WO1998038709A1 - Emetteur optique, repeteur optique et dispositif d'interconnexion optique - Google Patents
Emetteur optique, repeteur optique et dispositif d'interconnexion optique Download PDFInfo
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- WO1998038709A1 WO1998038709A1 PCT/JP1998/000670 JP9800670W WO9838709A1 WO 1998038709 A1 WO1998038709 A1 WO 1998038709A1 JP 9800670 W JP9800670 W JP 9800670W WO 9838709 A1 WO9838709 A1 WO 9838709A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/073—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an out-of-service signal
- H04B10/0731—Testing or characterisation of optical devices, e.g. amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1301—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers
- H01S3/13013—Stabilisation of laser output parameters, e.g. frequency or amplitude in optical amplifiers by controlling the optical pumping
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0078—Frequency filtering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10015—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by monitoring or controlling, e.g. attenuating, the input signal
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/23—Arrangements of two or more lasers not provided for in groups H01S3/02 - H01S3/22, e.g. tandem arrangements of separate active media
- H01S3/2383—Parallel arrangements
- H01S3/2391—Parallel arrangements emitting at different wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0037—Operation
- H04Q2011/0039—Electrical control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0005—Switch and router aspects
- H04Q2011/0037—Operation
- H04Q2011/0049—Crosstalk reduction; Noise; Power budget
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0069—Network aspects using dedicated optical channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q2011/0079—Operation or maintenance aspects
- H04Q2011/0083—Testing; Monitoring
Definitions
- the present invention relates to an optical transmission device, an optical repeater, and an optical cross-connect device, and more particularly to an optical transmission device, an optical repeater, and an optical cross-connect device having an optical amplifier using an optical fiber doped with erbium or the like.
- an optical fiber in which erbium or the like is doped inside the node device and a light generated by an excitation light source are used.
- An optical transmission device having an amplifier is used.
- This optical transmission device has a function of receiving a data optical signal and a monitoring optical signal having different wavelengths from the upstream side, amplifying the data optical signal and outputting the amplified signal to the downstream side, or taking it into its own node device. In addition, it has a function to receive a monitoring optical signal and output a new monitoring optical signal to the downstream side, and to output a data optical signal carrying data from the own node device to the downstream side. are doing.
- the optical transmission device according to the related art includes two light sources, an excitation light source for exciting a doped fiber and a light source for a monitoring optical signal, for the functions described above.
- the optical transmission device according to the related technology described above must be provided with two types of light sources, and therefore, there is a problem that the number of components of the entire optical transmission device increases and the configuration becomes complicated. ing. Disclosure of the invention SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems of the related art, simplify the device configuration, and configure the optical transmission device, the optical repeater, the optical cross-connect device, the node device, and the optical network at a low cost. Is to provide.
- the object is to provide one or a plurality of doped fibers for amplifying an input optical signal by pump light, and a monitoring optical signal having a wavelength different from that of a data optical signal from the one or more doped fibers.
- an excitation light source for both the excitation light source for one or a plurality of the drop fibers and the light source for the monitoring optical signal is used. This is achieved by providing a monitoring light source.
- the object is to provide an optical power bra that distributes output light from the excitation / monitoring light source to the one or more doped fibers and the optical multiplexing device, wherein the excitation / monitoring light source is monitored information.
- an optical multiplexing element for separating an input optical signal into a monitoring optical signal and a data optical signal, and a monitoring optical signal receiver.
- the object is to provide an optical cross-connect device comprising: an optical switch including a plurality of input terminals and an output terminal for an optical signal; and a controller for controlling the optical switch.
- the optical transmission device includes the optical transmission device described above connected to each of the input terminal and the plurality of output terminals, or includes a plurality of data transmitters and a plurality of data receivers connected to the plurality of input terminals of the optical switch.
- the optical switch, the data transmitter, the data receiver, and the plurality of optical transmission devices are controlled by the controller. This is achieved by providing a light source for excitation and monitoring of the doped fiber required for the optical transmission device in common to the plurality of optical transmission devices.
- the object is to provide an optical cross-connect device comprising: an optical circuit having a plurality of input terminals and an output terminal of an optical signal; and a controller for controlling the optical circuit. This is achieved by including an element, a wavelength separation element, an optical amplifier or a regenerative repeater.
- the above object is to provide an optical network in which a plurality of node devices are connected to each other by a transmission line using an optical fiber, wherein each of the plurality of node devices is provided with the optical cross-connect device described above.
- This is achieved by providing an optical repeater including the above-described optical transmission device in the middle of a transmission path using an optical fiber connecting the node devices.
- FIG. 1 is a block diagram showing a basic configuration example of the optical transmission device of the present invention
- FIG. 2 is a block diagram showing another example of the basic configuration of the optical transmission device of the present invention
- FIG. 3 is a block diagram showing another example of the basic configuration of the optical transmission device of the present invention
- FIG. 4 is another block diagram of the basic configuration of the optical transmission device of the present invention.
- FIG. 5 is a block diagram illustrating an example
- FIG. 5 is a block diagram illustrating a configuration example of an optical transmission device of the present invention
- FIG. 6 is a block diagram illustrating another example of a configuration of the optical transmission device of the present invention.
- FIG. 7 is a block diagram showing another example of the configuration of the optical transmission device of the present invention
- FIG. 1 is a block diagram showing a basic configuration example of the optical transmission device of the present invention
- FIG. 2 is a block diagram showing another example of the basic configuration of the optical transmission device of the present invention.
- FIG. 3 is a block diagram showing another
- FIG. 8 is a block diagram showing another example of the configuration of the optical transmission device of the present invention.
- FIG. 9 is a block diagram showing a configuration example of the optical repeater of the present invention.
- FIG. 10 is a block diagram showing another example of the configuration of the optical repeater of the present invention.
- FIG. 11 is a block diagram illustrating an example of a transmission system configured using the optical repeater of the present invention.
- FIG. 12 is an optical cross-connect device of the present invention.
- FIG. 13 is a diagram for explaining an example of the optical cross-connect device of the present invention.
- FIG. 14 is a diagram illustrating another example of the optical device,
- FIG. 14 is a diagram illustrating a configuration example of an optical circuit of the optical cross-connect device of the present invention, and FIG.
- FIG. 15 is a diagram illustrating the optical cross-connector of the present invention.
- FIG. 16 is a diagram for explaining another example of the configuration of the optical circuit of the optical fiber connection device.
- FIG. 16 is a diagram for explaining another example of the configuration of the optical circuit of the optical cross-connect device of the present invention.
- FIG. 14 is a diagram illustrating another example of the configuration of the optical circuit of the optical cross-connect device of the present invention.
- FIG. 18 is a diagram illustrating another example of the configuration of the optical circuit of the optical cross-connect device of the present invention.
- FIG. 19 is a diagram for explaining still another example of the optical cross-connect device of the present invention, and
- FIG. 20 is a diagram of a supervisory signal transmitting / receiving device of the optical cross-connect device of the present invention.
