| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | Cross-gain modulation type optical wavelength converter having high extinction ratio and wide input dynamic range | US10360453 | 2003-02-06 | US20040090662A1 | 2004-05-13 | Joon Hak Bang; Je Soo Ko |
| The present invention provides a cross-gain modulation type optical wavelength converter having a high extinction ratio and a wide input dynamic range, which is capable of preventing an extinction ratio from lowering and allowing an input dynamic range to widen. The XGM type optical wavelength converter of the present invention allows a probe light to be cross-gain modulated by a pump light one more time using two SOAs, and allows the width of the modulation of the probe light to be further broadened, thereby improving the extinction ratio after wavelength conversion. Simultaneously, the XGM type optical wavelength converter detects the intensity of an optical signal inputted to the optical wavelength converter and automatically controls the intensity of the probe light on the basis of the detected intensity of the input optical signal, thereby providing a wide input dynamic range. | ||||||
| 62 | Optical wavelength converter | US09796808 | 2001-03-02 | US06710911B2 | 2004-03-23 | Michael LoCascio; Clinton T. Ballinger; Daniel P. Landry |
| An optical wavelength converter converts an optical input signal having a first wavelength into an optical output signal having a second wavelength. The wavelength converter includes a saturable absorber switch having a control beam waveguide and an input waveguide. The converter further includes a first input coupled to the control beam waveguide and adapted to receive the optical input signal, and a second input coupled to the input waveguide and adapted to receive a second optical signal having the second wavelength from an optical source. | ||||||
| 63 | Wavelength converter and wavelength division multiplexing transmission method using same | US09750535 | 2000-12-28 | US06665113B2 | 2003-12-16 | Osamu Aso; Shu Namiki; Kouki Sato; Hijiri Nimura |
| Solely lightwaves required to be wavelength converted are filtered out from the input broadband WDM lightwaves and are wavelength converted by use of FWM. Not only the broadband simultaneous wavelength conversion that is studied by many researchers, but also more flexible, sub-band wavelength conversion is realized. Frequency interval of the input WDM lightwaves is broadened or reduced in comparison of the frequency interval of the WDM lightwaves inputted to the wavelength converter. The frequency interval variation techniques using the wavelength converter, it can be realized to transfer from a transmission line less influenced by inter-channel crosstalk due to FWM to the different transmission lines strongly influenced by inter-channel crosstalk due to FWM, and vice versa. | ||||||
| 64 | Optical function element and device | US10381890 | 2003-03-31 | US20030174393A1 | 2003-09-18 | Yoshinobu Maeda; Takahiro Ichikawa |
| An optical function device capable of controlling an optical signal with another optical signal, wherein a modulated input light Iin of a wavelength null1 is coupled with a bias light Ibias of a wavelength null2, and the thus coupled input and bias lights are input to a first semiconductor optical amplifying element 48, so that the bias light Ibias is intensity-modulated in a phase reversed with respect to the input light Iin, while the input light Iin is cut by a first wavelength extracting element 56. A control light Ic of the wavelength null1 is coupled with the intensity-modulated bias light Ibias of the wavelength null2, and the thus coupled control and bias lights are input to a second optical amplifying element 50, so that the once reversed bias light Ibias of the wavelength null2 is intensity-modulated with respect to the control light Ic of the wavelength null1, and is extracted as an output light by a second wave extracting element 50. The optical function device functions as a three-terminal optical computing and amplifying device, a three-terminal optical switching device or an optical DEMUX device, which is capable of controlling an optical intensity by using one wavelength and which permits multi-stage connection. | ||||||
| 65 | Optical wavelength converter | US09669745 | 2000-09-26 | US06603592B1 | 2003-08-05 | Charles H. Joyner; Jacco Leonard Pleumeekers |
| An optical-to-optical wavelength converter for converting a plurality of optical bits from a first wavelength in a first wavelength band to a second wavelength in a second wavelength band. The optical-to-optical wavelength converter employs a directional coupler. The directional coupler includes at least one optical element having an index of refraction, which changes in response to optical power substantially in the first wavelength band. | ||||||
| 66 | Non-linear photonic switch | US10293752 | 2002-11-13 | US20030133677A1 | 2003-07-17 | Christopher McCoy; John Tsen-Tao Chen |
