| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | Optical surge suppressive type optical amplifier | US12197631 | 2008-08-25 | US07751119B2 | 2010-07-06 | Miki Onaka; Etsuko Hayashi |
| According to an optical surge suppressive type optical amplifier in the present invention, for a WDM optical amplifier having a multi-stages amplification configuration in which a plurality of optical amplifying means is connected in series, an optical amplifying medium capable of causing a homogeneous up-conversion (HUC) phenomenon is applied to the optical amplifying means on the signal light output side, so that an optical surge is suppressed utilizing the degradation of gain efficiency by the HUC caused at the time when the input power is decreased. Further, for a one wave optical amplifier, an optical amplifying medium capable of causing a pair induced quenching (PIQ) phenomenon is applied to the optical amplifying means on the signal light input side, so that the optical surge is suppressed utilizing the degradation of output power efficiency by the PIQ caused at the time when the input power is increased. As a result, it is possible to provide a low cost optical amplifier capable of effectively suppressing the optical surge without leading the complexity of control circuit or optical circuit configuration. | ||||||
| 162 | Optical transmission apparatus | US11319371 | 2005-12-29 | US07725032B2 | 2010-05-25 | Miki Onaka; Yasushi Sugaya; Hiroki Ooi |
| An optical transmission apparatus includes an optical add drop multiplexer (OADM) that adds/drops an optical signal to/from a transmission path. The optical transmission apparatus further includes a pump light multiplexer and a dispersion compensation fiber that are located downstream of the OADM on the transmission path. The optical transmission apparatus is configured to house a pump light source connectable to the pump light multiplexer to Raman amplify an optical signal in the dispersion compensation fiber. | ||||||
| 163 | Article comprising a series expandable erbium-doped fiber amplifier (SE-EDFA) | US11666825 | 2005-10-29 | US07692851B2 | 2010-04-06 | Paul Francis Wysocki; Mitchell Steven Wlodawski |
| A method for increasing the number of channels amplified by an optical amplifier arrangement is provided. The optical amplifier arrangement includes at least one optical amplifier stage amplifying a first number of channels at a given average gain level. The method begins by selecting a second number of channels to be amplified by the optical amplifier arrangement. At least one additional optical amplifier stage is serially coupled to an input or output of the at least one optical amplifier stage to form a multistage optical amplifier arrangement. The gain shape of the multistage optical amplifier is adjusted to maintain, at the given average gain level or greater, a prescribed degree of gain flatness over an operating bandwidth in which the second number of channels are located. | ||||||
| 164 | Bidirectional communication system | US11043087 | 2005-01-27 | US07512343B2 | 2009-03-31 | Balakrishnan Sridhar; Michael Y. Frankel; Vipul Bhatnagar |
| A bidirectional communication system is disclosed. A single optical line amplifier is used to amplify signals in both the east and west directions. Additionally, a single dispersion compensation module is used to compensate for fiber dispersion in both directions. Using a single optical line amplifier and a single dispersion compensation module for both directions allows for reduction in the number of optical line amplifiers used in a given network. | ||||||
| 165 | Optical Surge Suppressive Type Optical Amplifier | US12197631 | 2008-08-25 | US20080310011A1 | 2008-12-18 | Miki Onaka; Etsuko Hayashi |
| According to an optical surge suppressive type optical amplifier in the present invention, for a WDM optical amplifier having a multi-stages amplification configuration in which a plurality of optical amplifying means is connected in series, an optical amplifying medium capable of causing a homogeneous up-conversion (HUC) phenomenon is applied to the optical amplifying means on the signal light output side, so that an optical surge is suppressed utilizing the degradation of gain efficiency by the HUC caused at the time when the input power is decreased. Further, for a one wave optical amplifier, an optical amplifying medium capable of causing a pair induced quenching (PIQ) phenomenon is applied to the optical amplifying means on the signal light input side, so that the optical surge is suppressed utilizing the degradation of output power efficiency by the PIQ caused at the time when the input power is increased. As a result, it is possible to provide a low cost optical amplifier capable of effectively suppressing the optical surge without leading the complexity of control circuit or optical circuit configuration. | ||||||