- FIG. 20 is a diagram of a supervisory signal transmitting / receiving device of the optical cross-connect device of the present invention.
- FIG. 21 is a diagram for explaining a configuration example.
- FIG. 22 is a diagram for explaining a configuration example.
- FIG. 22 is a diagram for explaining a configuration example of a monitoring signal transmitting / receiving device of the optical cross-connect device of the present invention.
- FIG. 23 is an optical cross-connect device of the present invention.
- FIG. 24 is a diagram for explaining a configuration example of the monitoring signal transmitting / receiving device of FIG. 24.
- FIG. 24 is a diagram for explaining another example of the configuration of the optical circuit of the optical cross-connect device of the present invention.
- FIG. 26 is a diagram illustrating still another example of the optical cross-connect device of the present invention.
- FIG. 26 is an optical network configured by a node device configured using the optical cross-connect device of the present invention.
- FIG. 1 is a block diagram showing a basic configuration of an optical transmission device according to an embodiment of the present invention
- FIG. 2 is a block diagram showing another example of a basic configuration of the optical transmission device according to an embodiment of the present invention.
- 11 is a doped fiber doped with erbium or the like
- 12 and 14 are wavelength multiplexing elements
- 13 is An isolator
- 15 is an optical power blur
- 16 is a light source for excitation and monitoring
- 17 is a driver
- 18 is a bidirectional wavelength multiplexing element.
- the optical transmission apparatus according to the embodiment of the present invention shown in FIGS. 1 and 2 shows only the functions of amplifying and transmitting the input optical signal for data and transmitting the optical signal for monitoring. Although it can be used as a transmission side device having data to be used, the function of capturing a monitoring signal is omitted, but this function can be added as a known device configuration.
- the optical transmission device shown in FIG. 1 has a doped fiber 11 1 which amplifies an optical signal for data of the wavelength of Id; A wavelength multiplexing element 12 for inputting pumping light to the doped fiber 11 and an optical isolator for transmitting the amplified data optical signal from the wavelength multiplexing element 12 only in a predetermined direction, in the example shown, to the right. 13; a wavelength multiplexing element 14 for multiplexing the amplified optical signal for data and wavelength; an optical signal for monitoring Ip and outputting the multiplexed optical signal to the downstream optical fiber; and a wavelength for excitation and monitoring.
- An excitation / monitoring light source 16 that emits Ip light
- an optical power brah 15 that distributes the excitation / monitoring light from the light source 16 to the wavelength division multiplexing device at a fixed ratio N: 1.
- a driver 17 that controls the light source 16 by adding monitoring information and a DC signal. It is.
- the optical isolator 13 is disposed between the wavelength division multiplexing elements 12 and 14. However, the optical isolator 13 is located at a different location. Also, it need not be used. Further, the wavelength multiplexing device 12, the wavelength multiplexing device 14, and the optical power bra 15 can be integrally formed as an optical circuit.
- the characteristic point of the optical transmission device according to the embodiment of the present invention shown in FIG. 1 is that the light source for exciting the dope fiber 11 and the light source for monitoring information are only the light source for excitation and monitoring 16. It is covered. That is, the excitation and monitoring light source 16 is a light source for exciting the doped fiber 11 and a light source for monitoring information. Outputs light of wavelength IP that can be used as a source. This light is divided into a predetermined ratio N: 1 by a power bra 15 and the light divided at a ratio “N” is converted into a doped fiber 11 through a wavelength multiplexing element 12. To excite the doping fin.
- the light split at the ratio "1" is input to the wavelength multiplexing element 14 as a monitoring optical signal together with the amplified data optical signal input through the isolator 13 and multiplexed. Output to the downstream optical fiber.
- N is a numerical value determined by the ratio between the power of the pumping light required by the doped fiber and the power required by the monitoring optical signal, and generally may be 10 to several hundreds. .
- the power of the output light of the pumping / monitoring light source 16 must be equal to or greater than the sum of the power of the pumping light required by the doped fiber and the power required by the monitoring optical signal. You.
- the excitation / monitoring light source 16 is controlled by a driver 17 that receives a DC signal DC and monitoring information, so that the output light is modulated by the monitoring information and its power Are controlled by the DC signal DC. Then, as described above, a part of the output light is input to the wavelength multiplexing element 14 as a monitoring optical signal together with the amplified data optical signal input via the isolator 13 and multiplexed. After that, it is output to the downstream optical fiber. Also, since a part of the modulated optical output is supplied to the doped fiber 11 and the bit rate of the power monitoring information for exciting the doped fiber is low, the doped fiber 11 has the modulated excitation light. It is excited without being affected.
- the optical transmission device according to the embodiment of the present invention shown in FIG. 2 is a bidirectional wavelength multiplexing device 1 instead of the wavelength multiplexing devices 12 and 14 and the optical isolator 13 in the optical transmission device described with reference to FIG. 8 and the other configuration is the same as that of FIG.
- the device provided the output light from the excitation / monitoring light source 16 divided by the bidirectional wavelength division multiplexing device 18 optical power brass 15 as the excitation light to the doped fiber 11 and amplified it.
- the optical signal for data and the optical signal for monitoring from the excitation / monitoring light source 16 divided by the optical power blur 15 are output to the optical fiber on the downstream side.
- the light source for exciting the doped fiber 11 and the light source for monitoring information are combined into one excitation and monitoring light source 16.
- the optical transmission device can also be used, and the configuration of the optical transmission device can be simplified. Further, in the configuration shown in FIGS. 1 and 2, the data optical signal is described as a signal of one wavelength, but the data optical signal may be a wavelength multiplexed signal.
- FIG. 3 is a block diagram showing a basic configuration of an optical transmission device according to another embodiment of the present invention
- FIG. 4 is another example of a basic configuration of the optical transmission device according to the embodiment of the present invention.
- FIG. In FIGS. 3 and 4 reference numeral 19 denotes a modulator, and other reference numerals are the same as those in FIGS. 1 and 2.
- the optical transmission device described with reference to FIGS. 1 and 2 inputs monitoring information to a driver 17 that controls a pumping / monitoring light source 16 and outputs the output light of the pumping / monitoring light source 16.
- the modulation is performed by the monitoring information
- the optical transmission device according to the embodiment of the present invention shown in FIGS. 3 and 4 is configured by separately providing a modulator for the monitoring information. The operation may be the same as that of the optical transmission device described in FIGS. 1 and 2.
- the optical transmission device is basically the same as the optical transmission device shown in FIG. 1, and includes an amplified optical signal for data (wavelength I d) and an optical signal for monitoring.
- a wavelength multiplexing element 14 that multiplexes the signal and outputs it to the downstream optical fiber, and light that is distributed at a fixed ratio N: 1 so that the output light from the light source 16 can be used for excitation and monitoring.
