WO2002073294A1 - Variable light wave function circuit and variable light wave function device - Google Patents
Variable light wave function circuit and variable light wave function device Download PDFInfo
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- WO2002073294A1 WO2002073294A1 PCT/JP2002/002031 JP0202031W WO02073294A1 WO 2002073294 A1 WO2002073294 A1 WO 2002073294A1 JP 0202031 W JP0202031 W JP 0202031W WO 02073294 A1 WO02073294 A1 WO 02073294A1
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- polarization
- optical fiber
- light
- wavelength
- maintaining optical
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2726—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide
- G02B6/274—Optical coupling means with polarisation selective and adjusting means in or on light guides, e.g. polarisation means assembled in a light guide based on light guide birefringence, e.g. due to coupling between light guides
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2706—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters
- G02B6/2713—Optical coupling means with polarisation selective and adjusting means as bulk elements, i.e. free space arrangements external to a light guide, e.g. polarising beam splitters cascade of polarisation selective or adjusting operations
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
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- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29302—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means based on birefringence or polarisation, e.g. wavelength dependent birefringence, polarisation interferometers
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- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/29395—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device configurable, e.g. tunable or reconfigurable
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- G02F2203/15—Function characteristic involving resonance effects, e.g. resonantly enhanced interaction
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Definitions
- variable light wave function circuit and variable light wave function device
- the present invention relates to a variable lightwave functional circuit and a variable lightwave functional device, and more particularly to a variable lightwave functional circuit and a variable lightwave functional device using mode coupling in a polarization maintaining optical fiber.
- optical fiber communication systems and networks have been rapidly developing since the emergence and commercialization of optical fiber amplifiers in the early 1990s. At present, it is possible to realize ultra-long distance (eg, ⁇ 10, OO km) 'ultra-high speed (eg, ⁇ 4 OG bZs)' wavelength multiplexing (WDM, eg, ⁇ 64 wavelength) transmission systems. There. And fiber optic information and communication networks are considered to be the most important social infrastructure in the early 21st century. However, at present, optical fiber communication systems are mainly used only for one-to-one backbone systems, and the network is mainly composed of conventional coaxial cables and semiconductor integrated circuits and electronic devices.
- a transversal filter using the side pressure-induced polarization mode coupling of a polarization maintaining optical fiber (PMF) is realized”.
- PMF polarization maintaining optical fiber
- a transversal filter includes a repetitive structure having a delay line and a branch weighting circuit as a basic unit, and a sum circuit. Unlike the case of electricity, it is difficult to realize a sum circuit with light, so a two-port cascade connection type optical lattice type is used [1] (where [] indicates a reference number described below. ). Also, repeatedly Matsuhatsu :!
- Optical lattice filters based on planar optical integrated circuits (PLCs) using optical circuit structures have been proposed by Jinguji Temple and others at NTT [2], and have realized the various functions described above.
- Koseki et al. Of Sophia University have shown that an optical license filter can be made even with a PMF rotation connection structure that uses the PMF polarization mode delay as the delay and uses the PMF rotation connection as the branch weight. [13 [3 ⁇ .
- the present invention provides an optical fiber type variable lightwave function circuit and a variable lightwave function device which can cope with a change in the configuration of a WDM optical network and have various functions.
- the purpose is to provide.
- the present invention realizes many functions such as optical filtering, wavelength add / drop, pulse multiplexing, optical amplifier gain equalization, optical fiber chromatic dispersion compensation, and the like. It is an object of the present invention to provide a variable lightwave functional circuit and a variable lightwave functional device that can be applied to an optical communication device such as the above.
- the present invention utilizes the side pressure-induced polarization mode coupling of the PMF instead of the PMF rotary connection, and changes the position and magnitude of the side pressure, thereby making the characteristics variable and changing the characteristics of a high-performance optical transversal filter or the like.
- the purpose is to realize a lightwave function circuit and a variable lightwave function device.
- a polarization maintaining optical fiber having a polarization axis, and inducing a polarization mode coupling by applying a side pressure to a predetermined position by the applying unit;
- a first polarizer provided at one end of the polarization maintaining optical fiber, wherein a polarization axis is arranged at a predetermined angle with respect to a polarization axis of the polarization maintaining optical fiber;
- a second polarizer provided at the other end of the polarization maintaining fiber, and disposed so that a polarization axis coincides with a polarization axis of the polarization maintaining optical fiber;
- variable light wave functional circuit is changed by the induced polarization mode coupling according to any one or a plurality of conditions, and the laser light whose characteristics are changed is converted into the laser light of the second or first polarizer.
