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| Number | Title | Issue Date |
| 7440168 | Managing gain tilt in an optically amplified transmission system An optical transmission system may include a combination of higher gain repeaters and lower gain repeaters, arranged to manage gain tilt. The higher gain repeaters and lower gain repeaters may be arranged to allow net gain to vary (e.g., above and below zero) within... | 10/21/2008 |
| 7355787 | Optical transmission system and optical filter assembly for submarine applications An optical amplifier assembly for submarine applications. The optical amplifier assembly comprises: a first and a second double stage fiber amplifier with respective first and second fiber amplifiers for amplifying optical signals (OS, OS′) each propagated on a re... | 04/08/2008 |
| 7349150 | Optical terminal apparatus An optical terminal apparatus includes a plurality of signal light units that transmits and receives a signal light having a predetermined wavelength; at least one pumping light unit that emits a pumping light having a predetermined wavelength to perform Raman ampli... | 03/25/2008 |
| 7346280 | Bi-directional long haul/ultra long haul optical communication link A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH ba... | 03/18/2008 |
| 7343096 | Method and apparatus for in-service upgrading of OADM to wavelength selective switch of higher degree System and methods for upgrading an optical add-drop multiplexer (OADM) to higher degree wavelength selective router (WSR)/wavelength selective switch (WSS) are disclosed. For example, an OADM of degree-2 may be provisioned for upgrades to degree-3 and higher. The e... | 03/11/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 7340165 | Optical amplifying device An optical amplifying device disposed on a transmission path of a WDM signal includes an optical amplifier amplifying the WDM signal, a detecting unit detecting a change in a transmission wavelength count contained in the WDM signal and/or a change in light receivin... | 03/04/2008 |
| 7336414 | Optical modulating device An optical modulation apparatus is provided which implements a stable amplifying function by reducing the effect of reflected light rays form end faces of a bidirectional optical amplifier by imposing a numerical limitation on the relationship between the gain of th... | 02/26/2008 |
| 7330651 | Optical amplifying apparatus, optical transmission system and method of adjusting optical transmission loss An optical amplifying apparatus connected mutually through an optical transmission line includes an optical detecting unit for detecting an input level of an amplified spontaneous emission (ASE) light, an optical amplifying unit for amplifying a signal light, and an... | 02/12/2008 |
| 7315206 | Travelling-wave amplifier A traveling-wave amplifier includes amplifiers coupled anti-parallel to transmission lines. Phase(s) of the amplifiers provide phase matching, which may additionally or alternately be provided by couplers or spatial offset of the amplifiers and couplers. The traveli... | 01/01/2008 |
| 7300216 | Optical connector adapter for interfacing a beam splitter/combiner to optical waveguides and method of forming the same An optical connector adapter includes a substrate having at least one optical waveguide for transporting optical signals. The substrate includes opposing ends, a top reference surface and side reference surface aligned relative to the at least one optical waveguide.... | 11/27/2007 |
| 7295365 | Optical gain flattening components, optical chips and optical amplifiers and methods employing same An optical component for gain-flattening multiplexed passband signals amplified with optical pump power, comprises a launch port optical waveguide operative to communicate multiplexed passband signals in a passband wavelength range and optical pump power in a differ... | 11/13/2007 |
| 7286756 | DWDM system with IP telephony provisioning at remote locations A method for providing voice communications at an optical amplifier site of a DWDM system is disclosed. The method generally comprises receiving an optical service channel at the amplifier site and converting an optical signal of the optical service channel to a dig... | 10/23/2007 |
| 7280719 | Wideband optical module and PON using the same A wideband optical module includes a downward wideband light source for generating downward light, an upward wideband light source for generating upward light, a first circulator including a first to a third port for outputting multiplexed downward optical signals t... | 10/09/2007 |
| 7269349 | Method of and device for performing bi-directional transmission using a single-wire Two signal lights having different wavelengths are bidirectionally transmitted on an optical-fiber transmission-line. A Raman pump light source generates a first Raman pump light having predetermined wavelengths with a Raman gain-bandwidth for amplifying the first s... | 09/11/2007 |
| 7266300 | BPSR optical transmission node A bi-directional path switched ring optical transmission node has simple configuration which reduces the influence of a wave reflected by an obstacle on optical line.The BPSR optical transmission node connects to a first optical line through which an odd channel sig... | 09/04/2007 |
| 7248804 | Optical transmission device using a wide input dynamic range optical amplifier Conventionally, an adjustment of an optical power level of an input Pin of an optical amplifier module is made with an optical variable attenuator. An optical coupler for measuring the optical power level of Pin and an optical variable attenuator are replaced by a v... | 07/24/2007 |
| 7234874 | Optical connector adapter for connecting optical pump sources to optical waveguides and method of forming same An optical connector adapter includes a substrate having optical waveguides for transporting optical signals. The optical connector adapter is for connecting optical pump sources to the optical waveguides using passive alignment. The substrate has opposing ends, a t... | 06/26/2007 |
| 7230959 | Tunable laser with magnetically coupled filter Laser apparatus and methods that permit actuation of a tuning element via a magnetically coupled drive assembly, and which provide for isolation of contamination-sensitive optical surfaces within a hermetically sealed enclosure with a magnetically coupled drive asse... | 06/12/2007 |
| 7231149 | Bidirectional optical add-drop multiplexer A bidirectional optical add-drop multiplexer adds and drops optical signals having specific wavelengths among the WDM optical signals transmitted bidirectionally through one of the optical transmission lines connected between neighbor nodes in a bidirectional WDM ri... | 06/12/2007 |