- FIG. 3 does not show the optical device, it can be provided in the same manner as in FIG.
- the optical transmission device according to the embodiment of the present invention shown in FIG. 4 is basically the same as the optical transmission device shown in FIG. 2, and the input terminal of the monitoring optical signal of the bidirectional wavelength multiplexing element 18 is provided.
- the difference from FIG. 2 is that 19 is inserted. Therefore, also in this embodiment, the driver 17 only needs to control the power of the output light of the excitation / monitoring light source 16 by the DC signal DC.
- the pumping / monitoring light source 16 does not modulate the pumping output light, so that the doped fiber 11 It can be excited by light, and even when the bit rate of the monitoring information becomes high, the doped fiber 11 can be excited reliably.
- the data optical signal is described as a signal of one wavelength, but the data optical signal may be a wavelength multiplexed signal.
- FIG. 5 is a block diagram showing the configuration of the optical transmission device according to the embodiment of the present invention.
- 11 a to 11 n are doped fibers
- 12 a to 12 n are wavelength multiplexing elements
- 20 is a star power blur
- other symbols are the same as those in FIG. is there.
- This embodiment of the present invention is an application example of the embodiment shown in FIG. 3, in which the present invention is applied to a wavelength multiplexing type optical transmission device.
- the optical transmission device shown in Fig. 5 the wavelength ⁇ di ⁇ ; each and a plurality of doped fiber 1 1 a ⁇ 1 1 n for amplifying a plurality of data optical signal id n, these A wavelength multiplexing element 12 a provided for each of the doped fibers 11 a to 11 n for supplying pump light to the doped fibers 11 a to 11 n and transmitting an amplified optical signal for data.
- wavelength multiplexing element 14 for multiplexing Ip monitoring optical signal and outputting to downstream optical fiber, and input light based on monitoring information
- a modulator 19 that modulates and sends the modulated light to the wavelength multiplexing element 14 and the output light from the pumping and monitoring light source 16 to the wavelength multiplexing elements 12a to 12n and the modulator 19 20 and excitation and monitoring wavelengths; an excitation and monitoring light source 16 that emits IP light, and a DC signal DC added to control the power of the output light of the light source 16 It is composed of
- the data optical signal have been described I Dt ⁇ scan d n as their respective wave signals, the data optical signal I o ⁇ lambda d n are each It may be a wavelength multiplexed signal.
- the wavelengths of the pumping light and the monitoring optical signal In the 1.48 m band, or in the 0.98 band, an optical signal for data is used; in this case, the wavelength of I di to I d resumeis 1.5 ⁇ m band. Things are used.
- FIG. 6 is a block diagram showing another configuration of the optical transmission device according to the embodiment of the present invention.
- reference numeral 11 'de notes a doped fiber
- reference numerals 12' and 14 'de note wavelength multiplexing elements
- the other reference numerals are the same as those in FIGS.
- This embodiment of the present invention is an application of the embodiment shown in FIG. To which the present invention is applied.
- the optical transmission device shown in FIG. 6, the wavelength; an optical transmission device I d physician lambda d 2 of the data optical signal is transmitted via independent optical fibers in opposite Direction, de - Pufaiba 1 1 the wavelength is constituted by the wavelength multiplexing element 1 2, 1 4 and modulator 1 9; configuration of a portion for relaying amplifies the data optical signal I d t is the identical to that of Figure 3, backwards wavelength; doped fiber 1 1 to relay by amplifying the I d 2 of the data optical signal ', wavelength multiplexing element 1 2', first in that the 1 4 'and modulator 1 9' are provided It is different from that shown in FIG.
- the 6 commonly shares the output light from the excitation and monitoring light source 16 with the wavelength multiplexing elements 12 and 12 ′ and the modulator 19. , 19 ′, an excitation / monitoring light source 16 that emits light of wavelengths for excitation and monitoring, and an output of a light source 16 to which a DC signal DC is applied. And a driver 17 for controlling the power of light.
- Graphics and di; and I d 2 may be transmitted in both directions through one optical fiber.
- the optical signal for data is described as a signal of one wavelength, but the optical signal for data may be a wavelength multiplexed signal.
- This embodiment can also be applied to the wavelength multiplexing type optical transmission device shown in FIG. 5, thereby forming a wavelength multiplexing type bidirectional optical transmission device. be able to.
- FIG. 7 is a block diagram showing another configuration of the optical transmission device according to the embodiment of the present invention, and the reference numerals in FIG. 7 are the same as those in FIG.
- the transmission direction of the data optical signal and the monitoring optical signal is assumed to be the same, but in this embodiment of the present invention, the transmission direction of the monitoring optical signal is changed.
- a doped fiber is provided on the output side of the data optical signal, and the monitoring information is provided between the wavelength multiplexing element 14 and the power braw 15 provided on the input side. 3 in that a modulator 19 is provided, and in other respects, the configuration is the same as that in FIG. With this configuration, the optical transmission device shown in FIG. 7 is configured such that the monitoring optical signal modulated by the monitoring information in the modulator 19 is inverted via the wavelength multiplexing element 14 from the data optical signal. Can be transmitted in any direction.
- FIG. 8 is a block diagram showing another configuration of the optical transmission device according to the embodiment of the present invention, and the reference numerals in FIG. 8 are the same as those in FIG.
- This embodiment of the invention makes it possible to excite the doped fiber from both directions.
- the optical transmission device according to the embodiment of the present invention shown in FIG. 8 has a wavelength composed of a doped fiber 11, wavelength multiplexing elements 12, 14 and a modulator 19;
- the configuration of the relaying section is exactly the same as that of Fig.
- the doped fiber 11 is pumped from both directions by the wavelength multiplexing elements 12 and 12 ′, and a large optical amplification can be obtained. Further, in this configuration, two doped fibers 11 can be provided in series at the positions shown in the figure, and in this case, a higher optical amplification can be obtained.
- the provision of only one excitation / monitoring light source 16 makes it possible to amplify the data optical signal with a large amplification factor, and However, it is possible to obtain an effect that this light source can be used also for monitoring information.
- the data optical signal is described as a signal of one wavelength, but the data optical signal may be a wavelength multiplexed signal.
- Each of the embodiments of the present invention described so far has been described as an optical transmission apparatus having only functions of amplifying and transmitting an input optical signal for data and transmitting an optical signal for monitoring.
- an embodiment of an optical repeater in which the above-described optical transmission device according to each embodiment of the present invention is provided with a function of taking in monitoring information from an upstream optical transmission device will be described.
- FIG. 9 is a block diagram showing a configuration example of an optical repeater according to another embodiment of the present invention
- FIG. 10 is a block diagram showing another configuration of the optical repeater according to the embodiment of the present invention.
- 11 "is a doped fiber, 12" is a wavelength division multiplexing element
- 91 is the optical transmission device described in the above embodiments
- 92 is a wavelength separation element
- 93 is A monitoring information receiver
- 94 is a controller
- 95 is an excitation light source.
