Polarization independent and temperature tolerant AWG based on a silicon nitride platform

A polarization tolerant optical receiver is a key building block for the development of wavelength division multiplexing based high-speed optical data links. However, the design of a polarization independent demultiplexer is not trivial. In this Letter, we report on the realization of a polarization...

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Veröffentlicht in:Optics letters 2020-12, Vol.45 (23), p.6559-6562
Hauptverfasser: Guerber, Sylvain, Alonso-Ramos, Carlos Alberto, Le Roux, Xavier, Vulliet, Nathalie, Cassan, Eric, Marris-Morini, Delphine, Boeuf, Frédéric, Vivien, Laurent
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Sprache:eng
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Zusammenfassung:A polarization tolerant optical receiver is a key building block for the development of wavelength division multiplexing based high-speed optical data links. However, the design of a polarization independent demultiplexer is not trivial. In this Letter, we report on the realization of a polarization tolerant arrayed waveguide grating (AWG) on a 300-mm silicon nitride (SiN) photonic platform. By introducing a series of individual polarization rotators in the middle of the waveguide array, the polarization dependence of the AWG has been substantially reduced. Insertion losses below 2.2 dB and a crosstalk level better than − 29 d B has been obtained for transverse electric and transverse magnetic polarizations on a four-channel coarse AWG. The AWG temperature sensitivity has also been evaluated. Thanks to the low thermo-optical coefficient of SiN, a thermal shift below 12 pm/°C has been demonstrated.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.411332