Class 398/134 - Including optical fiber or waveguide

Subclass of Class 398 - Optical communications
Definition: Subject matter wherein the transdu cer either is connected
No. of patents: 36
Last issue date: 10/02/2007

Number	Title	Issue Date
7277642	Fine displacement detection device by sound or the like A fine displacement detection device by sound or the like: which can easily align individual optical components; which disposes a light emitting element (13) and a light receiving element (14) on a substrate, emits light from the light emitting element...	10/02/2007
7274855	Optical micro-actuator An optically driven actuator, such as a microactuator, is provided in which light is used to cause linear or angular mechanical or micromechanical motion. The actuator includes a solid light-absorbing and expanding member having an internal partially absorbing and p...	09/25/2007
7272976	Pressure sensor A pressure gauge includes a diaphragm having a substantially rigid outer portion and a displaceable inner portion that displaces in response to a pressure difference between first and second sides of the diaphragm. The pressure gauge further includes a sensor locate...	09/25/2007
7257327	Wireless communication system with high efficiency/high power optical source An optical communication system is provided which includes an optical signal transmitter which communicates high bandwidth, high power frequencies. The optical signal transmitter includes a high efficiency/high power optical source such as an optical magnetron or a ...	08/14/2007
7215383	Coherent light despeckling A display device or a receiver device for use with coherent light. A controller applies phase shift values to a multi-region phase array at a frequency sufficiently higher than the flicker fusion rate of the human eye or other intended receiver in order to remove th...	05/08/2007
7082269	Interface circuit for a fiber transceiver The present invention discloses an interface circuit for a fiber transceiver, comprising: an encoder, for receiving and encoding an input data into an output differential signal; a comparator, for receiving an input differential signal from the fiber transceiver and...	07/25/2006
7079717	Control circuit for IEEE 1394b optical transmission protocol An On-Off control circuit between the IEEE1394a and IEEE1394b compliant physical layer (PHY) output driver circuitry and the glass fiber optical physical medium dependent (PMD) sub-layer within the architecture of the IEEE 1394b standard addresses the stability issu...	07/18/2006
7072475	Optically coupled headset and microphone Apparatus and methods for transferring audio between a headset and electronic equipment over an optical link. The apparatus includes an electro-optical interface for electrically connecting to the electronic equipment, an optical link, and an electro-optical headset...	07/04/2006
7058309	Optoelectronic transceiver An optoelectronic transceiver including an optoelectronic transmitting unit disposed along an optical axis and having a radiation-emitting layer region and an active radiation-sensitive layer region. The optoelectronic transceiver further including an optoelectronic...	06/06/2006
6993260	Interconnecting processing units of a stored program controlled system using free space optics Internal communication signals in a stored program controlled system comprising a plurality of units configured to process signals are provided by a free space optical beam line which is proximal to all of the plurality of units. The free space beam line is configur...	01/31/2006
6700910	Wavelength tunable laser and optical device In order to form a wavelength tunable laser capable of tuning a wave over a wide range by simple control means, a thin film heater is mounted either over an upper electrode of a ridge waveguide semiconductor laser having ridge waveguides on a semiconducto...	03/02/2004
6697575	System and method for increasing capacity of long-haul optical transmission systems A method of increasing capacity on a long-haul undersea cable system having at least one optical fiber, said method comprising interleaving counter-propagating forward-propagating and backward-propagating signals in forward and backward channels on a comm...	02/24/2004
6671431	Optical transmission device and optical transmission system employing the same An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit and a first buffer light amplifying unit for amplifying a first signal light from a first t...	12/30/2003
6671084	Optical amplifier An optical amplifier includes an optical amplifying medium having a multiplexed light input thereto and providing an output of amplified multiplexed light, an excitation source which excites the optical amplifying medium; and at least one of a first monit...	12/30/2003
6301034	Pulsed laser microphone A microphone and method of use in which pulsed laser light is directed against a reflective diaphragm which is vibrated by sound waves thereby modulating the pulsed laser light reflected from the diaphragm. The modulated, pulsed laser light is transmitted...	10/09/2001
6266169	Optical transmission equipment which transmits an amplified optical data signal and an optical surveillance signal An optical transmission system accomplishes optical transmission over a long distance by combining a multiplexing line terminal with optical amplifiers, linear repeaters, and regenerators with optical amplifiers combined together. The system also accompli...	07/24/2001
6147787	Laser microphone A microphone for detecting sound pressure waves includes a laser resonator having a laser gain material aligned coaxially between a pair of first and second mirrors for producing a laser beam. A reference cell is disposed between the laser material and on...	11/14/2000
6014239	Optical microphone An optical microphone includes a laser and beam splitter cooperating therewith for splitting a laser beam into a reference beam and a signal beam. A reflecting sensor receives the signal beam and reflects it in a plurality of reflections through sound pre...	01/11/2000
