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| Number | Title | Issue Date |
| 6154583 | Optical switch If an optical switch unit configuring an optical switch is implemented by a three-stage circuit, optical amplifiers are arranged on the input and output sides of an optical space switch in a first stage, and the optical space switch and the optical amplif... | 11/28/2000 |
| 6148129 | Broad bandwidth, single mode fiber optic coupler and method of manufacture The present invention provides for a fiber optic coupler of first and second optic fibers formed by a length of the two fibers. The first optic fiber along the length has a different core diameter than that of the second optic fiber. At the both ends of t... | 11/14/2000 |
| 6144780 | Polymer waveguide switch and method An optical switch having a straight waveguide core with a lateral waveguide core extending therefrom. A region of polymer material is disposed in the straight waveguide core to deflect optical waves from the first waveguide core into the lateral waveguide... | 11/07/2000 |
| 6137932 | Apparatus for controlling gain of an optical fiber amplifier and method thereof A method and apparatus for controlling gain of an optical fiber amplifier includes a plurality of optical isolators, an excitation light source, a wavelength division optical fiber coupler, and a special optical fiber. At least one of the optical isolator... | 10/24/2000 |
| 6134361 | Optical multiplexer/demultiplexer The present invention is related to an optical multiplexer/demultiplexer that has a wide wavelength passing band. This optical multiplexer/demultiplexer includes a substrate formed from a material with a uniform refractive index, a first and a second wave... | 10/17/2000 |
| 6122430 | Optical device and fusion seal An optical device, and a method of producing the device, are disclosed. The device comprises a substrate and an optical waveguide component affixed to the substrate with a glass frit fusion seal formed and locked within a recessed void in the substrate, t... | 09/19/2000 |
| 6122416 | Stacked thermo-optic switch, switch matrix and add-drop multiplexer having the stacked thermo-optic switch Cores of an optical waveguide forming a Y-branch structured thermo-optic switch are stacked in a direction perpendicular to a substrate, and a heater is disposed on a clad right above an area where the cores overlap, thereby utilizing a large temperature ... | 09/19/2000 |
| 6115520 | Compact mach-zehnder interferometer and wavelength reference employing same The present invention includes a MZI comprising a pair of folded waveguides disposed between a pair of couplers. Each folded waveguide comprises a pair of segments intersecting at a reflector. The respective reflectors are different distances from the cou... | 09/05/2000 |
| 6094293 | Optical switching apparatus for use in an optical communication system An optical switch includes a light emitter for emitting light and light receivers. A reflector is used for changing a path of light emitted from the light emitter. The reflector is held by a permanent magnet having first and second magnetic poles of oppos... | 07/25/2000 |
| 6091869 | Low loss, optical add/drop WDM node An add/drop (7) node for an optical fiber network of WDM type has preamplifiers (19, 21) connected to the input fibers (3, 11). Part of the incoming signal power is tapped off by means of drop couplers or splitters (47, 49) and the tapped-off power is pro... | 07/18/2000 |
| 6084997 | Coupled waveguide structure The coupled waveguide structure comprises first and second rectangular waveguides, disposed closely. The aspect ratio of the first waveguide is substantially inverse in number to that of the second waveguide.... | 07/04/2000 |
| 6081637 | Arrangement for monitoring power of diode-laser-radiation laterally coupled into an optical-fiber A method of monitoring power of laser-radiation laterally coupled from a diode-laser into an optical-fiber is disclosed. An input-end of the optical-fiber has a polished surface inclined at an angle to a longitudinal axis of the fiber. The input-end of th... | 06/27/2000 |
| 6081634 | All-fiber optically-controlled optical switch The present invention is an optical switch that includes a first optic fiber waveguide, a second optic fiber waveguide, and a third optical waveguide. The three waveguides are in the same plane. The third optical waveguide may be an optic fiber or a slab ... | 06/27/2000 |
