We experimentally demonstrate all-fiber optical Manchester code generation at 10 Gbit/s using nonlinear polarization rotation in a single 1- km highly-nonlinear fiber with the nonlinearity of 20.4 W-1km-1. 33-dB extinction ratio is achieved in a -4-dBm CW dummy channel by coinjecting orthogonally aligned two 8-dBm pumps into the Kerr medium. Our encoder functions with 10 Gbit/s NRZ data stream and 10 GHz optical clock as the pumps. We present the resultant waveform as well as the optical spectrum of the Manchester-coded output.

We propose and create a novel structure formed with thinned fiber Bragg gratings and carbon nanotubes utilizing their optical absorption characteristics. We show that the reflection band of the fiber Bragg gratings can be shifted by controlling the in-line optical power. We use the structure to realize two applications namely an all-fiber tunable filter and a high-optical-power blocker.

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We theoretically and experimentally show that the channel spacing of strongly chirped sampled fiber Bragg gratings can be adjusted by applying a linear strain along the gratings and changing the chirp rates. Using the method, we realize a channel-spacing-tunable multiwavelength fiber laser.