- the optical repeater according to the embodiment of the present invention shown in FIG. 9 has the input of the optical transmission device 91 having the configuration according to the embodiment of the present invention described with reference to FIGS. 1 to 4 and FIG.
- an optical signal including a data optical signal and a monitoring optical signal from another optical repeater (not shown) connected to the preceding stage is a wavelength separation element. The signal is separated into an optical signal for data and an optical signal for monitoring by 2.
- the monitoring optical signal having the wavelength of Ip is converted into an electric signal by the monitoring information receiver and input to the controller 94.
- the data optical signal having the wavelength Id is supplied to the doped fiber 11 via the wavelength multiplexing element 11 together with the pumping light from the pumping light source 95 emitting the wavelength; Ip. And is input to the optical transmission device 91.
- the controller 94 which controls the entire optical repeater, creates electrical monitoring information to be transmitted to the subsequent stage based on the monitoring information from the monitoring information receiver 93, and sends it to the optical transmission device 91.
- the optical transmission device 91 generates a monitoring optical signal based on the monitoring information from the controller 94, and transmits the monitoring optical signal to the downstream side together with the input data optical signal.
- a pump light source 95 for pumping the doped fiber 11 " is provided, but this pump light source 95 is used for pumping provided in the optical transmission device 91. It can be shared with the monitoring light source and can be made unnecessary by making the connections shown by the dotted lines in FIG.
- the optical repeater according to the embodiment of the present invention shown in FIG. 10 includes a dope filter 11 ", a wavelength multiplexing element 12", and an excitation light source 95 in the optical repeater shown in FIG. And the function of amplifying the optical signal for data is deleted.
- This example is suitable for use when the optical transmission device 91 is configured with a doped fiber having a sufficient amplification degree, and has a simpler configuration and the same structure as the doped fiber shown in FIG. Function can be performed.
- a complete optical repeater having a function of capturing a monitoring signal can be simplified.
- the data light signal may be a signal of one wavelength or a wavelength multiplexed signal in which a plurality of wavelengths are multiplexed.
- FIGS. 9 and 10 has the configuration according to the embodiment of the present invention shown in FIGS. 1 to 4 and 8 as an optical transmission device 91.
- the present invention has been described as using the optical transmission device described above, the present invention uses the optical transmission device according to the embodiment of the present invention shown in FIG. 5 to FIG.
- An optical transmission device, a bidirectional optical transmission device, and an optical transmission device that transmits a monitoring optical signal in a direction opposite to that of a data optical signal can be configured.
- FIG. 1 is a diagram illustrating an example of a transmission system configured using the optical repeaters according to the embodiments of the present invention described above.
- reference numeral 111 denotes a transmitting optical transmission device, 112 a controller, 113 to 115 optical repeaters, and 116 a receiving optical transmission device.
- a transmission side optical transmission device 111 is provided at a data transmission end, receives a data optical signal from a data transmitter (not shown), and outputs an electric signal from a controller 112. Monitoring information is input.
- the transmission-side optical transmission device 111 for example, one of the optical transmission devices according to the embodiment of the present invention described in FIGS. 1 to 4 and FIG. 8 may be used.
- the optical repeater 111 converts the input optical signal for data into an optical signal amplified by the monitoring information from the controller 112 and a monitoring optical signal modulated by the monitoring information from the controller 112. Via an optical fiber transmission line with 15 Then, the signal is transmitted to the receiving-side optical transmission device 1 16.
- the optical repeaters 1 13 to 1 15 may use one of the optical repeaters according to the embodiment of the present invention described with reference to FIGS. 9 and 10, and the receiving side device 1 16 9 except for the optical transmission device 91 of the optical repeater described with reference to FIG. 9, and the output light of the doped fiber 11 "is connected to a data receiver (not shown).
- 16 may have a configuration excluding the optical transmission device 91 of the optical repeater described with reference to Fig. 10.
- the optical signal for data has one wavelength. Although described as a signal, this data optical signal may be a wavelength multiplexed signal.
- FIG. 12 is a view for explaining an example of an optical cross-connect device constituted by using the optical repeater according to the embodiment of the present invention described above.
- 1 2 1-1 to 1 2 1-n, 1 2 2-1 to 1 2 2-n are optical repeaters, 1 2 3 is an optical switch, and 1 2 4 is a controller.
- the example of the optical cross-connect device shown in FIG. 12 is an optical cross-connect device in which the optical repeater according to each of the above-described embodiments of the present invention is built in the optical cross-connect device, and has a large number of optical switch elements.
- Optical switch 1 2 3 having a function of switching an optical signal so as to transmit an optical signal from an arbitrary input terminal to an arbitrary output terminal, and a plurality of optical repeaters connected to the plurality of input terminals.
- 1 2 1— 1 to 1 2 1—n multiple optical repeaters 1 2 2—1 to 1 2 2—n connected to multiple output terminals, and controller 1 2 4 to control all of them It is configured with.
- the optical switch 123 has a large number of optical switch elements therein, so that light insertion loss occurs. For this reason, it is desirable that the plurality of optical repeaters 1 2 1-1 to 1 2 1-n connected to the input terminal of the optical switch 12 3 have an optical amplification function, as shown in FIG.
- the configuration is such that the optical transmission device 91 is removed from the optical repeater described with reference to FIG. Is connected to the optical switch 123.
- the excitation light sources 59 included in the plurality of optical repeaters 1 2 1 — 1 to 1 2 1 — n are arranged such that the entire optical repeaters 1 2 1 — 1 to 1 2 1 — n Only one can be provided and shared.
- the optical repeaters 1 2 1 — 1 to 1 2 1—]! Is large, the optical repeaters 1 2 1-1 to 1 2 1 — n have an amplification function.
- the optical repeaters 1 2 1— :! to 1 2 1—n are assumed to have the configuration excluding the optical transmission device 91 of the optical repeaters described with reference to FIG. Can be used.
- the plurality of optical repeaters 1 2 2 — 1 to 1 2 2 — n connected to the output terminal of the optical switch 1 2 3 use the optical repeater described with reference to FIG. 1 in the example shown in FIG. are doing.
- the optical repeaters 122-1 to 122-n the optical transmission devices described with reference to FIGS. 2 to 4 and 8 can be used.
- the controller 124 is separated from the optical signal input to each optical repeater from each of the optical repeaters 122 1-1 to 121-n. Receiving the monitoring information converted to an electrical signal and controlling the optical switch 123 based on this monitoring information or other control information, and outputting from the optical repeaters 1 2 1 — 1 to 1 2 1 — n The output data optical signal is output to the output-side optical repeaters 1 2 2—1 to 1 2 2—n. Also, the controller 124 adds necessary processing to the received monitoring information, and distributes each monitoring information to the optical repeaters 122-1 and 122 -n to which the monitoring information is to be sent. The excitation and monitoring light source 16 provided in each repeater is controlled.