| A photonic switch may be formed using one of a selected group of non-linear optical materials. Each of the materials within this group has a refractive index that demonstrates a substantial peak as a function of wavelength. The photonic switch includes a positive gain, and thus acts as a photonic transistor. In addition, a photonic switch is formed so that a gate signal is applied in a direction that is substantially perpendicular to the direction of the input signal so that there is no effective contamination of the input signal by the gate signal affecting the output signal. | ||||||
| 67 | Photon modulation, distribution, and amplification system | US09923111 | 2001-08-06 | US06587252B1 | 2003-07-01 | Donald G. Bottrell; Todd M. Capser |
| An optical communication device includes a first photon source emitting a first beam modulated with information. The first beam intersects a thin metal film and engenders a first surface plasmon wave thereon. Part of the first beam reflects from the metal film to form a reflected beam. A polarization structure rotates the polarization of the reflected beam. A reflecting structure reflects the reflected beam to form a second beam propagating back toward the film, which beam passes through the polarization structure again. On the metal film, the second beam engenders a second surface plasmon wave. Interaction between the first and second surface plasmon waves creates a surface plasmon standing wave. A second source provides a third beam intersecting the first and second beams at the metal film. Interaction between the third beam and the surface plasmon standing wave modulates the third beam as it passes through the metal film. | ||||||
| 68 | Optical wavelength conversion device | US10291688 | 2002-11-12 | US20030107790A1 | 2003-06-12 | Shoichi Kishimoto |
| An optical wavelength conversion device comprising: a modulating signal generating unit for generating a modulating signal; an optical modulating unit for modulating input light by the modulating signal; and wavelength select means for extracting only a necessary component from an optical signal generated by the optical modulating unit. In the optical wavelength conversion device, the optical modulating unit may be an amplitude modulator or a phase modulator. The modulating signal may be an electrical signal or an optical signal. When the modulating signal is an optical signal, the optical signal consists preferably of light of a plurality of wavelength components. | ||||||
| 69 | Multi-frequency light source | US10112096 | 2002-03-27 | US20030048503A1 | 2003-03-13 | Osamu Aso; Shunichi Matushita; Misao Sakano; Masateru Tadakuma |
| A multi-frequency light producing method and apparatus multiplies the number of optical channels present in an incident wavelength division multiplexed (WDM) signal light source by four-wave mixing (FWM) the WDM signal with at least one pump lightwave at least one time. By FWM the WDM light and a pump lightwave multiple times, wherein each FWM process is executed with a pump lightwave having a different frequency, either in series or parallel, the number of optical channels produced as a result of FWM effectively increases the number of optical channels present in addition to those from the WDM signal. The light producing method and apparatus can be employed in a telecommunications system as a an inexpensive light source producing a plurality of optical frequencies. | ||||||
| 70 | Wavelength converter with modulated absorber | US09828004 | 2001-04-06 | US20020186453A1 | 2002-12-12 | Sung-Joo Ben Yoo |
| An optical wavelength converter, particularly useful in a wavelength-division multiplexing communication system, including a semiconductor junction in one arm of a Mach-Zehnder interferometer through which a data signal at a first wavelength and a probe signal at a second wavelength counter propagate. The junction is reversed biased into avalanche to selectively absorb the data signal and thereby phase modulate the probe signal according to the data impressed on the data signal. The phase modulated probe signal is beat against an unmodulated probe signal, thereby converting the wavelength of the optical carrier. A tunable laser may produce a probe signal of selectable wavelength. The data signal may first be converted by cross-gain modulation to a third wavelength out of band from the other signals before it is interacts with the probe signal. | ||||||
| 71 | Recursive photonic wavelength shifter | US09810911 | 2001-03-16 | US20020131155A1 | 2002-09-19 | Michael H. Myers |
| An apparatus and method for recursive wavelength shifting is described. A photonic signal, comprised of one or more channels, is received, recursively wavelength shifted and filtered to provide a photonic spectrum. The spacing between repeating portions of the photonic spectrum is controlled with a shift signal. One or more output filters select a portion of the photonic spectrum and provide an photonic output signal corresponding thereto. Wavelength shifting is performed with a variety of modulation devices or techniques. Recursive wavelength shifting increases the wavelength shifting attainable with limited bandwidth modulation signals. | ||||||
