Multiple-quantum-well Mach-Zehnder modulators: Comparison of calculated and measured results for modulator properties and system performance

Improving the performance of three level code division multiplexing using the optimization of signal level spacing

“…These functions entail the attenuation and phase constants of an optical signal which is broadcasted in the modulator waveguide. To this end, these constants along with the device structure are able to specify the extinction ratio as well as the chirp related to the modulated optical signal [12]. It needs to be asserted that for the purpose of gaining a proper quantity of negative chirp as well as earning a high extinction ratio and consequently boosting the transmission performance, a voluminous extent of research has been hitherto conducted so that the modulator waveguide's composition and structure will be enhanced.…”

The study of multilayer planar optical waveguide structure with nonlinear cladding

“…Until now, the published papers have dealt with structures where either a nonlinear film was sandwitched between both a linear substrate and cladding or two nonlinear films embedded among three linear media or a linear film was bounded by one or two nonlinear media (Boardman and Egan 1986;Kang 2000;Ma and Wolff 1996;Micallef et al 1998;Rozzi 1996;Seaton et al 1985). Within the past several years, it became evident that multilayer systems as multiple quantum well structures exhibit the optical nonlinearities accompanied by very fast response time (Hamilton et al 1996;Cartledge 2003).…”

“…The multilayer structures have been extensively used in the multiple-quantum-well waveguides (Hamilton et al 1996;Cartledge 2003) and the multibranch structures have also been designed to operate as all-optical photonic devices (Low et al 2004;Wu 2005Wu , 2006. The transfer matrix method (TMM) can be used to solve the regular and periodical multilayer structures such as the distributed feedback and the distributed Bragg structures.…”