Integrated photonic devices with reduced sensitivity to external influences

An integrated photonic device having a wavelength-dependent characteristic for use with an input wave having a first polarization, the device comprising:

• a Splitter Polarization Rotator (SPR) having an input port configured to receive the input wave, a first output port configured to provide a first wave having the first polarization and a second output port configured to provide a second wave having a second polarization different from the first polarization;
• a first waveguide arm having dimensions configured to propagate a first polarization mode of the first wave, an input side of the first waveguide arm being optically connected to the first output port of the SPR;
• a second waveguide arm having dimensions configured to propagate a second polarization mode of the second wave, the second polarization mode being different from the first polarization mode, an input side of the second arm being optically connected to the second output port of the SPR;
• and
• a Polarization Rotator and Combiner (PRC) having a first input port optically connected to an output side of the first waveguide arm and configured to receive the propagated first wave, and a second input port optically connected to an output side of the second waveguide arm and configured to receive the propagated second wave, and an output port for providing the combination of the propagated first wave and the propagated second wave as an output wave having an output polarization;
• wherein the dimensions of the first waveguide arm and the dimensions of the second waveguide arm are selected to substantially cancel out the influence of an external effect on the wavelength-dependent characteristic.