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Crosstalk reduction in a 10-GHz spacing arrayed-waveguide grating by phase-error compensation

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3 Author(s)
Yamada, H. ; NTT Opto-Electron. Labs., Ibaraki, Japan ; Takada, K. ; Mitachi, S.

The crosstalk in arrayed-waveguide grating multiplexers with a channel spacing of 10 GHz is reduced by compensating for the phase errors after fabrication. We used the thermooptic effect realized with a thin-film heater and the photoelastic effect obtained with amorphous silicon film, respectively, for dynamic and static phase-error compensation. These two methods were applied to confirm the principle and to realize a stable, stand-alone device, respectively. We have achieved a crosstalk of less than -35 dB for the TE polarization mode in a 16×16, 10 GHz-spacing arrayed-waveguide grating by using these two phase-error compensation techniques. Static phase-error compensation results in a stable multiplexer which features a low crosstalk of less than -30 dB for one of the two polarization modes of all the channels without any external control equipment

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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 3 )