Session: P3O

munication systems because of their high probability of intercept, and their simultaneous processing of multiple signals in real-timely. They also have many merits such as simple structure, light weight and low cost. Recently, to realize optical transmission system with lager capacity and high-speed, an optical module with high performance, low cost and small size is strongly required. In this paper, we propose a timing extraction circuit as an optical receiver module, in which optical photodetector and SAW filter are monolithic integrated on the piezoelectric substrate. The timing extraction circuit consists of SAW filter and compound semiconductor photodetector such as InP photodiode. We fabricated the timing extraction circuit using film bonding technology. The epitaxial film of the semiconductor photodetector is released from their growth substrate by etching and is bonded on the LiTaO3 substrate using a water glass as an adhesive material. Then, we formed electrodes of the photodetector and interdigital transducer (IDT) eletrodes of SAW filter. Where, the electrode pattern of photodetector and IDT are desgined to be same. We measured basic characteristics of the test circuit. When modulated optical puls signal is received by photodetector, the electrical signal outputed at photodetector can directly induced IDT of input port, the timing extraction signal is obtained at IDT of output port. We discussed the method of timing extraction of signal with high efficiency, quantum efficiency of the photodetector and induced efficiency for different piezoelectric substrates, electrodes configuration of IDT and structure of photodetector, and give optimum circuit parameters.