 140 carrier 20 GHz SCM signal transmission performance achieved by the method. With regard to power penalty, we showed that SSR values of 24.9 dB, 18.8 dB, and 15.3 dB are needed for holding the maximum power penalty to 1 dB, 2 dB and 3 dB respectively; an SSB signal with SSR of 0 dB, 10 dB, 20 dB and more than 24.9 dB could be transmitted 7.5 km, 9 km, 14.6 km, and infinite distance with maximum power penalty of 1 dB. The proposed two-step sideband suppression method, which combines the optical filter method with the phase shift method to improve the SSR of the high frequency componets, achieveds the power penalty of 1.2 dB, while the phase shift method alone lets the penalty rise to 2.2 dB. The effect of the two-step sideband suppression method is also verified experimentally; 200 km trasnission over the 1.3µm zero dispersion SMF showed no difference in the carrier power compared to the back-to-back case.