A 90 degree optical hybrid is a six-port device consisting of two inputs and four outputs. In the ideal case, the outputs are the mixed signals of the inputs with 0, $pi$/2, $pi$, and 3$pi$/2 relative phase shifts. nal to generate four quadratural states in the complex-field space. See the block diagram belo itable for coherent signal demodulation, BPSK or QPSK demodulation. The patent-pending, broadband device accepts. There is provided an optical-electrical hybrid module including a substrate on which a plurality of optical communication modules are arranged, the plurality of optical communication modules transmitting or receiving an optical signal through an optical fiber cable and performing conversion between. Floating Insert on backplane side contains NanoRF contacts and optical mounts Alignment features provide reliable, stub-free mating Supports CableMT and Edge Mount transceivers allowing additional modularity and options for customers Multiple slot profiles and connector modules added to VITA 65. The new hybrid modules feature high-density RF and. Hybrid Digital Optical Module (hDOM), is a newly designed detection unit for the proposed deep-sea neutrino telescope in the South China Sea, TRopIcal DEep-sea Neutrino Telescope (TRIDENT). An hDOM is equipped with multi-PMTs for uniform angular acceptance and additional silicon photomultipliers.