Abstract
We present a wavelength duplexer based on a compact arrayed waveguide grating (AWG) in silicon-on-insulator photonic wire waveguides. Polarization insensitive operation is achieved through a special polarization diversity approach in which we use 2-D grating fiber couplers as integrated polarization splitters. To mitigate the effects of process variations, we propagated both polarizations in opposite directions through the same AWG with a mere 600x350microm(2) footprint. This resulted in an on-chip insertion loss between -2.1dB and -6.9dB, crosstalk of -15dB, and only 0.66dB polarization dependent loss. This is the first demonstration of a functional polarization-diversity circuit implemented in SOI nanophotonic waveguides, including interfaces to single-mode fiber.
Highlights
Silicon-on-insulator (SOI) photonic wires are very well suited to implement wavelengthselective functions in a very compact way [1, 2, 3]
We present a wavelength duplexer based on a compact arrayed waveguide grating (AWG) in silicon-on-insulator (SOI) photonic wire waveguides
We have demonstrated the first polarization-diversity circuit in SOI nanophotonic waveguides, in the form of a very compact, polarization-independent wavelength duplexer
Summary
Silicon-on-insulator (SOI) photonic wires are very well suited to implement wavelengthselective functions in a very compact way [1, 2, 3]. We present the first demonstration of an application-oriented, functional polarizationdiversity circuit based on a compact 2-D fiber coupler grating, which functions as a polarization splitter [8, 9] This allows us to implement a wavelength duplexer for a low-cost fiber access network using a very compact arrayed waveguide grating (AWG). We designed the circuits in such a way that both polarizations make use of the same wavelength-selective element by traveling through the AWG in opposite directions. This results in a polarization dependent loss (PDL) of only 0.66 dB.
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