Abstract: An optical probe suitable for medical or dental tomography is switchable between a rotating and non-rotating mode to control interference between source signals and data signals. The probe is suitably constructed in an in-line configuration and uses Faraday rotators which rotate polarization in the same direction in a rotating mode and rotate polarization in opposite directions in a non-rotating mode.

Abstract: An optical probe suitable for medical or dental tomography is switchable between a rotating and non-rotating mode to control interference between source signals and data signals. The probe is suitably constructed in an in-line configuration and uses Faraday rotators which rotate polarization in the same direction in a rotating mode and rotate polarization in opposite directions in a non-rotating mode.

Abstract: Apparatus and methodology for the low coupling of optical fibers in high power applications. An end of a single mode optical fiber, or a polarization maintaining fiber, is cut and spliced to a relatively short segment of an index matched multi-mode fiber or an optical fiber without cladding (air cladded) having approximately similar diameter as the single mode fiber which in turn is coupled to the external device. The free end of the multi-mode fiber may be cleaved, polished and have an anti-reflection applied to it. The beam emitted by the small core of the single mode optical fiber expands into the larger core of the multi-mode fiber providing low loss high power coupling of the optical fiber to the external device.

Abstract: A compact inline fiber optic polarization splitter/combiner for use in fiber optic communications. The splitter/combiner uses two birefringent wedges aligned with their optical axis at 90° from each other and their bases disposed oppositely to each other. One lens is used at the input to couple light from the input fiber. A single output lens is used to couple light into two adjacent polarization maintaining fibers. When used as a combiner a beam of a first linear polarization state from one input fiber is combined with a beam of second linear polarization state from a second input fiber into a third output fiber carrying both beams. The splitter/combiner also provides for the ready alignment of the input and output beams further saving cost and complexity.

Abstract: Optical polarization maintaining couplers which may be used as a splitter(divider) or a combiner (multiplexer). The couplers utilize a series of partial reflectors disposed in the lightpath between the input fiber and the output fibers. The couplers may be used to form 1 or 2 by N devices with the input and output fibers disposed at right angles to each other forming a compact, efficient polarization maintaining optical coupler.

Abstract: Optical isolators for use in fiber optic networks utilizing a birefringent wedge set with a Faraday rotator disposed between the birefringent wedges. In a first embodiment a polarization maintaining optical isolator is disclosed which will maintain the polarization of the light which passes through it in a forward direction and block light in the reverse direction. In a second embodiment a single polarization optical isolator is disclosed which will pass only a single linear polarization of the light in a forward direction and block any light in the reverse direction.

Abstract: An inline fiber optic polarization combiner/divider is proposed for use in fiber optic communications. It utilizes a polarizing beam splitting cube (PBSC) or a birefringent displacer located between a pair of collimating lenses. A reflecting film (either external or directly applied to one of the faces of the PBSC or birefringent displacer) is used to completely reflect one of the two polarizations and is positioned such that the optical path length between the lens and the reflecting film is equal to one focal length in order to accomplish an optical path where the input and output optical fibers are in-line with the package.

Abstract: Inline optical circulators utilizing birefringent displacers to split an incoming beam into two orthogonally polarized beams and thereafter to recombine the beams. The birefringent displacers are used in combination with non reciprocal devices (Faraday rotators), reflectors and waveplates and serve to route a signal serially to the next port. Specific embodiments utilize birefringent wedges which provide circulators with reduced component counts and simplified alignment of the components. Circulators which do not utilize waveplates, and thus are relatively wavelength insensitive, are also described.

Abstract: Polarization maintaining optical circulators for fiber optic applications. A first embodiment uses birefringent wedges and Faraday rotators in an inline configuration. The second embodiment utilizes a polarizing beam splitting cube and Faraday rotators which results in a design with the fibers being at either 90° or 180° with respect to each other, all in the same plane. A third embodiment makes use of a polarizing beam splitter cube and Faraday rotators with a reflector on one or both of the sides of the beam splitting cube which provides an device.

Abstract: An inline fiber optic polarization combiner/divider is proposed for use in fiber optic communications. It utilizes a polarizing beam splitting cube (PBSC) or a birefringent displacer located between a pair of collimating lenses. A reflecting film (either external or directly applied to one of the faces of the PBSC or birefringent displacer) is used to completely reflect one of the two polarizations and is positioned such that the optical path length between the lens and the reflecting film is equal to one focal length in order to accomplish an optical path where the input and output optical fibers are in-line with the package.

Abstract: Optoelectronic device with a coupling between an optoelectronic component, in particular a semiconductor diode laser, and an optical glass fiber, and method of manufacturing such a device.The invention relates to an optoelectronic device (10) with a coaxial module which comprises a first holder (2) and a second holder (6) fastened thereto, in which holders are present an optoelectronic component (3), preferably a semiconductor diode laser (3), hermetically sealed off from the surroundings outside the module (1), and a glass fiber (7) aligned therewith, respectively. Conductors (22), for example connection pins (220) to which the component (3) is connected, project from the module (1). Such a module (1) forms a reliable and effective component-glass fiber coupling and is suitable for use in optical glass fiber communication systems. The invention also relates to a method of manufacturing such a device (10).

Abstract: The invention relates to an optoelectronic device comprising a semiconductor laser enclosed in an envelope, an optical fibre coupled to the semiconductor laser, and further coupled to at least one optical isolator and an outgoing optical fibre (pigtail). According to the invention, the semiconductor laser and the optical isolator are each enclosed in a separate module. The laser module mainly provides space to the semiconductor laser and to an optical fibre coupled thereto and ending in a ferrule in a tubular projection of the laser module. The module for the optical isolator is tubular in shape and contains in that order a first graded index lens, an optical isolator, a second graded index lens, and an outgoing optical fibre (pigtail) coupled to this second graded index lens through a ferrule.

Abstract: An optoelectronic device with a coupling is provided, comprising a lens (10), between an optical transmission fiber (13) and a semiconductor laser diode (2), which device is provided with a holder (1) for the laser diode, a holder (12) for the optical transmission fiber and an intermediate piece (16) present between these two holders, the spherical lens (10) being accommodated in the cover (9) of the holder (1) of the laser diode (2), while the holder (12) of the transmission fiber contains a hollow glass rod (14) in which a core portion (11) of the transmission fiber is accommodated, the end (15) of the glass rod and the fiber core being flat and polished, while the intermediate piece (16) has a sleeve shape and slides with exact fit over the cover (9) of the holder of the semiconductor laser diode (2), which sleeve-shaped intermediate piece has two grooves spaced some distance apart, at which grooves the intermediate piece and the cover of the holder of the semiconductor laser diode are fastened to one anot