Dual polarization optical mixerCompared with the current practical intensity modulation/direct detection incoherent communication system, coherent communication system has the advantages of high receiving sensitivity, long relay distance, good wavelength selectivity, large communication capacity, and flexible application. It is an important research direction for high-capacity and high bit rate laser communication systems, especially in inter satellite laser communication systems.

Dual polarization optical mixerAs one of the core components of coherent optical communication terminals, optical bridges link signal lasers and local oscillator lasers to photodetectors and generate the required phase relationship for subsequent coherent detection information processing. Their performance greatly affects coherent reception performance.
Single polarization optical bridge (optical hybrid)Using four 90 ° phase shifts (2 * 4 90 ° optical hybrid, 2 * 4 90 ° phase shifted optical bridge), interference is generated between the signal laser and the local oscillator (LO) laser to extract phase and amplitude information of a single polarization signal. By using two single polarization optical bridges, a dual polarization optical mixer is formed to achieve the same function.
Single polarization optical hybrid enables to extract phase and amplitude from a single polarisation signal by performing four 90 ° phase stepped interferences between the signal and the Local Oscillator (LO).Based on two single polarization optical hybrids, dual polarization optical hybrid achieves the same functionality on both polarizations.
Dual polarization optical mixerThe working wavelength can be customized according to usage requirements, including 808nm, 1064nm, 1310nm, 1550nm, etc.

Dual polarization optical mixerThe schematic diagram is shown below:

Dual polarization optical mixeroptical hybridThe parameter list of COH series products (dual polarization optical mixer for coherent optical communication) is as follows