- a variable lightwave function circuit that emits light through any one of them, which is not the incident side.
- a polarization maintaining optical fiber having a polarization axis, and inducing a polarization mode coupling by applying a side pressure to a predetermined position by the applying unit;
- the other end of the polarization maintaining optical fiber is disposed such that the polarization axes thereof coincide with each other, and the other end of the polarization maintaining optical fiber is arranged so that the polarization axes thereof coincide with each other.
- the polarization maintaining optical fiber has a position, a number, and a size of the lateral pressure applied by the application section.
- the characteristics of the variable light wave functional circuit are changed by the induced polarization mode coupling, and the laser light whose characteristics are changed is emitted from the fourth port of the branch coupler.
- the present invention provides a variable lightwave functional circuit adapted to perform the above.
- An optical amplifier that outputs wavelength-multiplexed light including a plurality of pulses at a first wavelength interval; and first to third ports, wherein the output of the optical amplifier input from the first port is output to the first port.
- a polarization splitter / branch coupler that branches to the second and third ports;
- An optical power bra arranged at a second port of the polarization splitter / coupler
- variable lightwave functional circuit as described above disposed between the third port of the polarization splitter / coupler and the optical power bra;
- the wavelength multiplexed light including the plurality of pulses at the first wavelength interval is converted into the wavelength multiplexed light including the plurality of pulses at the second wavelength interval according to the side pressure applied to the polarization maintaining optical fiber, and Provided is a variable lightwave function device that outputs from a bra.
- An acousto-optic modulator that outputs wavelength-multiplexed light including a plurality of pulses at a first wavelength interval, and an optical power bra arranged at an output of the acousto-optic modulator,
- a polarization branching coupler having first to third ports, and branching the output of the optical power bra incident from the first port to the second and third ports;
- An optical amplifier connected to a second port of the polarization splitter / coupler
- variable lightwave functional circuit as described above disposed between the second port of the polarization splitter / coupler and the optical amplifier;
- FIG. 1 is a configuration diagram of a first embodiment of an optical fiber type variable lightwave function circuit.
- FIG. 2 is a configuration diagram of a variable lightwave function circuit according to a second embodiment.
- FIG. 3 is a configuration diagram of a variable lightwave function circuit according to a third embodiment.
- Figure 4 is a characteristic diagram of the periodic optical filter.
- FIG. 5 is a configuration diagram of a variable lightwave function circuit according to a fourth embodiment.
- Figure 6 is a diagram of the variable wavelength spacing multi-wavelength oscillation spectrum (1).
- FIG. 7 is a configuration diagram of a variable lightwave function circuit according to a fifth embodiment.
- Figure 8 is a diagram of the variable wavelength spacing multi-wavelength oscillation spectrum (2).
- FIG. 9 is a configuration diagram of a variable lightwave function circuit according to a sixth embodiment.
- FIG. 10 is an explanatory diagram of input and output optical pulse trains.
- FIG. 1 shows a configuration diagram of a first embodiment of an optical fiber type variable lightwave functional circuit according to the present invention.
- This circuit includes a polarization maintaining optical fiber (PMF) 1 of a certain length, polarizers 2 and 3 at both ends, a rotator 4, and an application unit 5 for applying a lateral pressure.
- PMF polarization maintaining optical fiber
- the input light is made incident through the polarizer 2, and the output light is emitted through the PMF 1 and the other polarizer 3.
- the input light is, for example, signal light used for optical communication, and is usually transmitted from a semiconductor laser. Is modulated by a signal.
- the PMF 1 has two orthogonal polarization axes, and the polarization axis of the polarizer 2 is coupled so as to coincide with one of the polarization axes of the PMF “1.
- polarization mode coupling is induced by applying a lateral pressure to the PMF 1.
- the predetermined angle is set to, for example, 45 °, efficient polarization is achieved.
- a 45 ° rotator 4 is provided on one polarizer 2 side instead of the polarizer 2.
- one of the polarizers 2 and 3 is used instead.
