of EP0511435An optical two-way transmission-receiver communications system utilizing a coaxial coupler in place of a standard coupler, the optical system being capable of operation either in a single or multiple wavelength mode by designing the coupling region to have the proper length (i.e., either in 3dB or WDM operation), and further comprising a transmitter and a detector adjacent a coaxial coupler. The detector of the system is provided with a hole in its center in order to allow the transmitter access to the core waveguide of the coaxial coupler. The coaxial coupler may be formed from a rod in tube structure with a core waveguide extension adjacent the Tx/Rx and an integral pigtail on the opposite side of the coupler.

Optical communications systems making use of a coaxial coupler

Simultaneous bidirectional transmission of light signals via an optical fibre termination along a fibre coupled to the termination is achieved. The method includes directing outgoing signals into the fibre via a first region of the termination and receiving incoming signals from the fibre via a second region of the termination. There is an optical transceiver device, including an optical fibre stub, whereby the device may be coupled to an optical fibre. The device has a relatively high refractive index core and a relatively low refractive index region surrounding the core, a light source coupled to the core, and a light detector coupled to the low index region. The detector is disposed adjacent the low index region of the fibre stub and is provided with an aperture in register with the core. The aperture provides a path for light signals directed from the source through the core.

Fibre optic bidirectional transmission systems - has optical transceiver terminal including fibre stub with high refractive index core and low refractive index cladding

Alan George Palmer

Papers

Fibre optic bidirectional transmission systems - has optical transceiver terminal including fibre stub with high refractive index core and low refractive index cladding