Optical BridgeCompared 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.

Optical BridgeAs 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.
COH24 optical hybrid bridgeUsing four 90 ° phase shifts (2 * 4 90 ° optical hybrid), interference is generated between the signal laser and the local oscillator (LO) laser to extract phase and amplitude information of a single signal.
COH24 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).

Optical BridgeThe working wavelength can be customized according to usage requirements, including 808nm, 1064nm, 1310nm, 1550nm, etc.

The structure diagram of 2 * 4 90 ° phase optical hybrid (2 * 4 90 ° phase shifted optical bridge) is shown below:

Optical BridgeThe parameter list of COH series products for optical hybrid (coherent optical communication optical bridge) is as follows