- One of them may be connected or arranged at an angle of 45 with respect to the polarization axis of PMF 1. Further, by applying a lateral pressure to PMF 1, the polarization axes of polarizer 2 and PMF 1 are substantially changed. 45.
- the light may be coupled at an angle, and the predetermined angle is not limited to 45 ° and may be an appropriate angle.
- the axis is coupled so as to coincide with one of the polarization axes of the PMF 1.
- a member such as wood, plastic, or metal from the side of the PMF 1 is used.
- the PMF 1 may be sandwiched between clips such as a binder clip, etc.
- the application unit 5 can also adjust the magnitude of the force by the lateral pressure in this direction.
- B n x -n y mode birefringence
- G the velocity of light.
- the rotation angle at this time can be changed depending on the magnitude of the lateral pressure.
- S (m) is a transfer matrix of a PMF of length I
- m is a parameter representing a delay between X and Y polarizations.
- C (0,) is a matrix that gives a shift of only the phase ⁇ , and the phase shift is realized by finely adjusting the pressure ⁇ ] application position, not at exactly equal intervals.
- R ( ⁇ ,) is a rotation matrix that rotates the polarization by an angle of 0, and the application of pressure induces polarization rotation.
- M f can be expressed as the following equation (3) as a unitary matrix. Therefore, as the Jones matrix T of the entire optical fiber type variable light wave functional circuit, the following equation (4) is obtained.
- the present invention can realize the same function as the optical lattice circuit [1] [3] based on the PMF rotation connection structure proposed by Koseki et al. Of Sophia University. That is, the optical fiber type 1 variable light wave function circuit and the variable light wave function circuit (optical lattice circuit) of the present invention are characterized by changing the position and magnitude of the lateral pressure as compared with those based on the PMF rotary connection structure. ⁇ The functions are variable, and it is easy to precisely match the PMF length 1 of the basic structure.
- optical fiber type variable lightwave function circuit of the present invention The functions that can be realized by the optical fiber type variable lightwave function circuit of the present invention are exemplified below.
- Periodic optical filter An optical filter whose transmission wavelengths are arranged at equal intervals. The period can be changed, and it can be used for a multi-wavelength light source.
- Optical bandpass filter This is a so-called So Ic type optical filter. Center wavelength , Bandwidth can be variable.
- Wavelength add / drop circuit A circuit that extracts only one or several wavelengths from a WDM signal. The extraction wavelength can be changed.
- Pulse multiplexing circuit A circuit that delays the repetition frequency of the pulse train from the pulse light source. The delay multiple can be made variable.
- Optical amplifier gain equalization circuit A circuit that equalizes and flattens the gain wavelength characteristics of an optical fiber amplifier. The wavelength characteristics of the circuit can be varied according to the characteristics of each amplifier.
- Optical fiber chromatic dispersion compensating circuit The chromatic dispersion of optical fiber can be compensated by flattening the wavelength characteristic of the amplitude of the circuit and making the wavelength characteristic of group velocity reverse to that of the optical fiber.
- the wavelength characteristics of the group velocity can be varied according to the type and length of the optical fiber.
- the optical lattice circuit whose characteristics are not variable has already been realized by Jinguji Temple and others at NTT as a planar optical integrated circuit (PLC) using a repetitive Mach-Zehnder optical circuit structure, and has realized various functions. A design method for this has also been proposed [1] [2]. In designing the variable lightwave functional circuit of the present invention for performing these functions, for example, the design method proposed by Jinguji Temple of NTT as described above can be used.
- the optical fiber type variable lightwave functional circuit of the first embodiment has polarization dependency because the polarizers 2 and 3 are used. A configuration that solves this and makes the polarization independent will be described below.
- FIG. 2 shows a configuration diagram of a variable lightwave functional circuit according to a second embodiment of the present invention.
- This embodiment is a polarization-independent optical fiber type variable lightwave function circuit.
- FIG. 2 (a) shows a configuration diagram in which the optical fiber type variable lightwave function circuit of FIG. 1 is made polarization independent.
- the variable lightwave function circuit includes a PMF 21, a polarization beam splitter (PBS) 22, a rotor 23, and a side pressure applying unit 25.
- the PMF 21 is joined from the application unit 25 or by being inclined with the PBS 22 so that the polarization axis of the light from the PBS 22 is incident on one side at an inclination of, for example, 45 ° and output to the other.