5995259	Bidirectional optical telecommunication system comprising a bidirectional optical amplifier A bidirectional optical amplifier, comprising a unidirectional optical amplifying unit having one amplification wavelength band; two input/output ports for at least two optical signals having opposite propagation directions, said signals having a first an...	11/30/1999
5357362	Optical telephone using optical modulator An optical modulation method operable in an optical transmission path using an optical fiber, wherein an optical fiber bending region is formed by bending a portion of the optical fiber into a U shape having a predetermined bending width. A bending width ...	10/18/1994
5333205	Microphone assembly A microphone assembly (134) includes a movable diaphragm (124) and a linear light gradient (130) which causes the movement of diaphragm (124) to be translated into a corresponding amplitude of light to be received at a photo-detector (116). Thereby provid...	07/26/1994
5262884	Optical microphone with vibrating optical element An optical microphone includes a vibrating membrane defining a diaphragm for receiving acoustic signals. An optical element such as a lens is attached for vibrating with the membrane in direct relationship with the acoustic input signals. Fixed fiber opti...	11/16/1993
5146083	High temperature fiber optic microphone having a pressure-sensing reflective membrane under tensile stress A fiber optic microphone is provided for measuring fluctuating pressures. An optical fiber probe having at least one transmitting fiber for transmitting light to a pressure-sensing membrane and at least one receiving fiber for receiving light reflected fr...	09/08/1992
4882773	Audio microphone system with digital output and volume control feedback input A microphone/pickup system employing a digital signal throughout. There are a plurailty of digital microphone/pickup devices each comprising, a microphone/pickup element for sensing sound vibrations and for producing an analog electrical signal reflecting...	11/21/1989
4789213	Electro-optical modulator having a monomode light waveguide modulator An electro-optical modulator has a monomode light waveguide modulator for which a pressure-sensitive signal generator is provided as a signal source for the purpose of modulating a light power signal supplied to the monomode light waveguide modulator over...	12/06/1988
4766607	Method of improving the sensitivity of the earphone of an optical telephone and earphone so improved The sensitivity of the earphone of an optical telephone that contains a gas filled tube that reacts to small changes in temperature caused by amplitude variations in light to create sound is improved by replacing the gas tube opto-acoustic converter with ...	08/23/1988
4641377	Photoacoustic speaker and method A photoacoustic speaker and method for producing photoacoustic sound by utilizing a laser beam, modulating the intensity of the laser beam in response to audio signal inputs and passing the modulated laser beam into a gas absorption chamber wherein gas ca...	02/03/1987
4637071	Optical actuator An arrangement for the remote actuation of a controlled device, e.g. a hydraulic valve, in situations with stringent safety requirements, uses optical power. The optical power, e.g. from a high-power laser, is conveyed via an optical fibre (1) to the cont...	01/13/1987
4596051	Optical interface to an electrical central office An electro-optical interface unit is shown for interfacing an all-optical telephone to a conventional electrical-metallic-type telephone communications system, having conventional electrical subscriber units, switching, and supervisory systems. An overall...	06/17/1986
4590620	Optical telephone In an optical telephone wherein amplitude modulated light is converted to sound by applying the modulated light to an enclosed volume of gas wherein the volume and/or pressure of gas varies in synchronism with the instantaneous energy of the modulated lig...	05/20/1986
4479265	Laser microphone The invention is a laser microphone in which two aligned beams of laser light, of which one beam is slightly delayed in relation to the other beam of the same frequency and is reflected by an object in motion, to produce intensity variation that vary as a...	10/23/1984
4406003	Optical transmission system Short electromagnetic pulses, preferably optical pulses each of a different wavelength and/or polarization, are injected into a channel containing a medium with many energy levels in which the level populations are specified and in which the transitions b...	09/20/1983
4334321	Opto-acoustic transducer and telephone receiver An optical fiber element of low density, low heat capacity, a large coefficient of thermal expansion, and a large Young's modulus varies in light transmissivity gradually between its ends from high transmissivity to opacity, whereby power modulated light ...	06/08/1982
4284858	Dichroic transducer A dichroic transducer is disclosed including a light source, a film containing a dichroic material in the path of the light beam and an acoustic information-containing wave, and a detector in the path of the modulated light beam for detecting the intensit...	08/18/1981
4238856	Fiber-optic acoustic sensor An optical fiber acoustical sensor for detecting sound waves in a fluid mum. An optical fiber coil through which a light beam is transmitted is placed in a fluid medium. A sound wave propagating through the fluid medium and incident on the optical fiber ...	12/09/1980
4162397	Fiber optic acoustic sensor An optical fiber acoustical sensor for detecting sound waves in a fluid mum. An optical fiber coil through which a light beam is transmitted is placed in a fluid medium. A sound wave propagating through the fluid medium and incident on the optical fiber ...	07/24/1979

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Class 398/134 - Including optical fiber or waveguide