Generation of an orthogonally polarized dual-wavelength optical signal with large wavelength-spacing tunability by using an integrated modulator and a Sagnac loop

Broadband Microwave Signal Processing Enabled by Polarization-Based Photonic Microwave Phase Shifters

“…Therefore, if the two orthogonal linearly-polarized wavelengths can be generated, the polarization-based photonic microwave phase shifter can be easily realized. An intuitional way to generate the two orthogonal linearly-polarized wavelengths is to combine two phasecorrelated optical wavelengths with a polarization beam combiner (PBC) [24]- [26]. One critical problem associated with this method is that the two wavelengths must be spatially separated before the PBC, as shown in Fig.…”