- the light output from 1 is adjusted so that the polarization axis is further tilted by 45 ° by the rotator 23 and passes through the PBS 22. Thus, output light is output from the PBS 22.
- the rotor 23 may be omitted. In this case, the light output from the PMF 1 has a component in the direction of the polarization axis. Further, the polarization axis may be adjusted by the application unit 25.
- Fig. 2 (b) shows a block diagram of an optical fiber-type variable lightwave functional circuit of the Sanyak interferometer type [5] [6].
- This configuration is slightly different in operation from the above-described circuits, but has the advantage that it can be composed entirely of optical fibers. That is, the variable wave function circuit includes a 50% fiber force bra 32 formed by using the PMF 31 and a side pressure applying unit 35.
- the Jones matrix T of the entire circuit shown in Fig. 2 (b) is polarization-independent in the form of Eq. (7).
- the polarization independent optical fiber type variable A lightwave functional circuit can be realized.
- FIG. 3 shows a configuration diagram of a variable lightwave function circuit according to a third embodiment of the present invention.
- This embodiment shows a periodic optical filter using an optical fiber type variable lightwave function circuit.
- a periodic optical filter having the above function (1) was created by using the optical fiber type variable light wave function circuit of FIG. 1, and a multi-wavelength light source capable of changing the wavelength interval was realized.
- the position of the lateral pressure by the application unit 5 may be a point as shown in the figure. If the position of the lateral pressure by the application unit 5 is set at a distance from the light entrance of the PMF 1, this transmission characteristic becomes a sinusoidal wave as shown in equation (8), with the rotation angle being 0.
- Figure 4 shows a characteristic diagram of the periodic optical filter.
- Fig. 4 (a) is a diagram showing the periodic transmission characteristics of the actually manufactured periodic optical filter. The solid line indicates the distance L of 2. Om, and the broken line indicates the distance L of 8. Om. From this figure, it can be seen that a sinusoidal periodic transmission characteristic is obtained by the variable lightwave function circuit of the present invention.
- Fig. 4 (b) shows the dependence of the wavelength interval on the lateral pressure position. As shown in the figure, the wavelength interval ⁇ is inversely proportional to the lateral pressure position L. In this example, the relationship between the wavelength interval and the lateral pressure position L is as shown in equation (10) from FIG. 4 (b).
- FIG. 5 shows a configuration diagram of a variable lightwave function circuit according to a fourth embodiment of the present invention.
- This embodiment is a configuration diagram of a variable wavelength interval multi-wavelength optical fiber laser.
- the periodic optical filter as shown in the above embodiment is inserted into the erbium-doped optical fiber laser resonator shown in the figure, and the wavelength interval is variable by the lateral pressure applied to the PMF.
- Wavelength optical fiber laser was realized.
- this optical fiber laser has a Faraday Rotator Mirror (FRM) 51, an erbium-doped optical fiber (EDF) 52, a wavelength division multiplexing coupler (WDM). Mu Itiplexing) Power Bra) 53, PBS 54, pumping semiconductor laser 55, isolators 56 and 58, polarization controller 57, 10% power bra 59, and spectrum analyzer 60.
- FFM Faraday Rotator Mirror
- EDF erbium-doped optical fiber
- WDM wavelength division multiplexing coupler
- Mu Itiplexing) Power Bra) 53 PBS 54
- pumping semiconductor laser 55 isolators 56 and 58
- polarization controller 57 polarization controller 57
- 10% power bra 59 and spectrum analyzer 60.
- a periodic optical filter a thick line portion, that is, a PMF 1, polarizers 2 and 3, and an applying section 5 are provided, and the applying section 5 applies a pressure to one point in the PMF 1 as an example, so that the periodic An optical fiber
- the FRM51 is a mirror that gives polarization rotation by the Faraday effect.
- the EDF 52 oscillates a laser beam having a wavelength of 1.55 jUm, for example.
- the pumping semiconductor laser 55 emits, for example, 1.48 jum of pumping light.
- the 01 ⁇ 1 coupler 53 is, for example, an optical fiber power coupler for multiplexing 1.48 m pumping light from the pumping semiconductor laser 55 and 1.55 m laser light from the EDF 52.