| 6072925 | Optical integrated nodes, and optical communication systems and networks using the optical integrated nodes An integrated optical node includes a main waveguide, a sub-waveguide, a fixed-wavelength type optical coupler and a tunable type optical coupler. On the sub-waveguide, an optical receiver may be formed to detect light guided from the main waveguide to th... | 06/06/2000 |
| 6069752 | Replaceable laser and modulator unit A replaceable modular opto-mechanical unit includes a light source in the form of, for example, a laser assembly; an optical modulator assembly which modulates light from the light source; and a lens located in a light path between the light source and th... | 05/30/2000 |
| 6064506 | Optical multi-channel separating filter with electrically adjustable photon crystals An optical multipath switch with electrically switchable photonic crystals. The invention involves the construction of optical multipath switches based on electrically switchable photonic crystals. A filled photonic crystal, switchable electrically and/or by light,... | 05/16/2000 |
| 6061481 | Optoelectronic circuit The invention concerns optoelectronic circuits for an optical wavelength multiplexing system, the circuits being constructed with optical couplers (11; 39.2, 39.4) each having four branches (1,2,3, 4; 39.1, 39.3, 2×39.5; 2×39.6, 39.3, 39.7). Electrical ... | 05/09/2000 |
| 6052393 | Broadband Sagnac Raman amplifiers and cascade lasers This invention describes new developments in Sagnac Raman amplifiers and cascade lasers to improve their performance. The Raman amplifier bandwidth is broadened by using a broadband pump or by combining a cladding-pumped fiber laser with the Sagnac Raman ... | 04/18/2000 |
| 6046854 | Multi-path interference filter with reflective surfaces An interference filter (10, 30, 50, 70, 90, 110, 130, 150, or 190) filters selected wavelengths by dividing an input beam into two or more intermediate beams having different optical path lengths and by recombining the intermediate beams into an output be... | 04/04/2000 |
| 6047097 | Optical coupler An optical coupler including optical fibers having gaps between first coverings and second coverings corresponding thereto. Each cladding of the two optical fibers is formed into a proper shape, with a taper of a proper thickness. The two optical fibers a... | 04/04/2000 |
| 6044192 | Waveguide pair with cladding A planar waveguide structure has, supported on a lower refractive index buffer layer (5), a pair of optical cores (1, 2) that, over at least a portion of their length, are closely spaced. These cores are covered with a layer (6) of cladding material compr... | 03/28/2000 |
| 6041152 | Multi-channel fiber optic communications system and multiplexer/demultiplexer arrangement therefor In a fiber optic communications system in which channel insertion and removal is carried out by a plurality of modular cascaded multiplexer and demultiplexer components, the respective common outputs and inputs of the multiplexer and demultiplexer compone... | 03/21/2000 |
| 6038359 | Mode-routed fiber-optic add-drop filter New elements mode-converting two-mode grating and mode-filtering two-mode coupler are disclosed and used as elements in a system for communications, add-drop filtering, and strain sensing. Methods of fabrication for these new two-mode gratings and mode-fi... | 03/14/2000 |
| 6031945 | Low-loss optically active device and manufacturing method therefor A low-loss optically active device is provided by forming a lower clad layer using linear polymer on a substrate capable of transmitting ultraviolet (UV) light, forming a non-linear polymer core region of a waveguide region; forming a linear polymer core ... | 02/29/2000 |
| 6031952 | Broadband coupler An input light beam is deflected by a totally reflective surface of a corner prism towards another surface of the prism which is coated by a partially reflective coating. A predetermined percentage of the input power is reflected by this coating and the r... | 02/29/2000 |
| 6026205 | Compound optical waveguide and filter applications thereof A compound waveguide device having a channel waveguide in optical proximity to an elongate waveguide propagating an optical signal therein is disclosed. The channel waveguide includes a coupling surface through which optical energy is evanescently coupled... | 02/15/2000 |
