Proposal and Performance Evaluation of an Efficient RZ-DQPSK Modulation Scheme in All-Optical OFDM Transmission Systems. - Seyed E. Mirnia; Arman Zarei; Siamak Dawazdah Emami; Sulaiman Wadi Harun; Hamzah Arof; Harith Ahmad; Hossam M. H. Shalaby (JOCN, 2013)