| 72 | Optical wavelength converter | US09796808 | 2001-03-02 | US20020122241A1 | 2002-09-05 | Michael LoCascio; Clinton T. Ballinger; Daniel P. Landry |
| An optical wavelength converter converts an optical input signal having a first wavelength into an optical output signal having a second wavelength. The wavelength converter includes a saturable absorber switch having a control beam waveguide and an input waveguide. The converter further includes a first input coupled to the control beam waveguide and adapted to receive the optical input signal, and a second input coupled to the input waveguide and adapted to receive a second optical signal having the second wavelength from an optical source. | ||||||
| 73 | Method and apparatus for wavelength conversion and switching | US09575040 | 2000-05-19 | US06433919B1 | 2002-08-13 | Aref Chowdhury; Leon McCaughan |
| A two-dimensional second order nonlinear lattice formed in a lattice body is utilized for performing a one-step optical carrier wavelength interchange between pairs of input optical signals. The lattice body includes sensitized regions arranged in a two-dimensional array in a matrix material with the sensitized regions differing from the matrix material in the sign of the second order susceptibility. When an optical pump signal is coupled to the lattice body at a frequency corresponding to the sum of the frequencies of the two input signals, nonlinear interactions in the lattice body produce wavelength interchange between the input signals, resulting in angularly deflected optical signals exiting the lattice body in which the signal information on the input signals is interchanged between the carrier frequencies of the two input signals. The apparatus can be utilized to provide switching of optical signals and wavelength interchange for applications such as in wavelength division multiplexed communication systems. | ||||||
| 74 | Ultra-high speed optical wavelength converter apparatus for enabling simultaneous extraction of all optical clock signals | US09778094 | 2001-02-07 | US20020063944A1 | 2002-05-30 | Dong Hwan Kim; Sang Bae Lee; Sang Sam Choi; Young Tae Byun; Han Il Ki |
| The present invention provides an ultra-high speed optical wavelength converter apparatus for enabling extraction of all optical lock signals which implements an ultra-high speed wavelength converter without an external pump light by constructing a semiconductor-fiber ring laser (SFRL) in which a semiconductor optical amplifier (SOA) is used as a laser gain medium and simultaneously implements a clock pulse generator for generating an optical pulse string which is injection mode-locked by an input signal light, and then is phase-locked with an input signal string. According to the present invention, there is proposed an ultra-high speed optical wavelength converter apparatus for enabling extraction of all optical lock signals in which when an output is obtained at a suitable position within a laser resonator after constituting a semiconductor optical laser, a phase lock signal is generated by an injection mode locking laser and a wavelength converter apparatus eliminating the necessity of an external pump light is implemented at another position thereof. | ||||||
| 75 | Optical signal processor | US09717466 | 2000-11-20 | US06377388B1 | 2002-04-23 | Haruhisa Sakata; Kosuke Nishimura; Masashi Usami; Munefumi Tsurusawa |
| An optical signal processor is disclosed comprising a first optical path having a first electroabsorption optical modulator to be applied with a constant voltage and to absorb light of a signal wavelength, a second optical path having a fixed phase relation with the first optical path relative to a probe wavelength, a probe light introducer for dividing probe light of the probe wavelength into two portions and feeding them respectively into the first and second optical paths, an original signal light introducer for introducing original signal light of the signal wavelength into the first electroabsorption optical modulator, and a combiner for combining both light of the probe wavelength passed through the first and second paths. | ||||||
| 76 | Optical device | US09586756 | 2000-06-05 | US06374029B1 | 2002-04-16 | Yoshiaki Nakano; Byong-Jin Ma |
| An optical device having a large extinction ratio and being suitable for the digital operation including first and second electrodes (7, 8) formed on both sides of a waveguide structure, respectively such that a carrier-injection region (3a) and a non-carrier injection regions (3b) are formed adjacent to each other in the waveguide structure. When mass carriers are stored in the carrier injection region, its refractive index is reduced lower than the non-carrier-injection regions. In this state, when a light wave with low optical power propagates through the carrier-injection region, since an amount of carriers consumed thereby is small, the refractive index of this region is still lower than the non-carrier-injection regions, and the input light wave is emitted sideways through the non-carrier-injection region. In contrast, when a light wave with high optical power propagates through the carrier-injection region, since the carrier consumption is large, the refractive index of this region (3a) becomes higher than the non-carrier-injection regions (3b), and the input light propagates through a waveguide which is optically induced to extend from the incident surface to the exit surface. | ||||||
