High-speed digital Y-branch switch/modulator with integrated passive tapers for fibre pigtailing

摘要

A 1/spl times/2 digital optical switch in InGaAsP multiple-quantum-wells with an 8 GHz bandwidth is demonstrated, which may also be operated as a wavelength-, polarisation-, and drive-voltage insensitive modulator. The total length of the switch/modulator device is 3 mm which includes passive fan-outs for fibre interconnection. The on-chip insertion loss is 3 dB out of which the Y-branch excess loss is only 0.7 dB. The measured switch crosstalk is -18 dB for a 4 V push-pull bias. Further crosstalk reduction is expected from a more optimised design and improved fabrication processes.