- the controller 12 4 may be controlled.
- the excitation / monitoring light source 16 in the optical transmission device described with reference to FIGS. 1 2 2— 1 to 1 2 2—n Only one can be provided and shared as a whole. Furthermore, it can be shared as the excitation light source of the optical repeaters 1 2 1 _ 1 to 1 2 1—n. it can.
- the optical switch and a large number of optical repeaters included in the optical cross-connect device can be controlled by one controller, and also depends on the output power of the light source.
- one light source is used as both a light source for excitation and a light source for monitoring information, and this light source can be used also by a large number of optical repeaters, the apparatus can be made compact and inexpensive.
- the optical signal for data is described as a signal of one wavelength in the configuration shown in FIG. 12, the optical signal for data may be a wavelength multiplexed signal. In FIG.
- a wavelength demultiplexer is provided between the optical repeater 121 and the optical switch 123, and the optical switch 123 and the optical repeater 122 are provided. It is sufficient that a wavelength multiplexer is provided between the optical switch 1 and the optical switch 2. With this, it is possible to realize switching on an optical unit basis in the optical switch 123. In this case, since the number of optical signals to be switched increases, it is necessary to increase the size of the optical switch 123.
- FIG. 13 is a diagram for explaining another example of the optical cross-connect device constituted by using the optical repeater according to the embodiment of the present invention described above.
- 1 2 1— 1 ′ L 2 1— n ′, 1 2 2—1 ′ to 1 2 2— n ′ are optical repeaters
- 16 ′ is a monitoring light source
- 1 2 5 Is an optical circuit including an optical switch, and other reference numerals are the same as those in FIG. Embodiments of the optical circuit are shown in FIG. 14 to FIG.
- the optical cross-connect device shown in FIG. 13 is an example of a configuration in which the optical repeater does not have an amplification function. That is, the optical cross-connect device shown in FIG. 13 is composed of optical repeaters 1 2 1—1 ′ to 1 2 1—n ′ and 1 2 2—1 ′ to 1 2 2—n ′ having no amplification function.
- the optical repeaters 1 2 1— ⁇ ; I 2 1—n ′ have a function of separating and receiving the monitoring optical signal, and the optical repeaters 1 22— to 1 22—.
- ⁇ ' has a function of multiplexing the monitoring optical signal and the data optical signal and transmitting the multiplexed optical signal.
- the light source 16 'included in the optical repeaters 1 2 2-1' to 1 2 2 - ⁇ ' is used only as a monitoring light source.
- the light source wavelength Is may be outside the band of the erbium-doped fiber, and may be a 1.3 m band or a 1.5111 band (for example, 1.51 ⁇ m) with low transmission line loss.
- a wavelength within the band of the erbium-doped fiber may be used. The wavelength may be 1.48 m, which is the same as the wavelength of the excitation light source.
- the monitoring optical signal sent from the upstream side includes a control signal for the optical circuit 125, and this control signal can control an optical switch, an optical amplifier, a regenerative repeater, and the like included in the optical circuit. .
- the optical signal for monitoring light transmitted to the downstream side may include a control signal for the downstream cross-connect device.
- FIGS. 14 to 18 show examples of optical circuits applicable to the optical cross-connect device shown in FIG.
- the optical circuit 1255-1 shown in FIG. 14 is an optical matrix switch having a (m w + m r ) xn configuration.
- the optical circuit 1 255-1 switches the WDM signal collectively.
- the control of the controller 1 24 failure
- the optical circuit 125-1 switches the transmission line from the working fiber where the error occurred to the normal recovery fiber, and recovery from the failure can be realized.
- the optical switch used for the optical circuit may be a blocking type or a non-blocking type.
- the number of inputs and outputs of the optical circuit are the same or different. It does not matter. Further, in the above example, a unidirectional WDM signal is used, but a single wavelength signal or a bidirectional signal may be used.
- the optical circuit 1 25-1 ′ shown in FIG. 15 is an optical matrix switch having an n ′ x (m w ′ + m r ′) configuration.
- the optical circuit 125- switches the WDM signal collectively. For example, if m w 'working fibers and m r ' recovery fibers are connected to the output end of the optical circuit 1 25—, when the optical fiber or optical cable breaks, the controller 124 controls However, the optical circuit 125-1-1 'switches the transmission line from the working fiber in which the fault occurred to the normal recovery fiber, thereby realizing recovery from the fault.
- the optical switch used for the optical circuit may be a blocking type or a non-blocking type. Further, the number of inputs and the number of outputs of the optical circuit may be the same or different. Further, in the above example, a unidirectional WDM signal is used, but a single wavelength signal or a bidirectional signal may be used.
- An optical circuit 1 25—2-1 shown in FIG. 16 includes a wavelength separation circuit 201, an optical switch 1 2 3 having a (m + — + mn ) X (m + mn ,) configuration, And a wavelength multiplexing circuit 202.
- the optical circuit 125-2-1 demultiplexes the input WDM signal into wavelengths, switches for each individual wavelength, and wavelength-multiplexes and outputs. It has the function of setting individual wavelength routes.
- the wavelength division of the WDM signal is shared by a plurality of wavelength division multiplexers 201 and 202, however, one wavelength division circuit 201 and one wavelength division circuit 202 can also be used. good.
- the optical switch 123 is controlled by the controller 124 shown in FIG.
- the optical switch used for the optical circuit may be a blocking type or a non-blocking type. Also, the number of inputs and the number of outputs of the optical circuit may be the same or different. Further, in the above-described example, a unidirectional WDM signal is used, but a single wavelength signal or a bidirectional signal may be used.
- the optical circuit 1 25-2-2 shown in Fig. 17 is an improvement of the optical circuit 1 25-2-1 shown in Fig. 16 and is applicable to long-distance optical fiber transmission. . Therefore, the wavelength separation circuit 2. ⁇ and ⁇ ! ⁇ +... +! ! ! ⁇ ! ! !
- a regenerative repeater 205 or an individual wavelength optical amplifier 204 is inserted between the optical switch 123 having the configuration or between the optical switch 123 and the wavelength multiplexing circuit 202.
- a WDM signal optical amplifier 203 is inserted before the wavelength separation circuit 201 or after the wavelength multiplexing circuit 202.
- the output wavelength of the regenerative repeater 205 may be variable or fixed. Also, it may be the same as or different from the input wavelength.
- the output power of the optical amplifiers 203 and 204 is controlled according to the change of the bit rate of the optical signal.
- the optical switch 123, the regenerative repeater 205, and the optical amplifiers 203, 204 can be controlled by the controller 124 shown in FIG.
- the optical switch used for the optical circuit may be a blocking type or a non-blocking type. Also, the number of inputs and the number of outputs of the optical circuit may be the same or different. Further, in the above-described example, a unidirectional WDM signal is used, but a single wavelength signal or a bidirectional signal may be used.