- the tram analyzer 60 is not a part of the optical fiber laser of the present embodiment, but actually observes the spectrum of the laser light output through the coupler 59 and the isolator 58, and actually oscillates at multiple wavelengths. It is a measuring instrument for confirming.
- An erbium-doped fiber laser is composed of FRM51, EDF52, WDM force brass 53, semiconductor laser 55 for excitation, and the like.
- the EDFA is excited by multiplexing a 1.48 im semiconductor laser 55 for excitation with a WDM force bra 53 and oscillates in a laser.
- the output light of the ED FA is split by the PBS 54.
- One branch destination is input to a periodic optical filter having a PMF 1 and polarizers 2 and 3 via an isolator 56 and a polarization controller 57.
- the output light passes through a 10% power blur 59 and is output as a laser output.
- it is input to the spectrum analyzer 60 for measurement.
- the output light also enters the BS 54 from the 10% coupler 54.
- the polarization axis coincides with the polarization axis transmitted through the PBS 54, and the incident light is propagated to the EDFA side and is resonated. Note that the other branched light branched by the PBS 54 is blocked by the isolator 56 from propagating.
- FIG. 6 shows a diagram of the variable wavelength spacing multi-wavelength oscillation spectrum (1). This is a spectrum when the multi-wavelength oscillation is realized by using the gain medium having a non-uniform spread by cooling the erbium-doped optical fiber / ⁇ with liquid nitrogen.
- FIG. 6 (a) shows an example in which the length of the PMF 1 is 1 Om, the distance for applying the lateral pressure is 4 m, and FIG. 6 (b) is the case where the distance is 8 m.
- oscillation occurs at different wavelength intervals corresponding to the respective side pressure application positions by the application unit 5.
- FIG. 7 shows a configuration diagram of a fifth embodiment of the variable lightwave function circuit of the present invention.
- This embodiment shows a wavelength-interval variable multi-wavelength optical fiber laser.
- this embodiment uses an acousto-optic modulator (AO) in the resonator instead of liquid nitrogen cooling. : Achieving multi-wavelength oscillation at room temperature by introducing Acoust-Optic Modulator).
- This optical fiber laser includes FRM71, AOM72, 10% coupler 73, PBS74, erbium-doped optical fiber laser (EDFA) 75, PCs 76 and 77 from the above-mentioned periodic filter.
- the thick part, that is, the PMF 1 and the application unit 5 realize an optical fiber filter having periodic transmission characteristics as described above. Also in this case, oscillation occurs at an appropriate wavelength interval according to the position of the lateral pressure applied to the PMF 1 by the application unit 5 and the Z or pressure.
- AOM72 can shift the frequency of light by the frequency of acoustic waves. E Due to its characteristics, the DFA75 does not oscillate at multi-wavelengths at room temperature.For example, it is necessary to cool down to 196 ° C with liquid nitrogen (LN 2 ), but the oscillation threshold becomes infinite by adding AOM72. Since no oscillation occurs, multi-wavelength output can be obtained even at room temperature.
- LN 2 liquid nitrogen
- Figure 8 shows a diagram of the variable wavelength spacing multi-wavelength oscillation spectrum (2). This is a spectrum when realizing multi-wavelength oscillation at room temperature by AOM.
- the length of the PMF 1 is 1 Om
- the distance L for applying the lateral pressure is 2.3 m
- FIG. 6 (b) is 8.25 m.
- oscillation occurs at a wavelength interval corresponding to the position and pressure of the lateral pressure applied to the PM F 1 by the application unit 5.
- FIG. 9 is a configuration diagram of a variable lightwave function circuit according to a sixth embodiment of the present invention.
- This embodiment shows a pulse multiplexing circuit.
- a pulse multiplexing circuit having the above function (1) was realized as shown in the figure.
- the N-th from the 0-th for applying lateral pressure to the PMF 1 1 the positions of the (N integer), interval 2 N L from one end of the PMF 1 1 until the 0-th (L: predetermined Length), the interval between the 0th and 1st is 2 N _ 1 and ''', the interval between the k-th and 2nd-kth is 2N- 1kL , ⁇ -', the N-th
- the interval between the first and Nth is 2.
- a lateral pressure that gives equal rotation at each position is applied.
- the polarization axis is rotated by 45 ° at each position by the lateral pressure caused by the force.
