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Programmable Coupler Ladder Based on Lithium Niobate Y-Junction Reflector
Jianxiao CHEN Tetsuya KAWANISHI Kaoru HIGUMA Satoshi SHINADA William S.C. CHANG Masayuki IZUTSU Paul K.L. YU
IEICE TRANSACTIONS on Electronics
Publication Date: 2005/03/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Optical Signal-Processing Devices for Photonic Networks)
lithium niobate, splitter, coupler ladder, loop resonator,
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This paper presents a proposal for a novel integrated tunable coupler device called programmable coupler ladder, based on Titanium diffused lithium niobate waveguide and Y-junction reflector. Unlike the traditional serial to parallel converter, the coupler ladder sorts the output bits in the time axis using a built-in delay waveguide. With a proper control signal it can perform signal processing at the bit level. It also can generate coherent multi-channel outputs with theoretically arbitrary amplitude and phase from continuous input light source. Its application in optical microwave beam forming is briefly described. The key component, built-in delay line based on Y-junction reflector, has been experimentally verified via a loop resonator structure. 1 dB loss is found for each Y-junction reflector, which enables a practical coupler ladder. The loop itself is also an important device for optical signal processing.