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| Number | Title | Issue Date |
| 6271962 | System of controlling wavelength division multiplexed optical amplifier and method thereof A wavelength division multiplexed optical amplifier controlling system and method. The wavelength division multiplexed optical amplifier controlling system includes an optical exchange system for generating and interpreting a supervision channel optical s... | 08/07/2001 |
| 6263003 | High-power cladding-pumped broadband fiber source and amplifier A very high power fiber light source can be realized by using a high concentration of doping and by pumping the cladding of the doped fiber. The light that enters the cladding will then enter the core and amplified spontaneous emission will result. With t... | 07/17/2001 |
| 6256140 | Optical amplifying apparatus for transmitting wavelength division multiplexed signal light and optical network apparatus with using the same An optical amplifying apparatus is basically arranged by employing an amplifying optical fiber, a pumping light source, and a wavelength division multiplexer for entering thereinto pumping light. This optical amplifying apparatus is further arranged by em... | 07/03/2001 |
| 6256138 | Fiber filter to improve return loss at signal band of a fiber amplifier for pump laser modules A fiber filter for use in an optical amplifier communication system is in the form of an optical fiber connected between a laser pump module and an amplifier. In one preferred embodiment, the optical fiber is configured to have a predetermined loop diamet... | 07/03/2001 |
| 6243196 | Optical fiber for optical amplifier and fiber optic amplifier An optical fiber for optical amplification used for 1.58 μm band signal light amplification, at least a core region thereof being doped with Er, wherein at least a part of the core region is made of silica glass co-doped with Ge and Al together with Er, ... | 06/05/2001 |
| 6240119 | Apparatus for providing a stabilized laser source Apparatus is provided for an improved stabilized laser source comprising a laser source having a light beam output and an electrical input. An optical waveguide, such as an optical fiber, having an input end is optically coupled to the laser source to rec... | 05/29/2001 |
| 6236793 | Optical channel waveguide amplifier An optical channel waveguide amplifier and fabrication process are provided for an optical communications system. The amplifier employs an optical waveguide having a core of active material exhibiting optical fluorescence when stimulated. The core has a p... | 05/22/2001 |
| 6229642 | Distributed fiber amplifier for solitons A distributed optical amplifier for use with soliton transmission, which reduces the effects of soliton--soliton interaction by introducing an optimum excursion in the soliton intensity. A optimum operating regime is found wherein both the pulse intensity... | 05/08/2001 |
| 6181466 | Unequal couplers for multimode pumping optical amplifiers A twin coupler system includes first and second optical couplers that couple a multimode pump fiber into a double-clad active primary fiber. The pump fiber carries multimode pump power from a multimode source. The primary fiber, on the other hand, carries... | 01/30/2001 |
| 6178276 | End-pumped waveguide optical splitter-amplifiers based on self-imaging The invention discloses devices and methods of manufacturing devices for the splitting and amplification of light signals by use of an end-pumped waveguide optical device, based on either (a) self-imaging multiplexing of the signal and pump light, then am... | 01/23/2001 |
| 6178037 | Optical amplifying apparatus A computer-controlled optical amplifying apparatus, which includes an optical amplifying unit including an optical amplifying medium and an optical amplifying control unit controlling the optical amplifying unit under the control of a computer. This optic... | 01/23/2001 |
| 6163396 | Optical wavelength converter A wavelength converter comprises a loop of optical fiber having an entry end (14) and an exit end (16). The entry end of the loop forms an input for a pump wavelength and the exit end forms an outlet for a converted signal. The loop is arranged to produce... | 12/19/2000 |
| 6141468 | Method of apparatus for remotely pumping a rare-earth doped optical fiber amplifier and a communication system employing same A method and apparatus is provided for providing pump energy to a doped optical fiber located along an optical transmission path. The doped optical fiber imparts amplification to an optical signal when pumped at a pump wavelength. In accordance with the m... | 10/31/2000 |