| 166 | Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier | US11235600 | 2005-09-26 | US07466477B2 | 2008-12-16 | Susumu Kinoshita |
| The invention provides an optical fiber amplifier which assures stable operation of a pump light source and efficiently makes use of residual pump power to achieve improvement in conversion efficiency. The optical fiber amplifier includes a rare earth doped fiber. Pump light from a pump light source is introduced into one end of the rare earth doped fiber by way of a first optical coupler, and residual pump light originating from the pump light and arriving at the other end of the rare earth doped fiber is applied to the other rare earth doped fiber amplifier or the loss compensation of a dispersion compensating fiber by Raman amplification. | ||||||
| 167 | Waveform shaping apparatus, optical transmission system, and waveform shaping method | US12073035 | 2008-02-28 | US20080232817A1 | 2008-09-25 | Fumio Futami; Shigeki Watanabe |
| A waveform shaping apparatus includes a quantum dot optical amplifier in which an amplification factor of input signal beams saturates if the optical power of the signal beams is equal to or greater than a predetermined value; and a quantum dot saturable absorber in which an absorption factor of the input signal beams saturates if the optical power of the signal beams is under a predetermined value. The quantum dot optical amplifier and the quantum dot saturable absorber are connected in series with a transmission path of the signal beams, and shape the waveform of the signal beams. Voltages applied to the quantum dot optical amplifier and the quantum dot saturable absorber, respectively, are adjusted based on the optical power of the signal beams. | ||||||
| 168 | Article Comprising a Series Expandable Erbium-Doped Fiber Amplifier (Se-Edfa) | US11666825 | 2005-10-29 | US20080123181A1 | 2008-05-29 | Paul Francis Wysocki; Mitchell Steven Wlodawski |
| A method for increasing the number of channels amplified by an optical amplifier arrangement is provided. The optical amplifier arrangement includes at least one optical amplifier stage amplifying a first number of channels at a given average gain level. The method begins by selecting a second number of channels to be amplified by the optical amplifier arrangement. At least one additional optical amplifier stage is serially coupled to an input or output of the at least one optical amplifier stage to form a multistage optical amplifier arrangement. The gain shape of the multistage optical amplifier is adjusted to maintain, at the given average gain level or greater, a prescribed degree of gain flatness over an operating bandwidth in which the second number of channels are located. | ||||||
| 169 | Optical fiber communication system using remote pumping | US10552554 | 2004-07-05 | US07379236B2 | 2008-05-27 | Hiroji Masuda; Hiroto Kawakami; Yutaka Miyamoto |
| An optical fiber communication system is provided which uses remote pumping that is capable of improving pumping efficiency and reducing a noise figure. A coupler (20) of a linear repeater (18) couples signal light to pumping light outputted from a pumping light source (19). The outputted signal light and pumping light reach a linear repeater (25) through transmission fibers (22 to 24) and remote pumping modules (27F and 27R). A coupler (30) of the linear repeater (25) couples the signal light to the pumping light supplied from a pumping light source (29), to output the signal light and the pumping light to the transmission fiber (24). The remote pumping module (27F) divides the pumping light propagated in the transmission fiber (22), from the signal light. The remote pumping module 27F branches the divided pumping light in two directions with a predetermined ratio. After branching, each of the branched pumping light is coupled to the signal light to be supplied to both ends of an erbium-doped fiber. The remote pumping module (27R) is similar in structure to the remote pumping module (27F). | ||||||
| 170 | Article Comprising a Multichannel Optical Amplified Transmission System with Functional Upgrade Capabilities and Universal Modules | US11666826 | 2005-10-29 | US20080068701A1 | 2008-03-20 | Paul Wysocki; Mitchell Wlodawski |
| A universal inline functional module for operation with nonzero average gain G≠0 dB over a bandwith is provided. The module includes at least one optical functional element producing loss over the bandwidth and at least one rare-earth doped fiber segment. The module produces a flat gain spectrum to within a specified tolerance when made to operate at an average gain of 0 dB over the bandwidth. | ||||||
