title: Adaptively modulated optical OFDM modems utilizing RSOAs as intensity modulators in IMDD SMF transmission systems.
abstract: Detailed investigations of the transmission performance of adaptively modulated optical orthogonal frequency division multiplexed (AMOOFDM) signals converted using reflective semiconductor optical amplifiers (RSOAs) are undertaken over intensity-modulation and direct-detection (IMDD) single-mode fiber (SMF) transmission systems for WDM-PONs. The theoretical RSOA model adopted for modulating the AMOOFDM signals is experimentally verified rigorously in the aforementioned transmission systems incorporating recently developed real-time end-to-end OOFDM transceivers. Extensive performance comparisons are also made between RSOA and SOA intensity modulators. Optimum RSOA operating conditions are identified, which are independent of RSOA rear-facet reflectivity and very similar to those corresponding to SOAs. Under the identified optimum operating conditions, the RSOA and SOA intensity modulators support the identical AMOOFDM transmission performance of 30Gb/s over 60km SMFs. Under low-cost optical component-enabled practical operating conditions, RSOA intensity modulators with rear-facet reflectivity values of >0.3 outperform considerably SOA intensity modulators in transmission performance, which decreases significantly with reducing RSOA rear-facet reflectivity and optical input power. In addition, results also show that use can be made of the RSOA/SOA intensity modulation-induced negative frequency chirp to improve the AMOOFDM transmission performance in IMDD SMF systems.
authors.affiliation: School of Electronic Engineering, Bangor University, Dean Street, Bangor, LL57 1UT, UK.
authors.forename: J L
authors.initials: JL
authors.lastname: Wei
authors.forename: A
authors.initials: A
authors.lastname: Hamié
authors.forename: R P
authors.initials: RP
authors.lastname: Gidding
authors.forename: E
authors.initials: E
authors.lastname: Hugues-Salas
authors.forename: X
authors.initials: X
authors.lastname: Zheng
authors.forename: S
authors.initials: S
authors.lastname: Mansoor
authors.forename: J M
authors.initials: JM
authors.lastname: Tang