Optical waveguide multiplexer

Apparatus, comprising:

• polarity beam splitter (PBS), disposed upon a substrate, for splitting received optical signal into a first polarization mode optical signal and a second polarization mode optical signal;
• a first initial filter structure, disposed upon the substrate, for broadband filtering the first polarization mode optical signal to provide a plurality of first polarization mode filtered optical signals at respective outputs;
• a second initial filter structure, disposed upon the substrate, for broadband filtering the second polarization mode optical signal to provide a plurality of second polarization mode filtered optical signals at respective outputs;
• a third filter structure, disposed upon the substrate, for broadband filtering a first polarization mode filtered optical signal associated with a first wavelength group of interest to provide a plurality of first polarization mode filtered optical signals at respective outputs;
• a fourth filter structure, disposed upon the substrate, for broadband filtering a second polarization mode filtered optical signal associated with a first wavelength group of interest to provide a plurality of first polarization mode filtered optical signals at respective outputs;
• a first photo detector, disposed upon the substrate and optically coupled between a third filter structure output and a fourth filter structure output, for detecting optical signal at a first wavelength;
• and
• a second photo detector, disposed upon the substrate and optically coupled between a third filter structure output and a fourth filter structure output, for detecting optical signal at a second wavelength.

Apparatus, comprising:

• polarity beam splitter (PBS), disposed upon a substrate, for splitting received optical signal into a first polarization mode optical signal and a second polarization mode optical signal;
• a first lattice filter, disposed upon the substrate, for broadband filtering the first polarization mode optical signal to provide a corresponding pair of first polarization mode filtered optical signals;
• a second lattice filter, disposed upon the substrate, for broadband filtering the second polarization mode optical signal to provide a corresponding pair of second polarization mode filtered optical signals;
• a PIN photo detector, disposed upon the substrate, for detecting optical signal at a first wavelength within the filtered first and second polarization mode optical signals;
• and
• an APD photo detector, disposed upon the substrate, for detecting optical signal at a second wavelength within the filtered first and second polarization mode optical signals.