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The last mile or last kilometer is a phrase widely used in the telecommunications, cable television and internet industries to refer to the final leg of the telecommunications networks that deliver telecommunication services to retail end-users (customers). More specifically, the last mile means the portion of the telecommunications network chain that physically reaches the end-user's premises. Examples are the copper wire subscriber lines connecting landline telephones to the local telephone exchange; coaxial cable service drops carrying cable television signals from utility poles to subscribers' homes, and cell towers linking local cell phones to the cellular network. The word "mile" is used metaphorically; the length of the last mile link may be more or less than a mile. Because the last mile of a network to the user is conversely the first mile from the user's premises to the outside world when the user is sending data, the term first mile is also alternatively used.

Dual-polarization-state dual-binary optical access system fusing optical fiber link and free space optical communication channel

ActiveCN110138454ANo added complexityPolarisation multiplex systemsFibre transmissionHigh bandwidthEngineering

The invention discloses a dual-polarization-state dual-binary optical access system fusing an optical fiber link and a free space optical communication channel. According to the system, a polarizationmultiplexing technology and a dual-binary modulation mode are adopted to generate an optical dual-polarization state dual-binary (DP-DB) signal at a transmitting end, and the signal is transmitted through a 50km single-mode optical fiber (SMF-28) and a 100m free space wireless optical communication (FSO) channel at the rate of 10Gb/s. Compared with a conventional optical access system scheme, thetest results prove that the DP-DB optical fiber access system provided by the invention has the access advantages of an optical fiber link and a free space downlink at the same time, can provide theaccess with high bandwidth efficiency and support the direct detection of the optical signals after polarization demultiplexing, and can be applied to the last kilometer area which is not beneficial to optical fiber transmission.

Dual-polarization-state dual-binary optical access system fusing optical fiber link and free space optical communication channel

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Owner:CHONGQING THREE GORGES UNIV

1 results about "Last mile" patented technology

Dual-polarization-state dual-binary optical access system fusing optical fiber link and free space optical communication channel

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