Long range bidirectional optical fiber communication link

Details Long range bidirectional optical fiber communication link Long range bidirectional optical fiber communication link

H - Electricity

04

B

325/1

H04B 10/12 (2006.01) H04B 10/24 (2006.01)

Patent

CA 2040756

ABSTRACT A long-range optical fiber communication link overcoming certain constraints on signal transmission range imposed by fiber-induced loss is disclosed herein. A first embodiment of the communication link (10) of the present invention includes an optical fiber (16) having a first and a second end wherein the attenuation of optical energy passing therethrough at wavelengths included within a transmission window is substantially minimized. The inventive link (10) further includes a first arrangement (22) and (36) for launching a first optical carrier of a first wavelength onto the first end of the fiber (16). Provision is made within the launching arrangement (22) and (36) for impressing a first modulating signal spanning a first frequency spectrum upon the first carrier. The first embodiment also includes a second arrangement (26) and (37) for launching a second optical carrier of a second wavelength onto the second end of the fiber, wherein the second wavelength is included within the transmission window. The second launching arrangement (26) and (37) is further disposed to impress upon the second carrier a second modulating signal spanning a second frequency spectrum segregated from the first spectrum. A first receiver (64) of a first bandwidth encompassing the first frequency spectrum is coupled to the second end of the fiber (16). The first receiver (64) is operative to extract the first modulating signal from the first optical carrier. Similarly, a second receiver (58) having a second bandwidth encompassing the second frequency spectrum is coupled to the first end of the fiber (16). The second receiver (58) is disposed to extract the second modulating signal from the second optical carrier.

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