Improved Optical Communications with Significantly Reduced Cost using Polarization Diversity Transmission

Technology #30901

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Fig 1. Block diagram of a communication system including an embodiment of a system and method of polarization time coding for optical communicationsFlowchart describing operation of one embodiment of the optical transmitter from FIG. 1.Block diagram of the optical transmitter of FIG. 50 1, showing further details of the operation of the polarization time encoder from FIG. 1Block diagram of the optical receiver of FIG. 1, showing further details of the operation of the polarization time decoder from FIG. 1Block diagram of selected components of the transmitter and receiver from FIG. 1, showing further details of the optical componentsHardware block diagram of a computing device which can be used to implement various embodiments systems and methods of polarization time coding for optical communications
Guifang Li, Ph.D.
Yan Han
Patent Protection

Systems and methods of polarization time coding for optical communications

US Patent 8,213,795 B2

Novel system and method for improving optical communications using transmission polarization diversity to reduce impairments in fiber transmissions.

UCF scientists have developed a novel and less costly system and device, to improve optical communication using polarization redundancy. The overall system is less complex than previous systems, since it uses simplified receivers, simple digital coding and signal processing.

Technical Details

Optical signals can degrade during transmission, significantly hindering the efficient transfer of data. A variety of strategies are therefore used to recover the unimpaired signal. Signal redundancy, obtained by using multiple transmitters and receivers is one such technique. The multiple receivers provide data redundancy (or diversity). They can also accurately reconstruct degraded signals by exploiting the differences in the versions of received data. Some of these multiple input, multiple output (MIMO) systems, use several antennas, while others use polarization to generate the redundancy. Diversity in polarization information helps to overcome impairments from optical fibers and scattering, which occurs in free-space communication. Although these techniques may be effective they require multiple transmitters and receivers, significantly increasing the cost of the system.


  • Reduces the cost in of a point- to- multiple point network
  • Significantly reduces optical non-linearity-induced impairments
  • Improves overall reliability of optical communication


  • Optical communications and networking
  • Capability to overcome the impairments of optical fiber transmissions and free-space communication