- the rotation is not limited to this, and an appropriate rotation may be applied.
- the polarization axis may be rotated by a predetermined angle by the lateral pressure or the manner of joining.
- FIG. 10 is an explanatory diagram of the input and output optical pulse trains.
- FIG. 10 (a) An optical pulse train as shown in FIG. 10 (a) is input from the left side in the figure.
- the pulse repetition frequency is 1 OGHz, which is used for communication of 1 OGbitZs.
- This is input to the variable lightwave function circuit of the embodiment of FIG. 6 and when an appropriate pressure is applied to N points, the repetition frequency is set to 2Nth power due to the delay characteristic of the xy polarization axis of the PMF 11. And the pulses are multiplexed. Thereby, it can be used for communication at a higher speed than the input laser light.
- an optical fiber type variable lightwave function circuit and a variable lightwave function device which can cope with a change in the configuration of a WDM optical network and have various functions can be provided. be able to.
- WDM optical network, optical communication It can be applied to an optical communication device such as a receiver.
- variable lightwave functional circuit such as a filter and a variable lightwave functional device can be realized.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
- Optical Communication System (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
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Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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DE60223504T DE60223504T2 (de) | 2001-03-08 | 2002-03-05 | Schaltung und einrichtung für variable lichtwellenfunktion |
US10/469,243 US7130495B2 (en) | 2001-03-08 | 2002-03-05 | Variable lightwave function circuit and variable lightwave function device |
EP02702737A EP1367427B1 (en) | 2001-03-08 | 2002-03-05 | Variable light wave function circuit and variable light wave function device |
US11/439,219 US7231104B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
US11/439,148 US7200291B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
US11/439,218 US7231103B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2001-65351 | 2001-03-08 | ||
JP2001065351A JP3360074B2 (ja) | 2001-03-08 | 2001-03-08 | 可変光波機能回路及び可変光波機能装置 |
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US10469243 A-371-Of-International | 2002-03-05 | ||
US11/439,218 Division US7231103B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
US11/439,219 Division US7231104B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
US11/439,148 Division US7200291B2 (en) | 2001-03-08 | 2006-05-24 | Variable lightwave functional circuit and variable lightwave functional apparatus |
Publications (1)
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WO2002073294A1 true WO2002073294A1 (en) | 2002-09-19 |
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PCT/JP2002/002031 WO2002073294A1 (en) | 2001-03-08 | 2002-03-05 | Variable light wave function circuit and variable light wave function device |
Country Status (5)
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US (4) | US7130495B2 (ja) |
EP (2) | EP1640789B1 (ja) |
JP (1) | JP3360074B2 (ja) |
DE (2) | DE60228344D1 (ja) |
WO (1) | WO2002073294A1 (ja) |
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WO2006008830A1 (en) * | 2004-07-22 | 2006-01-26 | Fujitsu Limited | All-optical polarization rotation switch using a loop configuration |
KR100658532B1 (ko) * | 2004-12-02 | 2006-12-15 | 한국과학기술연구원 | 가변 다채널 필터 |
US8223341B2 (en) * | 2010-05-28 | 2012-07-17 | Honeywell International Inc. | System and method for enhancing signal-to-noise ratio of a resonator fiber optic gyroscope |
US8213019B2 (en) | 2010-09-07 | 2012-07-03 | Honeywell International Inc. | RFOG with optical heterodyning for optical signal discrimination |
FR2977988B1 (fr) * | 2011-07-11 | 2014-03-07 | Ecole Polytech | Dispositif et procede passif de combinaison coherente de deux faisceaux optiques amplifies et/ou elargis spectralement. |