| 6021237 | All-fiber acousto-optic tunable filter This invention relates to an all-fiber acousto-optic tunable wavelength filter which is useful in optical communications or optical fiber sensor systems. The present invention provides an all-fiber acousto-optic tunable filter, comprising: a length of opt... | 02/01/2000 |
| 6016374 | Optical fiber communications system with adaptive data equalizer In accordance with the present invention, an optical fiber communications system is provided with an adaptive data equalizer to correct for linear disortion of signals transmitted over optical fibers. A feedback signal from a receiver is used to custom ta... | 01/18/2000 |
| 6014389 | Fiber-based continuous wave blue laser source A compact, continuous-wave blue laser is developed from a fiber made from heavy metal fluorides ("ZBLAN") doped with a rare-earth ion. The footprint required to create blue laser light is reduced because the fiber can be wound into spools of radius | 01/11/2000 |
| 5987196 | Semiconductor structure having an optical signal path in a substrate and method for forming the same A semiconductor layer is disposed on an opaque substrate, and first and second circuits are respectively disposed in the semiconductor layer or in the substrate. An optical signal path is disposed in the substrate beneath the semiconductor layer and is co... | 11/16/1999 |
| 5982964 | Process for fabrication and independent tuning of multiple integrated optical directional couplers on a single substrate A method of fabricating an optical device incorporates two different techniques for formation of different structures of the device on the same substrate. Individual processes such as Titanium indiffusion and annealed proton exchange in LiNbO3 ... | 11/09/1999 |
| 5978533 | Optical part fixing chip An optical part fixing chip in accordance with the present invention comprises: a guide trench bored in a substrate and having one end thereof abutted on one side of the chip; and a stepped area abutting on one end of the guide trench and extending along ... | 11/02/1999 |
| 5974211 | Enhanced collection efficiency fiber-optic probe A fiber-optic probe uses imaging optics between the remote ends of the excitation and collection fibers and the sample under investigation to enhance working distance and efficiency. In one embodiment a plurality of collection fibers are disposed circumfe... | 10/26/1999 |
| 5970188 | Method and apparatus for controlling an optical signal The invention is a method and apparatus that provides for the control of optical signals in a polarization-independent manner using birefringence. The invention includes an optical coupler connected to a birefringence element by an optical path loop. The ... | 10/19/1999 |
| 5953353 | Article comprising an improved rare earth-doped optical fiber laser At least some rare earth-doped optical fiber lasers are subject to self-pulsing and/or relatively high noise. We have found that these shortcomings can be eliminated if the cavity length of the fiber laser is increased, typically by inclusion of a length ... | 09/14/1999 |
| 5943457 | Generalized resonant coupler filters A signal processing circuit, the signal processing circuit comprising first and second waveguides, a series of successive couplers Ci between the first and second waveguides, the couplers being spaced from each other along the first and second ... | 08/24/1999 |
| 5937119 | Line branching device for branching a conductor string For a line branching device for branching a conductor string it is proposed that an approximately T-shaped housing be provided and the conductor string be guided uninterruptedly through the upper crosspiece of the T-shaped. At the base of the T there is p... | 08/10/1999 |
| 5926599 | Optical device and fusion seal An optical device, and a method of producing the device, are disclosed. The device comprises a substrate and an optical waveguide component affixed to the z, substrate with a glass frit fusion seal formed and locked within a recessed void in the substrate... | 07/20/1999 |
| 5923684 | Fiber amplifier with multiple pass pumping An optical fiber amplifier is pumped by a fiber pump laser which has a pair of separate active media within a common resonator. The fiber gain section of the amplifier is also located within the resonator.... | 07/13/1999 |
| 5915050 | Optical device An optical device comprises an optical fiber directional coupler having at least a first optical fiber optionally coupled at a coupling region to a second optical fiber such that light can propagate in the coupling region in at least two possible electrom... | 06/22/1999 |
