Polarization-maintaining fibers work by intentionally introducing a systematic linear in the fiber, so that there are two well defined polarization modes which propagate along the fiber with very distinct phase velocities. The beat length Lb of such a fiber (for a particular wavelength) is the distance (typically a few millimeters) over which the wave in one mode will experience an additional delay of one wavelength compared to the other polarization mode. Thus a length Lb /2 of such fiber is equivalent to a.
Our QSFP28 Bidirectional (Bidi) transceivers delivers high-speed 100G connectivity over a single strand of fiber, with reach options up to 70km and support for both standard and industrial temperature environments. ZR4 BiDi, using four. The RAD patented BiDi miniature passive adaptor fits any QSFP/SFP transceiver to perform a simple dual to single bi-directional fiber connectivity. They do this by using Wavelength Division Multiplexing (WDM) to carry upstream and downstream signals at different wavelengths on the same fiber.
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