- FIG. 18 shows another embodiment of the optical circuit.
- the optical circuit 1 2 5—3—1 is a combination of the optical circuit 125—1, the optical circuit 1 25—2 (—1 or 1 2), and the optical circuit 1 25—1 ′.
- switching of the WDM signal unit is performed in the optical circuit 125-1 and then the optical circuit 125-2-1 or 125-2-2.
- the switching of individual wavelength units is performed at, and the switching of WDM signal units is performed at the optical circuit 125- 1 ′, and the transmission is performed.
- the functions of the optical circuit 125-1, the optical circuit 125-2, and the optical circuit 125-1 ' can be realized at the same time. In other words, recovery from failures such as optical fiber disconnection and optical cable disconnection, and recovery in wavelength units Route setting can be realized.
- optical circuit 125-3-1 The operation of the optical circuit 125-3-1 can be controlled by the controller shown in FIG.
- FIG. 19 is a diagram illustrating another example of a bidirectional optical cross-connect device configured using the optical repeater according to the embodiment of the present invention described above.
- the monitoring optical signal transceivers 1 26 1 1-: 1 26-n, 1 26- 1 ' ⁇ : L 26 6-n' are derived from the optical signal input from the optical fiber.
- the wavelength of the optical signal for monitoring is separated and extracted, and the optical signal for monitoring is wavelength-multiplexed and inserted into the optical signal sent to the optical fiber.
- FIG. 20 and FIG. 21 are diagrams showing the configuration of the monitoring optical signal transceivers 126, 126 ′.
- the signal from the optical fiber passes through the wavelength multiplexing / demultiplexing device 127, and the monitoring optical signal is separated by the optical repeater 122.
- the monitoring optical signal is converted to a monitoring electrical signal and sent to the controller 124.
- the signal from the optical switch passes through the wavelength division multiplexer 127 and multiplexes the monitoring optical signal obtained by converting the monitoring electrical signal from the controller 124 by the optical repeater 122. And sends it to an optical fiber.
- FIGS. 22 and 23 a configuration in which the wavelength division multiplexer 127 is omitted from FIGS. 20 and 21 is also possible. In this case, as is clear from FIGS. 22 and 23, the order of the optical repeaters 1 2 1 — 1 ', 1 2 2-1 * and 1 2 1 — 2', 1 2 2-2 'is The reverse is also acceptable.
- the wavelengths of the light sources included in the optical repeaters 1 2 2 are I s and S s ′ outside the erbium-doped fiber band, and the 1.3 m band and 1.5 m band (for example, 1.5 The wavelength may be 1 ⁇ , the wavelength in the band of the erbium-doped fiber, or the 1.48 m wavelength, which is the same as the wavelength of the pump light source.
- reference numeral 125 denotes an optical circuit including an optical switch, and other reference numerals are the same as those in FIG.
- the monitoring optical signal sent from the upstream side includes a control signal for the optical circuit 125, and the control signal can control an optical switch, an optical amplifier, a regenerative repeater, and the like included in the optical circuit. .
- the optical signal for monitoring light transmitted to the downstream side may include a control signal for the downstream cross-connect device.
- the example of the optical circuit applicable to the optical cross-connect device shown in FIG. 19 may be any of the optical circuits shown in FIGS. 14 to 16 because of the reversibility of light. It is obvious. An example of this is shown in FIG. 24 which is an example of an optical circuit using the one-way optical circuit shown in FIG. 18 in both directions.
- the optical circuit 1 2 5—3—2 is composed of an optical circuit 1 2—5—1 This is a configuration that combines With this configuration, the WDM signal input is switched in WDM signal units by the optical circuit 125-1, and then the optical circuit 1255-2-1 or 1255-2-2 To switch individual wavelengths, and finally switch to the WDM signal unit in the optical circuit 125-1-1 'and send out.
- the functions of the optical circuit 125-1, the optical circuit 125-2, and the optical circuit 125-1 ′ can be realized at the same time. In other words, it is possible to recover from a failure such as an optical fiber break or an optical cable break and to set a route in wavelength units.
- the operation of the optical circuit 125-4-2 can be controlled by the controller shown in FIG.
- the optical switch used for each optical circuit may be a blocking type or a non-blocking type. Also, the number of inputs and the number of outputs of each optical circuit may be the same or different.
- optical circuit 1 2 5—3—2 is given a symbol, but the optical circuit 1 25—3—2 is basically the same as the optical circuit 1 25—3—1 shown in FIG. Are identical. This means that the optical circuits shown in FIGS. 14 to 16 can be used in both directions.
- FIG. 25 is a diagram for explaining still another example of the optical cross-connect device configured using the optical transmission device according to the embodiment of the present invention described above.
- 13 1—1 to 13 1—n are data transmitters
- 13 2—1 to: I 32—n are data receivers
- 13 3— 1 to: L 3 3—n are data receivers
- 134-1 to: I34-n is an optical transmission device
- 135 is an optical switch
- 136 is a controller.
- the example of the optical cross-connect device shown in FIG. 25 is an optical cross-connect device in which the optical transmission device, the data transmitter, and the data receiver according to each of the above-described embodiments of the present invention are built in the optical cross-connect device.
- an optical switch 135 having the same function as that described with reference to FIG. 12, a plurality of data transmitters 13 1—1 to 13 1—n connected to a plurality of input terminals thereof, and data Receivers 1 3 2—1 to 1 32—n and a plurality of optical transmission devices 1 3 3—1 to 1 33—n, 1 34— connected to a plurality of output terminals :! 1134-n, and a controller 136 that controls the entire system.
- the plurality of optical transmission devices 133-1- 1 to 133-n connected to the output terminal of the optical switch 1335 are used as optical transmission devices for transmitting data optical signals and monitoring optical signals.
- One of the optical transmission devices described with reference to FIGS. 1 to 4 and 8 is used.
- the plurality of optical transmission devices 134-1 to 134-n connected to the output terminal of the optical switch 135 are used as optical transmission devices for receiving data optical signals and monitoring optical signals.
- the optical repeater having the configuration excluding the optical transmission device 91 described with reference to FIGS. 9 and 10 is used.
- the data transmitters 13 1 1 to 1: I 3 1 n and the data receivers 13 32 1 to 13 2 n are directly connected and used as repeaters. You can do it.
- Figure 25 shows the data transmitter 1 3 1—n and the data receiver 1 3 2—n Are indicated by broken lines.
- the optical transmission devices 1 3 3-1 to 1 3 3-n may be replaced by the optical transmission devices 1 2 2-to 1 2 2-n 'shown in FIG. 1 3 4-1 to 1 3 4-n may be replaced with the optical transmission devices 1 2 1-1 ′ to 1 2 1-n ′ shown in FIG.
- the data transmitter and the data receiver may have different transmission bit rates.
- the controller 136 can control the output power level and gain of the optical transmission device according to the transmission bit rate.
