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We argue that the use of nonlinear semiconductor optical amplifiers for all-optical processing of phase encoded signals offers potential benefits. To illustrate the point, we demonstrate QPSK to 8PSK conversion and decomposition of QPSK to two BPSK outputs at new wavelengths by four-wave mixing.
We demonstrate the first fully integrated all-optical XOR gate, running at 42.6Gb/s, which has on-chip delays and power splitters. Error-free operation is obtained.
We use the frequency-resolved optical gating (FROG) technique to determine the pulsewidth and chirp characteristics of wavelength-converted pulses from a turbo-switch and asymmetrical Mach-Zehnder filter combination under a variety of operating conditions. The output pulses were found to be near transform limited and had a high tolerance to line rate and input power variations.
We present for the first time error-free 42.6 Gbit/s all-optical NRZ to RZ format conversion using a single SOA. The RZ output is correctly coded, wavelength and polarity preserved, and has the flexibility of variable duty-cycle.
We demonstrate error-free all-optical 40Gb/s wavelength conversion using nonlinear polarisation rotation in semiconductor optical amplifiers (SOAs). The high speed of the device is achieved by incorporating an SOA-based turbo-switch. The switching energy is 10fJ/pulse.
We describe the operating principle and performance of the 'turbo-switch', a new configuration of semiconductor optical amplifiers (SOAs) that gives an enhanced high-speed response for all-optical switching without compromising the optical signal-noise ratio. Error-free wavelength conversion is obtained at 170 Gb/s based on the use of an offset Mach-Zehnder interferometric filter incorporating a turbo-switch...
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