| 171 | OPTICAL AMPLIFIER, OPTICAL AMPLIFICATION REPEATER AND PUMP LIGHT SUPPLY CONTROL METHOD | US11831252 | 2007-07-31 | US20070268569A1 | 2007-11-22 | Shinichirou MURO; Yasushi Sugaya; Etsuko Hayashi |
| There is provided an optical amplifier including a Raman amplification medium, a rare earth doped fiber located at a latter stage of the Raman amplification medium, a first pump light outputting unit for outputting pump light with a plurality of wavelengths, a variable distribution element for distributing the pump light with the plurality of wavelengths, outputted from the first pump light outputting unit, to the Raman amplification medium and the rare earth doped fiber in a variable distribution ratio for each wavelength, and a control unit for individually controlling the distribution ratio of the pump light with the plurality of wavelengths in the variable distribution element and the power of the pump light with the plurality of wavelengths from the first pump light outputting unit in accordance with a wavelength arrangement of each of signal lights wavelength-multiplexed into the wavelength-multiplexed signal light. | ||||||
| 172 | Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier | US11728880 | 2007-03-27 | US20070171517A1 | 2007-07-26 | Susumu Kinoshita |
| The invention provides an optical fiber amplifier which assures stable operation of a pump light source and efficiently makes use of residual pump power to achieve improvement in conversion efficiency. The optical fiber amplifier includes a rare earth doped fiber. Pump light from a pump light source is introduced into one end of the rare earth doped fiber by way of a first optical coupler, and residual pump light originating from the pump light and arriving at the other end of the rare earth doped fiber is applied to the other rare earth doped fiber amplifier or the loss compensation of a dispersion compensating fiber by Raman amplification. | ||||||
| 173 | Controller which controls a variable optical attenuator to control the power level of a wavelength-multiplexed optical signal when the number of channels are varied | US10956107 | 2004-10-04 | US07227681B2 | 2007-06-05 | Yasushi Sugaya; Susumu Kinoshita |
| An optical amplifier which amplifies a wavelength division multiplexed (WDM) optical signal having a variable number of channels associated with different wavelengths and outputs the amplified WDM optical signal. The optical amplifier includes (a) an optical attenuator which controls a level of the amplified WDM optical signal, and (b) a controller which controls the WDM optical signal to be amplified with an approximately constant gain. | ||||||
| 174 | Optical amplifier | US11396551 | 2006-04-04 | US07215464B1 | 2007-05-08 | Kosuke Komaki; Hiroyuki Itoh |
| Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal light attenuation caused by a variable optical attenuator and the external attenuating medium connected in series, by means of a front optical detection section provided before the variable optical attenuator and the external attenuating medium and a back optical detection section provided thereafter. An attenuation amount control section controls the variable optical attenuator such that the amount of signal light attenuation detected by the attenuation amount detection section is kept constant. A connection detection section detects a connection or disconnection of the external attenuating medium in accordance with the amount of signal light attenuation obtained when the amount of attenuation caused by the variable optical attenuator is minimized. | ||||||
| 175 | Optical amplifier | US11322558 | 2006-01-03 | US20070047067A1 | 2007-03-01 | Miki Onaka; Yasushi Sugaya |
| In an optical amplifier of the invention, a first variable optical attenuator is provided between a fore-stage optical amplification unit and a post-stage optical amplification unit, and a second variable optical attenuator is also provided on the output side of the post-stage optical amplification unit. When a signal light input level of a WDM light inputted to an input port is lower than a base point level, an attenuation amount of the first variable optical attenuator is not increased (basically minimized), and the control which increases the attenuation amount of the second variable optical attenuator is performed corresponding to the increase in signal light input level. On the other hand, when the signal light input level is higher than the base point level, the attenuation amounts of both the first variable optical attenuator and the second variable optical attenuator are controlled according to the signal light input level. Accordingly, a low-cost WDM optical amplifier having a wide input dynamic range, in which a predetermined signal light output level and flatness of output wavelength characteristics can be kept by the simple control with respect to a fluctuation in signal light input level, can be provided. | ||||||