- the optical cross-connect device configured as described above can control an optical switch, a large number of optical transmission devices, a data transmitter, and a data receiver included in the optical cross-connect device by one controller.
- one light source can be used as both a light source for excitation and a light source for monitoring information required by the optical transmission device, and this light source can be shared by many optical transmission devices, making the device compact and inexpensive. Can be configured.
- the optical signal for data is described as a signal of one wavelength, but the optical signal for data may be a wavelength multiplexed signal.
- the optical cross-connect device shown in FIGS. 12, 13, 19, and 25 is an optical network in which a plurality of node devices are connected to each other by optical fibers. Very suitable for use in constructing node devices. Various specific configurations of the node device using the optical cross-connect device are already known.
- FIG. 26 is an optical network constituted by the optical repeater according to the embodiment of the present invention described above and a node device constituted by using the optical cross-connect device constituted by using the optical repeater. It is a figure showing the example of a network.
- N1 to N5 are node devices.
- the optical network shown in FIG. 26 is configured by connecting a plurality of node devices N1 to N5 in a mesh pattern with each other by a plurality of optical fibers for transmitting signals in both directions. .
- Signal transmission by optical fiber can be performed up to about 70 km without installing a relay amplifier in the middle of the optical fiber, but if the distance between the node devices is longer than that, the optical relay amplifier can be used. Need.
- the optical repeater amplifier indicated by a mark is appropriately provided in the middle of the optical fiber.
- Each of the node devices N1 to N5 installed in the network includes the optical cross-connect device described with reference to FIGS. 12, 13, 19, and 25. Be composed.
- one of the optical transmission devices described with reference to FIGS. 1 to 4 and FIGS. 8 to 10 can be used as an optical repeater amplifier provided in the middle of an optical fiber as a transmission line. It is also possible to use the optical repeater described with reference to FIGS. 9 and 10 excluding the optical transmission device 91.
- an optical repeater described in the middle of an optical fiber as a transmission line an optical repeater described in US Pat. No. 5,500,756 can be used.
- the optical repeater amplifier the optical transmission device described with reference to FIG. 6 can be used, in which one set of optical fibers for transmitting signals in the reverse direction is set as one set.
- the network described above can be implemented by using the optical transmission device according to each embodiment of the present invention, an optical repeater including the optical transmission device, and an optical cross-connect device using the optical repeater. Can be constructed at low cost.
- each data optical signal may have one wavelength, or a wavelength multiplexed signal. It may be.
- a light source for exciting a doped fiber and a light source for monitoring information in an optical transmission device can be shared by one excitation and monitoring light source, and
- the structure of the optical repeater including And can be.
- the optical switch contained therein and a large number of optical transmission devices can be controlled by one controller.
- one light source is also used as a light source for monitoring information, and this light source can be used also by a large number of optical transmission devices, the device can be made compact and inexpensive.
- an optical network is configured by using an optical transmission device according to the present invention and a node device including an optical cross-connect device using the optical transmission device according to the present invention. The whole can be constructed at low cost.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP98904371A EP0964487B1 (en) | 1997-02-25 | 1998-02-18 | Optical cross connection device |
DE69839961T DE69839961D1 (de) | 1997-02-25 | 1998-02-18 | Optische querverbindungsvorrichtung |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP4099997 | 1997-02-25 | ||
JP9/40999 | 1997-02-25 |
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WO1998038709A1 true WO1998038709A1 (fr) | 1998-09-03 |
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PCT/JP1998/000670 WO1998038709A1 (fr) | 1997-02-25 | 1998-02-18 | Emetteur optique, repeteur optique et dispositif d'interconnexion optique |
Country Status (4)
Country | Link |
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US (3) | US6424445B1 (ja) |
EP (1) | EP0964487B1 (ja) |
DE (1) | DE69839961D1 (ja) |
WO (1) | WO1998038709A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002044024A (ja) * | 2000-05-30 | 2002-02-08 | Nortel Networks Ltd | フォトニック・ネットワーク・ノード |
JP2006324684A (ja) * | 2006-07-21 | 2006-11-30 | Hitachi Ltd | 光増幅器および光伝送装置 |
WO2010109810A1 (ja) * | 2009-03-26 | 2010-09-30 | 日本電気株式会社 | 光アンプ装置とその制御方法、光伝送システム |
WO2023135737A1 (ja) * | 2022-01-14 | 2023-07-20 | 日本電信電話株式会社 | 光通信装置及び光通信方法 |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19909565A1 (de) * | 1999-03-04 | 2000-10-05 | Siemens Ag | Verfahren zur Überwachung des Betriebes von optischen Fasern |
US6771905B1 (en) * | 1999-06-07 | 2004-08-03 | Corvis Corporation | Optical transmission systems including optical switching devices, control apparatuses, and methods |
US6862380B2 (en) | 2000-02-04 | 2005-03-01 | At&T Corp. | Transparent optical switch |
US6804464B2 (en) * | 2000-11-01 | 2004-10-12 | Dowslake Microsystems Corporation | Flexible and low cost wavelength management for optical networking |
EP1271825A1 (en) * | 2001-06-25 | 2003-01-02 | Lucent Technologies Inc. | Method and system for multiplexed optical information transport |
JP4647147B2 (ja) * | 2001-07-16 | 2011-03-09 | 富士通株式会社 | ラマン増幅を用いた光伝送方法および光伝送システム |
