A Ti:LiNbO_3 Optical Modulator With A Large Band-width

概要

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High speed Ti:LiNbO_3 optical modulators are being developed. Further improvement of the bandwidth of the fully connectorized modulators is needed in achieving very high speed communication systems in near future. So far, the practically realized fully connectorized modulator is needed to a bandwidth of 25 GHz (3-dB, electrical or 1.5-dB, optical). In our previous work, we reduced some of the major factors of the microwave attenuation (the strip line conductor loss, loss due to higher order mode propagation, loss due to strip line bends and tapers, impedance mismatch loss etc.) to a large extent. We found that the loss due to mounting package (connector, design of the chip feeder part, contact between them and grounding), is a major factor which limits the bandwidth above 25 GHz, besides the dielectric loss. We reduced these factors to a large extent and discuss the results of a fully connectorized Ti:LiNbO_3 optical modulator, with bandwidth of more than 32 GHz.
社団法人電子情報通信学会の論文
1997-03-06