http://hdl.handle.net/10468/415 Thu, 23 May 2013 11:33:57 GMT 2013-05-23T11:33:57Z http://hdl.handle.net/10468/413 All-optical modulation converter for on-off keying to duobinary and alternate-mark inversion at 42.6 Gbps Dailey, James M.; Power, Mark J.; Webb, Rod P.; Manning, Robert J. Advanced modulation formats have become increasingly important as telecoms engineers strive for improved tolerance to both linear and nonlinear fibre-based transmission impairments. Two important modulation schemes are Duobinary (DB) and Alternate-mark inversion (AMI) [1] where transmission enhancement results from auxiliary phase modulation. As advanced modulation formats displace Return-to-zero On-Off Keying (RZ-OOK), inter-modulation converters will become increasingly important. If the modulation conversion can be performed at high bitrates with a small number of operations per bit, then all-optical techniques may offer lower energy consumption compared to optical-electronic-optical approaches. In this paper we experimentally demonstrate an all-optical system incorporating a pair of hybrid-integrated semiconductor optical amplifier (SOA)-based Mach-Zehnder interferometer (MZI) gates which translate RZ-OOK to RZ-DB or RZ-AMI at 42.6 Gbps. This scheme includes a wavelength conversion to arbitrary output wavelength and has potential for high-level photonic integration, scalability to higher bitrates, and should exhibit regenerative properties [2]. Sun, 01 May 2011 00:00:00 GMT http://hdl.handle.net/10468/413 2011-05-01T00:00:00Z http://hdl.handle.net/10468/416 Novel all-optical on-off-keyed to alternate-mark-inversion converter Dailey, James M.; Webb, Rod P.; Manning, Robert J. We numerically investigate a novel 40 Gbps OOK to AMI all-optical modulation format converter employing an SOA-based Mach-Zehnder interferometer.  We demonstrate operation with a 27-1 PRBS and explain the phase modulation's relationship with patterning. Sun, 25 Jul 2010 00:00:00 GMT http://hdl.handle.net/10468/416 2010-07-25T00:00:00Z http://hdl.handle.net/10468/417 Use of semiconductor optical amplifiers in signal processing applications Manning, Robert J.; Webb, Rod P.; Dailey, James M.; Maxwell, Graeme D.; Poustie, Alistair J.; Lardenois, Sébastien; Cotter, David We describe a 42.6 Gbit/s all-optical pattern recognition system which uses semiconductor optical amplifiers (SOAs). A circuit with three SOA-based logic gates is used to identify the presence of specific port numbers in an optical packet header. Tue, 01 Jun 2010 00:00:00 GMT http://hdl.handle.net/10468/417 2010-06-01T00:00:00Z