Optical signal relay apparatus and optical signal relay method

Abstract

To provide a wavelength conversion apparatus and a wavelength conversion method capable of suitably performing wavelength conversion in accordance with channel information of an optical signal.SOLUTION: Reception means receives a first optical signal of a first wavelength included in a wavelength-multiplexed signal to convert the received first optical signal into an electric signal. Transmission means transmits a second optical signal obtained by modulating transmission light of a second wavelength based on the electric signal. Channel information acquisition means acquires channel information of the first optical signal. Control means determines, based on the channel information, a reception parameter that the reception means applies to the reception of the first optical signal and a transmission parameter that the transmission means applies to the transmission of the second optical signal, applies the determined reception parameter to the reception means, and applies the determined transmission parameter to the transmission means.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to an optical signal relay device and an optical signal relay method. [Background technology]

[0002] In a wavelength division multiplexing (WDM) optical network system, a system has been proposed in which one or more optical signal relay devices are provided between optical transmission devices that transmit and receive optical signals, and the transmission path of the optical signal is flexibly switched. In this case, a technology is known in which the wavelength of the optical signal is converted in the optical signal relay device in order to efficiently utilize wavelength resources.

[0003] As a configuration for converting the wavelength of an optical signal in an optical signal relay device, for example, a wavelength converter that converts an optical input signal into an electrical signal and converts the electrical signal into an optical output signal is proposed in Patent Document 1. In this wavelength converter, the optical output signal is converted so as to become a signal with a different wavelength from the optical input signal.

[0004] In a typical WDM optical network system provided with an optical signal repeater having such a wavelength converter, the optical signal repeater and the like are set up after previously grasping information about the optical signal transmitted throughout the entire system. For example, in the optical signal repeater, reception parameters used in the reception process of an optical input signal and transmission parameters used in the transmission process of an optical output signal are suitably set based on the information about the optical signal. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Special Publication No. 2017-511036 Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, in WDM optical network systems, there is a demand for short-term spot demand in response to the progress of open cabling and diversification of vendors, which requires short-term usage on a wavelength-by-wavelength basis.

[0007] In response to such demand, for example, it is assumed that wavelength users prepare transceivers and connect to a WDM optical network system. In this case, the users set the bandwidth and signal format of the optical signal according to their applications. In this case, the administrator of the WDM optical network system cannot know the bandwidth and signal format of the optical signal set by the users.

[0008] In wavelength conversion of an optical signal in an optical signal repeater, the parameters applied to receive and transmit the optical signal may differ depending on the bandwidth and signal format of the optical signal. Therefore, it is necessary to know the bandwidth and signal format of the optical signal to be converted and to provide the optical signal repeater with parameters that can realize suitable wavelength conversion.

[0009] However, in a typical WDM optical network system, if the bandwidth and signal format of the optical signal set by the user cannot be known, it is fundamentally difficult to provide the optical signal relay device with parameters that will enable suitable wavelength conversion. [Means for solving the problem]

[0010] An optical signal relay device according to one embodiment of the present disclosure comprises a receiving means for receiving a first optical signal of a first wavelength included in a wavelength multiplexed signal and converting it into an electrical signal, a transmitting means for transmitting a second optical signal obtained by modulating transmitted light of a second wavelength based on the electrical signal, a channel information acquiring means for acquiring channel information of the first optical signal, and a control means for determining, based on the channel information, receiving parameters to be applied by the receiving means to receiving the first optical signal and transmitting parameters to be applied by the transmitting means to transmitting the second optical signal, applying the determined receiving parameters to the receiving means, and applying the determined transmitting parameters to the transmitting means.

[0011] An optical signal relay method that is one aspect of the present disclosure includes converting a first optical signal of a first wavelength included in a wavelength multiplexed signal into an electrical signal, outputting a second optical signal obtained by modulating transmitted light of a second wavelength based on the electrical signal, acquiring channel information of the first optical signal, determining receiving parameters to be applied to receiving the first optical signal and transmitting parameters to be applied by a transmitting means to transmitting the second optical signal based on the channel information, applying the determined receiving parameters to receiving the first optical signal, and applying the determined transmitting parameters to transmitting the second optical signal. Effect of the Invention

[0012] According to the present disclosure, it is possible to provide a wavelength conversion device and a wavelength conversion method that can perform wavelength conversion appropriately in accordance with channel information of an optical signal. [Brief description of the drawings]