| 77 | Optical wavelength converter with active waveguide | US09276925 | 1999-03-26 | US06356382B1 | 2002-03-12 | Yoshiaki Nakano; Byong-Jin Ma |
| An optical wavelength converter, including first and second semiconductor optical amplifiers, in which an input optical pulse signal having a first wavelength &lgr;1 and a non-modulated optical signal having a second wavelength &lgr;2 are made incident upon the first semiconductor optical amplifier. Propagation constants of the first and second semiconductor optical amplifiers are determined such that a propagation constant difference &Dgr;&bgr; between the first and the second semiconductor optical amplifiers when only the optical signal having the second wavelength &lgr;2 propagates along the first semiconductor optical amplifier is smaller than a propagation constant difference &Dgr;&bgr; when both the input optical pulse signal and non-modulated optical signal propagate along the first semiconductor optical amplifier. During a lower power level of the input optical pulse signal, an amplified optical output signal having the second wavelength &lgr;2 emanates from the second semiconductor optical amplifier due to the optical coupling, but during a higher power level of the input optical pulse signal, the optical coupling between the first and second waveguides is substantially released and no optical signal is emitted from the second semiconductor optical amplifier. | ||||||
| 78 | Wavelength converter and wavelength conversion method | US09342445 | 1999-06-29 | US06323992B1 | 2001-11-27 | Yoshiyasu Ueno |
| To a first nonlinear waveguide and a second nonlinear waveguide each having a refractive index which varies in response to the input of an optical signal, input optical signal pulses are inputted together with continuous light of a predetermined wave length said input optical signal pulses being caused to have a time delay corresponding to 0.6˜1.2 times the pulse width of said input optical signal pulses. Then, the phase of an optical signal outputted from the second nonlinear waveguide is adjusted to a predetermined amount with respect to the phase of an optical signal outputted from the first nonlinear waveguide, and the optical signal outputted from the first nonlinear waveguide and an output signal outputted from the second nonlinear waveguide are coupled, whereafter a wavelength component of the input optical signal pulse is removed from the coupled optical signal. Consequently, an output optical signal pulse of a wavelength different from that of the input optical signal pulse can be obtained while little wavelength chirping is generated. | ||||||
| 79 | Wavelength converter | US09781351 | 2001-02-12 | US20010019447A1 | 2001-09-06 | Yoshiyasu Ueno; Kazuhito Tajima |
| A wavelength converter which has a simple configuration and can be easily controlled and stably operated, used for a long-distance mass optical communication, it comprises a waveguide 5 for causing a change of a nonlinear refractive index, a delay interference circuit 6 having two optical paths 62 and 63 of different optical path lengths, and a CW light source 1 and the like, wherein a coherent length (nullLCnullvg/nullnull:vg is a traveling speed of the CW light in the delay interaction circuit 6) determined by a spectral line width (nullnull) of CW light output from the CW light source 1 is longer than an optical path difference (nullLd) between the two optical paths in the delay interference circuit 6 (nullLC>nullLd). | ||||||
| 80 | Wavelength converter and wavelength division multiplexing transmission method using same | US09750535 | 2000-12-28 | US20010007509A1 | 2001-07-12 | Osamu Aso; Shu Namiki; Kouki Sato; Hijiri Nimura |
| Solely lightwaves required to be wavelength converted are filtered out from the input broadband WDM lightwaves and are wavelength converted by use of FWM. Not only the broadband simultaneous wavelength conversion that is studied by many researchers, but also more flexible, sub-band wavelength conversion is realized. Frequency interval of the input WDM lightwaves is broadened or reduced in comparison of the frequency interval of the WDM lightwaves inputted to the wavelength converter. The frequency interval variation techniques using the wavelength converter, it can be realized to transfer from a transmission lines less influenced by inter-channel crosstalk due to FWM to the different transmission lines strongly influenced by inter-channel crosstalk due to FWM, and vice versa. | ||||||
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