Multi-functional optical device utilizing multiple polarization beam splitters and non-linear interferometers

A composite optical signal demultiplexer (DEMUX), comprising:

• a first polarization beam splitter (PBS);
• a non-reciprocal optical rotator (NRR) optically coupled to the first PBS at a face intersecting a main axis of the DEMUX;
• a reciprocal optical rotator (RR) optically coupled to the NRR at a side opposite to the first PBS;
• a second PBS optically coupled to the RR at a side opposite to the NRR;
• a non-linear interferometer (NLI) optically coupled to the second PBS at a side opposite to the RR for reflecting a linearly polarized light comprising a first set of channels and a second set of channels, wherein the first set of channels is reflected without a polarization plane rotation, wherein the second set of channels is reflected with a polarization plate rotation;
• a first optical port optically coupled to the first PBS at a side opposite to the NRR;
• a second optical port optically coupled to a face of the first PBS not intersecting the main axis;
• and
• a third optical port optically coupled to the second PBS at a face not intersecting the main axis.

A system, comprising:

• an optical network, the optical network comprising a composite optical signal;
• and
• an optical device, the optical device comprising:
• a first polarization beam splitter (PBS),
• a set of optical rotators optically coupled to the first PBS at a face intersecting a main axis of the separator, the set of rotators comprising a non-reciprocal optical rotator (NRR) and a reciprocal optical rotator (RR),
• a second PBS optically coupled to the set of optical rotators at a side opposite to the first PBS,
• a non-linear interferometer (NLI) optically coupled to the second PBS at a side opposite to the set of optical rotators for reflecting a linearly polarized light comprising a first set of channels and a second set of channels, wherein the first set of channels is reflected without a polarization plane rotation, wherein the second set of channels is reflected with a polarization plate rotation,
• a first optical port optically coupled to the first PBS at a side opposite to the NRR,
• a second optical port optically coupled to a face of the first PBS not intersecting the main axis, and
• a third optical port optically coupled to the second PBS at a face not intersecting the main axis.