160GHz to 20GHz variable rate RZ and CS-RZ pulse trains generation based on phase and attenuation tunable high-resolution AWG, and its application to photonic networks - art. no. 60281R

We developed an optical spectrum synthesizer based on high resolution synthesized arrayed wave-guide grating (AWG) which consists of 32 ports AWG with 20GHz spacing, tunable attenuators, optical phase shifters, and mirror. All components are integrated by planer light-wave circuit (PLC) technology. It can tune amplitude and phase of each spectrum mode of pulse train. Tuning time is within 3 ms. Optical signal inputs from an In/Out port and divided into 20GHz spacing spectral components. Amplitude and optical carrier phase are tuned by attenuators and phase shifters, respectively. Optical attenuator is a PLC based Mach-Zehnder interferometer with heater. Optical phase shifter is a wave-guide with heater. In this paper, 160GHz to 20GHz variable rate return to zero (RZ) and carrier suppressed return to zero (CS-RZ) pulse trains generation are experimentally demonstrated. Pulse by pulse optical phase shift either "0" or "pi" of generated CS-RZ pulse train is verified by test experiment. All optical pulse reshaping of 20GHz distorted pulse is also shown. Spectrum domain matched filtering for optical code division multiplexing (OCDM) and optical label switching is shown experimentally. Other possibility of PLC based all-optical label processing and their application to ultra-high speed and scalable photonic networks are expressed in detail.