JP3976602B2 (ja) * | 2002-03-28 | 2007-09-19 | 富士通株式会社 | 光クロスコネクト装置 |
US7394981B2 (en) | 2002-03-28 | 2008-07-01 | Manifold Robert H | Optical communication management systems |
US7394806B2 (en) | 2002-04-11 | 2008-07-01 | Nortel Networks Limited | Distributed space-time-space switch |
US6922501B2 (en) * | 2002-04-11 | 2005-07-26 | Nortel Networks Limited | Fast optical switch |
EP1511331B1 (en) * | 2002-06-06 | 2012-07-04 | Fujitsu Limited | Controller for switching wavelength-division multiplex optical signal |
JP2006514505A (ja) * | 2003-06-30 | 2006-04-27 | 富士通株式会社 | 光ファイバ通信システムにおける光再生器 |
US20050008010A1 (en) * | 2003-07-10 | 2005-01-13 | Interactic Holdings, Llc | Self-regulating interconnect structure |
JP4484565B2 (ja) * | 2004-03-30 | 2010-06-16 | 富士通株式会社 | チルト補償機能を有する多段光増幅器 |
US7193839B2 (en) * | 2004-04-13 | 2007-03-20 | James Scott Hacsi | Methods of storing and retrieving electric energy |
US6975790B1 (en) * | 2005-01-10 | 2005-12-13 | Tyco Telecommunications (Us) Inc. | Apparatus for forming a WDM signal having orthogonally polarized optical channels |
US20070014514A1 (en) * | 2005-06-23 | 2007-01-18 | Viscore Technologies Inc. | Optical component |
US7440172B2 (en) * | 2005-06-23 | 2008-10-21 | Viscore Technologies Inc. | Optical amplifier |
JP4730145B2 (ja) * | 2006-03-08 | 2011-07-20 | 株式会社日立製作所 | 光信号切替え装置および光信号切替え方法 |
US8121478B2 (en) * | 2009-03-20 | 2012-02-21 | International Business Machines Corporation | Method and apparatus for implementing non-blocking computer interconnection network using bidirectional optical switch |
JP6312927B2 (ja) * | 2014-05-14 | 2018-04-18 | ▲華▼▲為▼▲海▼洋▲網▼▲絡▼有限公司 | 光中継器及び光ファイバー通信システム |
US10805034B2 (en) * | 2018-02-22 | 2020-10-13 | Nokia Solutions And Networks Oy | Protection of channel connections in an optical network |
US10880019B1 (en) | 2018-12-20 | 2020-12-29 | Acacia Communications, Inc | Impairment generation |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0387727A (ja) * | 1989-08-31 | 1991-04-12 | Fujitsu Ltd | 光ファイバ増幅器を備えた光通信方式 |
JPH04273624A (ja) * | 1990-11-15 | 1992-09-29 | Alcatel Nv | 光ファイバ増幅器を備えた光通信システム |
JPH0774746A (ja) * | 1993-08-31 | 1995-03-17 | Fujitsu Ltd | 制御部異常検出方法 |
JPH0927975A (ja) * | 1995-07-12 | 1997-01-28 | Nippon Telegr & Teleph Corp <Ntt> | 光クロスコネクト装置 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ATE107825T1 (de) * | 1989-09-29 | 1994-07-15 | Siemens Ag | Lichtwellenleiter-telekommunikationssystem mit einem oder mehreren im lwl-weg liegenden optischen schalter(n). |
US5500756A (en) | 1992-02-28 | 1996-03-19 | Hitachi, Ltd. | Optical fiber transmission system and supervision method of the same |
JPH05292040A (ja) * | 1992-04-08 | 1993-11-05 | Hitachi Ltd | 光伝送システムの構築方法 |
JP2928046B2 (ja) * | 1993-04-16 | 1999-07-28 | 日本電気株式会社 | 光ネットワ−ク及びその障害回復方式 |
GB2280560B (en) * | 1993-07-31 | 1997-09-03 | Northern Telecom Ltd | Communications system |
JP3376144B2 (ja) * | 1994-12-28 | 2003-02-10 | 日本電気株式会社 | 光ネットワーク装置及び光伝送方式 |
AU6525796A (en) * | 1995-07-18 | 1997-02-18 | British Telecommunications Public Limited Company | Optical communications system |
JP3309036B2 (ja) * | 1995-07-28 | 2002-07-29 | 松下電送システム株式会社 | カラー画像読取装置 |
CA2164071C (en) * | 1995-09-06 | 2001-08-21 | Thomas P. J. Flanagan | Optical communication system |
US6208444B1 (en) * | 1996-10-29 | 2001-03-27 | Chorum Technologies Inc. | Apparatus for wavelength demultiplexing using a multi-cavity etalon |
US5867289A (en) * | 1996-12-24 | 1999-02-02 | International Business Machines Corporation | Fault detection for all-optical add-drop multiplexer |
US6046833A (en) * | 1997-02-10 | 2000-04-04 | Optical Networks, Inc. | Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks |
US5986783A (en) * | 1997-02-10 | 1999-11-16 | Optical Networks, Inc. | Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks |
US5878177A (en) * | 1997-03-31 | 1999-03-02 | At&T Corp. | Layered switch architectures for high-capacity optical transport networks |
US6069719A (en) * | 1997-07-30 | 2000-05-30 | Ciena Corporation | Dynamically reconfigurable optical add-drop multiplexers for WDM optical communication systems |
US5959749A (en) * | 1998-05-20 | 1999-09-28 | Nortel Networks Corporation | Optical add/drop multiplexer/demultiplexer |
-
1998
- 1998-02-18 DE DE69839961T patent/DE69839961D1/de not_active Expired - Lifetime
- 1998-02-18 WO PCT/JP1998/000670 patent/WO1998038709A1/ja active IP Right Grant
- 1998-02-18 EP EP98904371A patent/EP0964487B1/en not_active Expired - Lifetime
- 1998-02-18 US US09/025,331 patent/US6424445B1/en not_active Expired - Fee Related
-
2002
- 2002-06-14 US US10/172,811 patent/US6731874B2/en not_active Expired - Fee Related
-
2004
- 2004-03-22 US US10/806,705 patent/US7194205B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0387727A (ja) * | 1989-08-31 | 1991-04-12 | Fujitsu Ltd | 光ファイバ増幅器を備えた光通信方式 |
JPH04273624A (ja) * | 1990-11-15 | 1992-09-29 | Alcatel Nv | 光ファイバ増幅器を備えた光通信システム |
JPH0774746A (ja) * | 1993-08-31 | 1995-03-17 | Fujitsu Ltd | 制御部異常検出方法 |
JPH0927975A (ja) * | 1995-07-12 | 1997-01-28 | Nippon Telegr & Teleph Corp <Ntt> | 光クロスコネクト装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP0964487A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002044024A (ja) * | 2000-05-30 | 2002-02-08 | Nortel Networks Ltd | フォトニック・ネットワーク・ノード |
JP4545349B2 (ja) * | 2000-05-30 | 2010-09-15 | ノーテル・ネットワークス・リミテッド | フォトニック・ネットワーク・ノード |
JP2006324684A (ja) * | 2006-07-21 | 2006-11-30 | Hitachi Ltd | 光増幅器および光伝送装置 |
JP4648263B2 (ja) * | 2006-07-21 | 2011-03-09 | 株式会社日立製作所 | 光増幅器および光伝送装置 |
WO2010109810A1 (ja) * | 2009-03-26 | 2010-09-30 | 日本電気株式会社 | 光アンプ装置とその制御方法、光伝送システム |
JP2010232341A (ja) * | 2009-03-26 | 2010-10-14 | Nec Corp | 光アンプ装置とその制御方法、光伝送システム |
WO2023135737A1 (ja) * | 2022-01-14 | 2023-07-20 | 日本電信電話株式会社 | 光通信装置及び光通信方法 |
Also Published As
Publication number | Publication date |
---|---|
US20020176142A1 (en) | 2002-11-28 |
US7194205B2 (en) | 2007-03-20 |
DE69839961D1 (de) | 2008-10-16 |
EP0964487B1 (en) | 2008-09-03 |
US6424445B1 (en) | 2002-07-23 |
EP0964487A1 (en) | 1999-12-15 |
EP0964487A4 (en) | 2005-10-19 |
US6731874B2 (en) | 2004-05-04 |
US20040179839A1 (en) | 2004-09-16 |
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