| 7228025 | Thin film interleaver A thin film interleaver device is disclosed. The thin film interleaver includes thin film optics. The thin film(s) are formed such that they reflect one group of wavelengths while allowing a second group of wavelengths to pass through the thin film(s). The thin film... | 06/05/2007 |
| 7215415 | Measurement method by OTDR and terminal station apparatus In a method for performing OTDR measurement in an optical transmission system including a first terminal station and a second terminal station, OTDR signal light is transmitted from an OTDR provided in the first terminal station to the second terminal station, in wh... | 05/08/2007 |
| 7212711 | Fiber optic transceiver module and electronic equipment A fiber optic module is provided that effectively reduces a returned light and is manufactured by a low time and cost consuming process and electronic equipment. The fiber optic transceiver module includes a block that includes an optical waveguide and a guide that ... | 05/01/2007 |
| 7212335 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 05/01/2007 |
| 7199921 | Two stage optical amplifier The invention describes a system of two-stage optical amplifiers adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifiers in a way suitable for forming bi-directional configurations useful in optical networks. ... | 04/03/2007 |
| 7199920 | Two stage optical amplifier The invention describes a two-stage optical amplifier adapted for inserting OADM in the mid-stage, and an integrated assembly designed for implementing the amplifier in a way suitable for forming unidirectional and bi-directional configurations useful in optical net... | 04/03/2007 |
| 7187861 | Method and apparatus for testing optical networks An instrument for measuring bidirectional optical signals propagating in an optical transmission path between elements one of which will not transmit if continuity of the transmission path is not maintained, for example a branch path between a central offices optica... | 03/06/2007 |
| 7171123 | Method for decreasing and compensating the transmission loss at a wavelength-division-multiplexed passive optical network and an apparatus therefor The present invention relates to a wavelength-division multiplexed passive optical network. In particular, it relates to a technology for minimizing the optical loss at a wavelength-division multiplexed passive optical network based on wavelength-locked light source... | 01/30/2007 |
| 7158698 | Module for amplifying signal light with remote excitation-light and optical-fiber communication system including the same A module for amplifying a signal light with a remote excitation-light, includes (a) a first optical input/output line through which a signal light is transmitted, (b) a second optical input/output line through which a signal light is transmitted, (c) an optical ampl... | 01/02/2007 |
| 7154664 | Apparatus and method for amplification medium performance simulation, and optical amplifier An amplification medium simulation apparatus comprises a basic data retaining unit 21, an input signal beam information retaining unit 22, and a simulation executing unit 31 approximating and calculating an output signal beam power at each signa... | 12/26/2006 |
| 7154659 | Optical depolarizers and DGD generators based on optical delay Techniques and devices for depolarizing light and producing a variable differential group delays in optical signals. In one implementation, an input optical beam is split into first and second beams with orthogonal polarizations. One or two optical reflectors are th... | 12/26/2006 |
| 7139119 | Fiber amplifier with suppression of amplified spontaneous emission A fiber amplifier module for amplifying a signal pulse includes an optically pumped double-pass fiber amplifier in which a fiber Bragg grating reflects an amplified pulse in between the first and second amplification passes, and transmits most forward-propagating am... | 11/21/2006 |
| 7136586 | Optical communication system The invention provides an optical communication system (10) comprising a plurality of mutually interconnected bi-directional optical waveguide rings (20, 30, 40, 50, 60) in which radiation modulated with communication traffic propagates. The radiation ... | 11/14/2006 |
| 7130121 | Erbium-doped fiber amplifier and integrated module components An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section... | 10/31/2006 |
| 7123405 | Optical amplifying and relaying system An optical amplifying and relaying system capable of easily and highly accurately monitor troubles in optical amplifiers provided in an up and a down optical fiber transmission line opposing each other is disclosed. Monitoring light signal folding-back lines includi... | 10/17/2006 |
| 7119947 | Dual-port broadband light source A dual-port broadband light source is disclosed. In the dual-port broadband light source, a first beam splitter splits a first ASE at a first ratio into the second and third light paths and outputs the first ASE received from the second light path to the first light... | 10/10/2006 |
| 7106501 | Fiber amplifier with suppression of amplified spontaneous emission A fiber amplifier module for amplifying a signal pulse includes an optically pumped double-pass fiber amplifier in which a fiber Bragg grating reflects an amplified pulse in between the first and second amplification passes, and transmits most forward-propagating am... | 09/12/2006 |
| 7088500 | Optical communication systems including optical amplifiers and amplification methods Optical systems of the present invention includes power sources that provide dedicated and shared power to a plurality of optical amplification sections. In various embodiments, multiple optical pump sources are provided the include a plurality of optical sources, w... | 08/08/2006 |
| 7075711 | Optical communication system having dynamic gain equalization An optical communication device, and related method, are provided for reducing ripple in WDM systems. In particular, the optical communication device includes a dynamic gain equalization (DGE) circuit is coupled to an optical communication path carrying the WDM opti... | 07/11/2006 |
| 7062169 | Systems and methods for compensating for signal transients A system compensates for the presence of power transients. The system receives a data signal and detects the occurrence of a power transient. The system generates a threshold signal based on the detected power transient and determines a value of the data signal base... | 06/13/2006 |