| 6122413 | Fiber optic transmitter A fiber optic transmitter provides integrated creation and amplification of a fiber optic signal from a single pump source. A fiber laser is utilized to produce a signal output and a remnant pump output from a single pump source. The remnant pump output i... | 09/19/2000 |
| 6091540 | Optical amplifier An optical amplifier which amplifies a signal light, wherein a pumping light source outputting a pumping light, a first wavelength multiplexer multiplexing the signal light and the pumping light and providing a multiplexed light to a first doped fiber. A ... | 07/18/2000 |
| 6078422 | Optical amplifier unit control methods optical amplifier systems and systems which use the methods and amplifier systems An optical amplifier controlling method and optical amplifier system which are simple in composition, maintain the S/N ratio of an optical signal output, have high control responsiveness, suppress the generation of a light surge, and amplify the optical s... | 06/20/2000 |
| 6055093 | Optical amplifying apparatus and linear relay optical amplifier transmitter A wavelength multiplexing optical transmitting apparatus includes a plurality of optical transmitters for transmitting optical signals having mutually different wavelengths, a wavelength multiplexing circuit for wavelength multiplexing optical signals, an... | 04/25/2000 |
| 6031849 | High power three level fiber laser and method of making same A rare earth doped fiber for use in a fiber laser is presented. The fiber laser uses a single stripe broad area pump diode permits Yb lasing in its 3-level transition at 980 nm preferentially over the 1010 nm 4-level transition. The present fiber laser is... | 02/29/2000 |
| 6025954 | Amplified telecommunication system for wavelength-division multiplexing transmissions, having an equalized reception power An optical telecommunication system including a transmitting station and a receiving station for optical signals, connected with each other by an optical fiber line including optical line amplifiers having a rare-earth-doped active fiber and connected in ... | 02/15/2000 |
| 6011645 | EDFA for amplifying transmitted light by dividing an exciting pump power in two directions An erbium doped fiber amplifier having one pumping source which outputs pump power so as to excite a light signal, the amplifier including: a first erbium doped fiber for receiving an excitation light signal input from the pumping source, and amplifying a... | 01/04/2000 |
| 5995275 | Doped fiber amplifier using bidirectional pumping with pump lights having different frequencies A doped fiber amplifier which provides bidirectional pumping to amplify a signal light, and reduces instability of gain caused by the bidirectional pumping. The doped fiber amplifier includes a rare earth element doped optical fiber, a first light source ... | 11/30/1999 |
| 5991068 | Gain controlled optical fibre amplifier In a gain-controlled erbium-doped optical amplifier, gain control is achieved by clamping the gain of a laser cavity to be equal to the overall cavity loss and by fixing the resonant wavelength of the amplifier to be at a first wavelength. When an optical... | 11/23/1999 |
| 5991069 | Split-pumped dual stage optical fiber amplifier A dual-stage doped fiber amplifier is provided which utilizes a single pump laser and a passive power splitter to pump both amplifier stages. The passive splitter couples a first portion of the power output of the single pump laser to a first stage amplif... | 11/23/1999 |
| 5978131 | In-fiber two-stage amplifier providing WDM signal conditioning The amplifier is a two-stage amplifier in which dispersion compensation and WDM channel equalization are carried out using a plurality of in-waveguide Bragg gratings placed between the two stages. The first stage has a gain able to raise the intensity of ... | 11/02/1999 |
| 5966236 | Optical signal channel counter and optical amplification device using the same Disclosed is an optical amplification device comprising a pulser for pulsing a multi-channel signal which has been wavelength division multiplexed; a pulse signal disperser for dispersing the pulsed signal at each wavelength and outputting a dispersed pul... | 10/12/1999 |
| 5959767 | Loss-less optical cross-connect A loss-less optical cross-connect advantageously employs a plurality of optical rare earth-doped fiber optical amplifiers as gain-switched optical connections, for example, gain-switched optical distributors and gain-switched optical selectors. Each of th... | 09/28/1999 |
