Abstract: A fiber distribution frame includes a fixture having a plurality of modules mounted side-by-side within said fixture with each of the modules being individually mounted in a line of travel. Each of the modules can be locked in any one of a plurality of discrete positions within the line of travel. Each of the modules contains a plurality of adapters for receiving and retaining fiber optic connectors. Further, the fixture may be tilted downwardly to provide access to the rear of the fixture.

Abstract: Disclosed is a single mode optical waveguide fiber which limits nonlinear effects at both the 1300 nm window and the 1550 nm window of operations. Examples of core region refractive index profiles which yield the required properties are a modified step index profile and profiles which have a maximum .DELTA.% which is spaced apart from the centerline of the waveguide fiber.

Abstract: An intrusion-alarmed optical fiber communication system, where light from two or more sources are launched with a planar channel waveguide launcher into two or more modes of a multimode graded-index transmission fiber, is disclosed. Input fibers containing the source light waves and the output fibers are in direct contact with the waveguide channels. Waveguide channels redistribute the light from input channels to output channels by rerouting, crossing, merging, or splitting channels. Waveguide launcher precisely launches data light into the fundamental mode and intrusion monitor light into high order modes of a multimode graded-index fiber. Fiber intrusion attenuates light in high order modes, but much less of the data in the fundamental mode, thereby forming a basis for the intrusion-alarmed system.

Abstract: A wavelength tunable, semiconductor laser includes a gain region, e.g., a flared amplifier region, that permits light propagation with a diverging phase front along at least a portion of the gain region. Optical feedback defines a resonant laser cavity that has a first reflector at a first end of the cavity a second reflector at a second end of the cavity for reflecting at least a portion of the light back propagating in the cavity back into the cavity. Wavelength tuned selection, such as through orientation of a grating reflector or via a prism, is provided in the resonant laser cavity for producing a relatively lower optical loss in the cavity to a selected wavelength or a band of wavelengths of the light propagating within the cavity relative to other nonselected wavelengths such that stable laser oscillation is established at the selected wavelength or band of wavelengths.

Abstract: A semiconductor laser having a light amplifying diode heterostructure with a flared gain region in an external resonant cavity. The flared gain region has a narrow aperture end which may be coupled to a single mode waveguide and a wide output end. A light emitting surface of the heterostructure proximate to the wide end of the flared gain region is partially reflective and combines with an external reflector to form a resonant cavity that is effectively unstable. The intracavity light-emitting surface proximate to the narrow aperture end is antireflection coated. The external reflector may be a planar mirror or a grating reflector. A lens or an optical fiber may couple the aperture end of the flared gain region to the external reflector. Frequency-selective feedback is provided by orienting the grating reflector or providing a prism in the cavity in front of the external planar mirror. Other filtering elements may also be placed in the external cavity.

Abstract: The apparatus for forming a hemispherical micro-lens according to the present invention comprises a laser light oscillator 5 for irradiating laser light into one end 3a of an optical fiber 3, a far-field pattern (F.F.P.) detector 6 for detecting the shape of the F.F.P. of laser light emitted from the other end 3b of the optical fiber 3, discharge electrodes 1 for heating the end 3b of the optical fiber 3 and thereby forming a hemispherical microlens, and a discharge controller 2 for controlling the operation of the discharge electrodes 1 according to the shape of the detected F.F.P. With this apparatus, laser light is irradiated into one end surface 3a of an optical fiber 3, the other end surface 3b is heated to form a hemispherical microlens while measuring the F.F.P. of laser light emitted from this end surface 3b, and heating is halted according to the measured value of the F.F.P. It is preferable that the discharge controller 2 halt the heating operation when the diameter of the F.F.P. detected at the F.

Abstract: Apparatus for mode discrimination in laser applications. A laser operating at a wavelength .lambda.c may have an undesired mode operating at .lambda.e. Mirrors are constructed such that the loss induced in the undesired mode by the wavelength centering of at least one of the mirrors exceeds the available gain of the laser.

Abstract: Disclosed is a fiber optic backplane connector in which there are a plurality of axially spaced circuit board engaging spring on one side of the exterior housing. By means of this arrangement a single connector is engageable with a number of thicknesses of circuit board. Also disclosed are two resilient metal arms which extend from a metal plate on one side of the connector to engage the medial flange to enable the connector to be assembled without ultrasonic welding. A method for using this connector to connect fiber optic cables as well as to dissipate static electrical charges therein is also disclosed.

Abstract: An optical waveguide circuit comprises a mode splitter and an input guide (1/4/6.1) and first and second output guides (6.2/2, 6.3/3), and a mode converter (5) incorporated in the input guide for converting a fraction of an optical signal (I.sub.i), entering via the input waveguide, of a first propagation mode into a second propagation mode having mutually different order. The mode converter (5) has a first waveguiding section (5.1) and a second waveguiding section (5.2), which adjoin each other via a single discontinuity (7). The first and second sections (5.1 and 5.2) have propagation modalities, as a result of which, at the discontinuity, a coupling can take place between two propagation modes of different order, whereas the extent (x) of discontinuity determines the fraction of conversion for obtaining a desired splitting ratio in emitting signals (I.sub.o1, I.sub.o2).

Abstract: An optical slip ring for acting as an interface between rotary member and a stationary detector includes a source for generating a light beam directed at a sensor on the rotary member and an optical fiber transmitting said beam to the sensor. The sensor generates in response a sensor signal indicative of a physical parameter of interest. This sensor signal is transmitted through the fiber to an output lens for pick up by a stationary detector.

Abstract: An optocoupler for isolating a high voltage from a low voltage comprising: an elongated light transmissive rod mounted inside a cavity of a housing, the cavity being filled with a fluid surrounding and in contact with an outside wall surface of the rod; a light emitter mounted at one end of the rod, the light emitter receiving a current input and emitting light in response to the input; a light detector mounted at an opposing end of the rod, the light detector having a detection surface receiving light emitted from the emitter and generating a current output signal in response to the received light; the emitter and detector being mounted such that light emitted from the emitter travels through the rod and is directed toward the detector; a portion of the light emitted from the emitter traveling in a path into impingement with the outside wall surface of the rod; the rod having a first refractive index and the fluid having a second refractive index; the outside wall surface of the rod having a selected contour

Abstract: An SDH semiconductor laser has a semiconductor substrate which is (100) oriented and has a stripe ridge thereon, first and second cladding layers disposed on stripe ridge, an active layer sandwiched between the first and second cladding layers, and an electrode held in electric contact with the first and second cladding layers and the active layer. The stripe ridge extends in a <01-1> axis direction, and the first and second cladding layers and the active layer jointly provide a semiconductor stripe region of triangular cross section sandwiched between (111) A faces. A method of manufacturing the SDH semiconductor laser is also disclosed.

Abstract: An optical connector for coupling an optical fiber cable to another optical fiber cable or optical device. The optical fiber cable has an optical fiber for carrying an optical signal, and it also has a plurality of strain relief members. The optical connector comprises a barrel and ferrule having an optical fiber pre-mounted therein. The optical fiber from the optical fiber cable and the optical fiber are butt-spliced in a central part of the barrel. The optical connector further comprises a connector housing and a cylindrical sleeve member which is slidably mounted over a cable receiving end of the connector housing. The plurality of strain relief members are distributed around the cable receiving end, and the cylindrical sleeve member is guided therearound and then crimped thereon. The cylindrical sleeve member secures the plurality of strain relief members of the optical fiber cable directly to the connector housing.