In-fiber subpicosecond pulse shaping for nonlinear optical telecommunication data processing at 640 Gbit/s

• Main Authors: Azaña, J. (Author), Oxenløwe, L.K (Author), Palushani, E. (Author), Slavík, R. (Author), Galili, M. (Author), Mulvad, H.C.H (Author), Hu, H. (Author), Park, Y. (Author), Clausen, A.T (Author), Jeppesen, P. (Author)
• Format: Article
• Language: English
• Published: 2012.
• Subjects: Article
• Online Access: Get fulltext

We review recent work on all-fiber (long-period fiber grating) devices for optical pulse shaping, particularly flat-top pulse generation, down to the subpicosecond range and their application for nonlinear switching (demultiplexing) of optical time-division multiplexed (OTDM) data signals in fiber-optic telecommunication links operating up to 640 Gbit/s. Experiments are presented demonstrating error-free 640-to-10 Gbit/s demultiplexing of the 64 tributary channels using the generated flat-top pulses for temporal gating in a Kerr-effect-based nonlinear optical loop mirror. The use of flat-top pulses has critical benefits in the demultiplexing process, including a significantly increased timing-jitter tolerance (up to ~500 fs, i.e., 30% of the bit period) and the associated improvement in the bit-error-rate performance (e.g., with a sensitivity increase of up to ~13 dB as compared with the use of Gaussian-like gating pulses). Long-period fiber grating pulse shapers with reduced polarization dependence are fabricated and successfully used for polarization-independent 640-to-10 Gbit/s demultiplexing experiments.