| 176 | Optical fiber communication system using remote pumping | US10552554 | 2004-07-05 | US20070003286A1 | 2007-01-04 | Hiroji Masuda; Hiroto Kawakami; Yutaka Miyamoto |
| An optical fiber communication system is provided which uses remote pumping that is capable of improving pumping efficiency and reducing a noise figure. A coupler (20) of a linear repeater (18) couples signal light to pumping light outputted from a pumping light source (19). The outputted signal light and pumping light reach a linear repeater (25) through transmission fibers (22 to 24) and remote pumping modules (27F and 27R). A coupler (30) of the linear repeater (25) couples the signal light to the pumping light supplied from a pumping light source (29), to output the signal light and the pumping light to the transmission fiber (24). The remote pumping module (27F) divides the pumping light propagated in the transmission fiber (22), from the signal light. The remote pumping module 27F branches the divided pumping light in two directions with a predetermined ratio. After branching, each of the branched pumping light is coupled to the signal light to be supplied to both ends of an erbium-doped fiber. The remote pumping module (27R) is similar in structure to the remote pumping module (27F). | ||||||
| 177 | Optical transmission systems including optical amplifiers, apparatuses and methods | US10893050 | 2004-07-16 | US07133193B2 | 2006-11-07 | Donald M. Cornwell, Jr.; John J. Veselka, Jr.; Stephen G. Grubb; Thomas D. Stephens; Ruxiang Jin; Alistair J. Price; Michael C. Antone |
| Optical systems of the present invention include amplifiers configured to achieve maximum signal channel in a span downstream of the transmitter and amplifier site and to decrease the interaction between the wavelengths at high signal channel powers. In addition, the system can include various types of optical fiber positioned in the network to provide for increased signal channel powers and higher gain efficiencies in the system. | ||||||
| 178 | Optical transmission apparatus | US11319371 | 2005-12-29 | US20060222367A1 | 2006-10-05 | Miki Onaka; Yasushi Sugaya; Hiroki Ooi |
| An optical transmission apparatus includes an optical add drop multiplexer (OADM) that adds/drops an optical signal to/from a transmission path. The optical transmission apparatus further includes a pump light multiplexer and a dispersion compensation fiber that are located downstream of the OADM on the transmission path. The optical transmission apparatus is configured to house a pump light source connectable to the pump light multiplexer to Raman amplify an optical signal in the dispersion compensation fiber. | ||||||
| 179 | Optical fiber cable | US11066537 | 2005-02-28 | US07099541B2 | 2006-08-29 | Takafumi Terahara; Rainer Hainberger; Takeshi Hoshida |
| An optical fiber cable including a plurality of optical fibers, each optical fiber having a characteristic value in a middle field which is larger than characteristic values in fields other than the middle field of the optical fiber. The characteristic value in a respective field is a nonlinear refractive index of the optical fiber in the field divided by an effective cross section of the optical fiber in the field. The middle field and the characteristic value in the middle field are set as a combination to suppress a nonlinear phase shift generated in light transmitted through the plurality of optical fibers. | ||||||
| 180 | Gain and signal level adjustments of cascaded optical amplifiers | US10414237 | 2003-04-16 | US07061666B2 | 2006-06-13 | Shinya Inagaki; Norifumi Shukunami; Susumu Kinoshita; Hiroyuki Itou; Taiki Kobayashi |
| An optical amplification device which includes first and second optical amplifiers, and a controller. The first optical amplifier receives a light and amplifies the received light. The second optical amplifier receives the light amplified by the first optical amplifier, and amplifies the received light. When a level of the light received by the first optical amplifier changes by Δ, the controller controls a level of the light received by the second optical amplifier to change by approximately −Δ. In various embodiments, the controller causes the sum of the gains of the first and second optical amplifiers to be constant. In other embodiments, the optical amplification device includes first and second optical amplifier and a gain adjustor. The gain adjustor detects a deviation in gain of the first optical amplifier from a target gain, and adjusts the gain of the second optical amplifier to compensate for the detected deviation. | ||||||
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