We present a novel scheme for subharmonic clock recovery from an optical time-division-multiplexing signal using time-domain optical Fourier transformation and a narrowband optical filter. High-resolution 640-Gb/s clock recovery is successfully demonstrated with no pattern dependence. The clock recovery is also applied to a 640-Gb/s differential phase-shift-keying transmission, and error-free performance is achieved over 300 km.
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Guan, P., Mulvad, H. C. H., Kasai, K., Hirooka, T., & Nakazawa, M. (2010). High Time-Resolution 640-Gb/s Clock Recovery Using Time-Domain Optical Fourier Transformation and Narrowband Optical Filter. I E E E Photonics Technology Letters, 22(23), 1735-1737. https://doi.org/10.1109/LPT.2010.2083644