| 5946428 | Fiber optic system with simultaneous switching and raman A fiber optic system in accordance with the present invention includes an optical fiber, a coupling device, and a system for generating a pump signal. The optical fiber has a birefringence which preserves polarization and has a first polarization mode whi... | 08/31/1999 |
| 5937126 | Optically amplifying/repeating transmission system and optical amplifier An optical transmission system for optical transmission with the capacity of 100 Gb/S over a distance of 9,000 km or more includes an light sending station for outputting an optical signal in the band of 1.55 μm, and an light receiving station connected ... | 08/10/1999 |
| 5933270 | Optical equalizer An optical equalizer for a wavelength-multiplexed optical communication system where an optical signal composed of a plurality of signal lights with different wavelengths is transmitted through an optical transmission line. The optical equalizer having: a... | 08/03/1999 |
| 5930030 | Apparatus for pumping an optical gain medium with multiple light wavelengths An apparatus for pumping an optical gain medium, such as a fiber gain medium, comprises a pump source having a plurality of different spatially separate or multiple wavelengths or wavelength bands which are all coupled into the fiber gain medium and provi... | 07/27/1999 |
| 5923462 | Dynamic gain control system for optical amplifier and method thereof The dynamic gain control system includes a pump source providing pump light. The dynamic gain control system measures a certain portion of the input pump light into the optical amplifier and measures a certain portion of the output pump light from the opt... | 07/13/1999 |
| 5917648 | Packaged optical amplifier assembly A packaged optical amplifier assembly includes an erbium doped silica based optical amplifying fiber (330) co-pumped and counter-pumped by a pair of laser diodes (336) as optical pumps. The optical pumps (336) are each coupled to an end (332, 340) of the ... | 06/29/1999 |
| 5880875 | Light amplifier having a multi-stage optical isolator A light amplifier is constructed with only one multi-stage optical isolator so as to reduce the size thereof and to lower the fabrication cost thereof. The multi-stage optical isolator has two input ports and two output ports for cutting-off a reverse flo... | 03/09/1999 |
| 5847863 | Hybrid short-pulse amplifiers with phase-mismatch compensated pulse stretchers and compressors Disclosed is a system for amplification of ultrashort optical pulses. The disclosed system has reduced size and increased robustness, reliability and cost-effectiveness. The disclosed invention is particularly effective in chirped pulse amplification (CPA... | 12/08/1998 |
| 5822113 | Optical amplifier using optical circulator and fiber amplifier An optical amplifier achieves multistage amplification with a four port optical circulator with fiber amplifiers and Faraday rotators and mirrors connected to at least two of the ports. The fiber amplifiers permit the signal to pass through the fiber ampl... | 10/13/1998 |
| 5805627 | Laser diode and optical communications system using such laser diode Embedded layers having a high resistance or an inverse conductivity with respect to a ridge structure are formed on either side of a ridge structure which is formed to correspond to an light emission region of a laser diode. The embedded layers confines a... | 09/08/1998 |
| 5790722 | High power optical fiber amplifier/laser system A high power Er-doped fiber amplifier/laser system includes a cladding-pumped fiber grating laser that emits an output beam at a wavelength that falls within an absorption band of erbium. The fiber grating laser output beam is used as the pumping source f... | 08/04/1998 |
| 5726796 | Optical amplifier In the optical amplifier designed as a bidirectionally operating IOC module for use in optical broadband systems, two spatially separated, erbium-doped active waveguides (16, 30) are integrated on a silicon substrate (1), and have different amplification ... | 03/10/1998 |
| 5638204 | Optical power amplifier with Al2 O3 and erbium doped active fiber An optical fiber power amplifier, particularly for telecommunication lines with optical fibers, including an active fiber doped with Erbium as a fluorescing substance, and with Al2 O3 as refraction index modifying dopant. The fiber i... | 06/10/1997 |
| 5600482 | Optical amplifier circuit capable of carrying out stable amplification In an optical amplifier circuit for amplifying input signal light by the use of excitation light having polarized light component into amplified output light, an optical fiber doped with a rare-earth element amplifies the input signal light into the ampli... | 02/04/1997 |
