Abstract: An apparatus and method for detecting a chemical substance by exposing an optic fiber having a core and a cladding to the chemical substance so that the chemical substance can be adsorbed onto the surface of the cladding. The optic fiber is coiled inside a container having a pair of valves for controlling the entrance and exit of the substance. Light from a light source is received by one end of the optic fiber, preferably external to the container, and carried by the core of the fiber. Adsorbed substance changes the transmissivity of the fiber as measured by a spectrophotometer at the other end, also preferably external to the container. Hydrogen is detected by the absorption of infrared light carried by an optic fiber with a silica cladding. Since the adsorption is reversible, a sensor according to the present invention can be used repeatedly.

Abstract: An optical isolator having three or four birefringent crystals and two magneto-optic elements is disposed between two light waveguides to prevent reverse-directed light from returning to the light waveguide on the light-source side. Forward-directed light emitted from the light waveguide on the light-source side is allowed to properly enter into the other light waveguide, whereas the reverse-directed light returning reflectively toward the light waveguide on the light-source side is separated into two polarized component and undergoes polarization rotation while propagating in the optical isolator, to thereby advance out of the optical axis of the light-source side light waveguide.

Abstract: An interconnect assembly 1 includes an adapter assembly 15, a coupling bushing 13 and an insert 14. The assembly 1 is situated within a wall outlet 2 having a hood assembly 4 with an aperature 8 for receiving therethrough a plug terminated optical fiber cable. The plug is received through the aperture 8 and interconnected by means of the interconnect assembly 1 with a second optical fiber cable. The assembly 1 comprises a receptacle housing 18 having at least one forward extending compartment structure 46, open at a front receiving face and a receptacle 17 within the housing 18 for receiving the first optical cable within the compartment structure 46 for connection to the plug terminating the first optical fiber cable. The assembly 1 further comprises an insert 13 with a guide port 56. The guide port 56 receives the forward extending compartment structure 46 of the receptacle housing 18 with the receptacle 17.