Abstract
Wavelength multiplexers based on the arrayed-waveguide grating (AWG) principle are fabricated with ion-exchanged waveguides in glass for 1550 nm. The insertion loss is 6 and 4 dB with a cross talk of 15 and 20 dB for 8-channel 50 GHz and 4-channel 100 GHz devices, respectively. The AWGs are almost polarization insensitive because the refractive index profile of the waveguides is nearly concentric and the waveguides are diffused into stress-free glass substrates. The transverse electric transverse magnetic (TETM) shift of the wavelength response is only 0.02 nm (2.5GHz) for an 8-channel 50 GHz AWG. The temperature sensitivity is 1.4 GHz C.
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