US8947671B2 (en) | 2013-02-22 | 2015-02-03 | Honeywell International Inc. | Method and system for detecting optical ring resonator resonance frequencies and free spectral range to reduce the number of lasers in a resonator fiber optic gyroscope |
US9001336B1 (en) | 2013-10-07 | 2015-04-07 | Honeywell International Inc. | Methods and apparatus of tracking/locking resonator free spectral range and its application in resonator fiber optic gyroscope |
JP6613949B2 (ja) * | 2016-02-16 | 2019-12-04 | ウシオ電機株式会社 | 偏光素子ユニットおよび偏光光照射装置 |
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JPS63249827A (ja) * | 1987-04-06 | 1988-10-17 | Nippon Telegr & Teleph Corp <Ntt> | 光パルス多重化回路 |
JPH05323396A (ja) * | 1992-03-24 | 1993-12-07 | Nippon Telegr & Teleph Corp <Ntt> | 光周波数変換装置 |
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US4529262A (en) * | 1983-05-09 | 1985-07-16 | At&T Bell Laboratories | Inline optical fiber attentuator |
US4801189A (en) * | 1983-11-30 | 1989-01-31 | The Board Of Trustees Of The Leland Stanford Junior University | Birefringent fiber narrowband polarization coupler and method of coupling using same |
US4666255A (en) * | 1984-06-25 | 1987-05-19 | Sachs/Freeman Associates, Inc. | Method and apparatus for acousto-optically shifting the frequency of a light signal propagating in a single-mode fiber |
DE3728107A1 (de) * | 1987-08-22 | 1989-03-02 | Philips Patentverwaltung | Polarisationsverwuerfler |
US5018859A (en) * | 1989-01-26 | 1991-05-28 | Honeywell Inc. | Fiber optic gyroscope balanced plural serrodyne modulators phase difference control |
JPH0933872A (ja) * | 1995-07-19 | 1997-02-07 | Fuji Elelctrochem Co Ltd | 光ファイバ偏波制御器 |
DE19807891A1 (de) * | 1998-02-25 | 1999-08-26 | Abb Research Ltd | Faserlaser-Drucksensor |
US6417948B1 (en) * | 1999-12-24 | 2002-07-09 | Corning Incorporated | Variable delay device for an optical component such as a polarization mode dispersion compensator |
US6556732B1 (en) * | 2000-06-07 | 2003-04-29 | Corning Incorporated | All fiber polarization mode dispersion compensator |
US7126693B2 (en) * | 2004-03-29 | 2006-10-24 | Carl Zeiss Meditec, Inc. | Simple high efficiency optical coherence domain reflectometer design |
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- 2001-03-08 JP JP2001065351A patent/JP3360074B2/ja not_active Expired - Fee Related
-
2002
- 2002-03-05 EP EP06000005A patent/EP1640789B1/en not_active Expired - Fee Related
- 2002-03-05 EP EP02702737A patent/EP1367427B1/en not_active Expired - Lifetime
- 2002-03-05 US US10/469,243 patent/US7130495B2/en not_active Expired - Fee Related
- 2002-03-05 WO PCT/JP2002/002031 patent/WO2002073294A1/ja active IP Right Grant
- 2002-03-05 DE DE60228344T patent/DE60228344D1/de not_active Expired - Lifetime
- 2002-03-05 DE DE60223504T patent/DE60223504T2/de not_active Expired - Lifetime
-
2006
- 2006-05-24 US US11/439,218 patent/US7231103B2/en not_active Expired - Fee Related
- 2006-05-24 US US11/439,148 patent/US7200291B2/en not_active Expired - Fee Related
- 2006-05-24 US US11/439,219 patent/US7231104B2/en not_active Expired - Fee Related
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JPS63249827A (ja) * | 1987-04-06 | 1988-10-17 | Nippon Telegr & Teleph Corp <Ntt> | 光パルス多重化回路 |
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Also Published As
Publication number | Publication date |
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JP2002268022A (ja) | 2002-09-18 |
EP1367427A4 (en) | 2005-06-08 |
US20060251354A1 (en) | 2006-11-09 |
JP3360074B2 (ja) | 2002-12-24 |
US20050100262A1 (en) | 2005-05-12 |
US20060233480A1 (en) | 2006-10-19 |
US7130495B2 (en) | 2006-10-31 |
US7231103B2 (en) | 2007-06-12 |
DE60223504D1 (de) | 2007-12-27 |
US20060233488A1 (en) | 2006-10-19 |
EP1640789B1 (en) | 2008-08-13 |
DE60223504T2 (de) | 2008-09-11 |
EP1640789A1 (en) | 2006-03-29 |
EP1367427A1 (en) | 2003-12-03 |
US7200291B2 (en) | 2007-04-03 |
EP1367427B1 (en) | 2007-11-14 |
DE60228344D1 (de) | 2008-09-25 |
US7231104B2 (en) | 2007-06-12 |
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