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"Khoe, G.D."
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Bit pattern dependence in optical DQPSK modulation
A strong bit pattern dependence in optical transmission links employing multilevel modulation formats when pseudorandom binary sequences are used for modulation is demonstrated. The use of pseudorandom quaternary sequences for multilevel modulation is proposed and an efficient method to generate such sequences is presented.
Journal Article
All-optical flip-flop memory based on two coupled polarisation switches
An all-optical flip-flop memory with separate set and reset inputs is presented. The flip-flop is realised from two coupled polarisation switches. The concept is explained and experimental results are presented that demonstrate that a contrast ratio of 20 dB and a switching power of < -3 dBm can be obtained. The all-optical flip-flop can be utilised in all-optical packet switches.
Journal Article