[0013] [Figure 1] 1 is a block diagram illustrating a schematic configuration of an optical signal relay device according to an embodiment; [Diagram 2] 2 is a block diagram showing in more detail the configuration of an optical signal relay device according to an embodiment; FIG. [Diagram 3] FIG. 2 illustrates a first example of acquiring the bandwidth of an optical input signal. [Figure 4] FIG. 13 illustrates a second example of acquiring the bandwidth of an optical input signal. [Diagram 5] 11A and 11B are diagrams illustrating an example of acquiring a signal format of an optical input signal. [Figure 6] 11 is a flowchart of a setting operation of reception parameters and transmission parameters in an optical signal relay device according to an embodiment; [Figure 7] FIG. 11 is a diagram illustrating an example of parameter setting information. [Figure 8] 1 is a block diagram illustrating a schematic configuration of an optical signal relay device according to an embodiment; [Figure 9] 5 is a sequence diagram of a spectrum measurement operation in an optical signal repeater according to an embodiment; FIG. [Figure 10] FIG. 2 is a diagram illustrating a transmission band of a wavelength selective switch. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same elements are given the same reference numerals, and duplicated explanations will be omitted as necessary.

[0015] In the following, when referring to one embodiment, this means that the present invention is applicable to any one of the embodiments described below or a combination of two or more embodiments, and that the application is not limited to a specific embodiment.

[0016] First embodiment An optical signal repeater according to a first embodiment will be described. Fig. 1 is a block diagram showing a schematic configuration of an optical signal repeater according to an embodiment. An optical signal repeater 100 includes an optical wavelength conversion device 1, a channel information acquisition unit 2, and a control unit 3.

[0017] In the optical signal repeater 100, an optical input signal IN with a wavelength λ1 is branched into two by an optical branching unit such as an optical coupler, one of which is input to a channel information acquisition unit 2 and the other to the optical wavelength conversion device 1. The power of the optical input signal IN output to the channel information acquisition unit 2 may be a relatively small power that is sufficient to acquire channel information of the optical input signal IN. In other words, most of the optical input signal IN may be output to the optical wavelength conversion device 1.

[0018] The optical wavelength converter 1 converts an optical input signal IN of wavelength λ1 into an optical output signal OUT of wavelength λ2. As shown in the figure, the optical wavelength converter 1 has a coherent receiver front-end 11 and a coherent transmitter front-end 12. The coherent receiver front-end 11 converts the optical input signal IN of wavelength λ1 into a data signal D, which is an electrical signal, based on a reception parameter P1 provided by the control unit 3. The coherent transmitter front-end 12 converts the data signal D into an optical output signal OUT of wavelength λ2 based on a transmission parameter P2 provided by the control unit 3.

[0019] Hereinafter, the wavelength λ1 is also referred to as the first wavelength, the wavelength λ2 is also referred to as the second wavelength, the optical input signal IN is also referred to as the first optical signal, and the optical output signal OUT is also referred to as the second optical signal.

[0020] The coherent receiving front-end is an example of an optical signal receiving section or receiving means, and may have other configurations as appropriate depending on the signal format of the optical input signal IN, etc. The coherent transmitting front-end is an example of an optical signal transmitting section or transmitting means, and may have other configurations as appropriate depending on the signal format of the optical output signal OUT, etc.

[0021] The channel information acquisition unit 2 refers to the input optical input signal IN, and acquires the bandwidth and signal format of the optical input signal IN as channel information INF. The channel information acquisition unit 2 outputs the acquired channel information INF to the control unit 3.

[0022] The control unit 3 determines the reception parameters P1 and the transmission parameters P2 based on the channel information INF acquired by the channel information acquisition unit 2. The control unit 3 outputs the determined reception parameters P1 to the coherent reception front end 11 and the determined transmission parameters P2 to the coherent reception front end 12. The signal is output to a coherent transmission front end 12 .

[0023] The configuration of optical signal repeater 100 will be described in more detail. Fig. 2 is a block diagram showing the configuration of an optical signal repeater according to an embodiment in more detail. In Fig. 2, optical signal repeater 100 further includes a wavelength selective switch 4 and an optical coupler 5.

[0024] The wavelength selective switch 4 selectively selects the wavelength multiplexed optical signal L input to the optical signal repeater 100. IN The wavelength of the optical signal that the wavelength selective switch 4 transmits is controlled by a control signal C1 output by the control unit 3. In the figure, the wavelength selective switch is also referred to as a WSS (Wavelength Selective Switch).

[0025] An optical branching unit such as a one-input, two-output optical coupler 5 is inserted between the output of the wavelength selective switch 4 and the input of the optical wavelength conversion device 1. The optical coupler 5 branches the optical input signal IN into two, and outputs one to the optical wavelength conversion device 1 and the other to the channel information acquisition unit 2.

[0026] The optical wavelength conversion device 1 further includes a compensation unit 13, a local light source 14, and a transmission light source 15. The coherent receiver front end 11 includes a coherent receiver 111. The coherent transmitter front end 12 includes a driver amplifier 121, a bias control circuit 122, and a modulator 123.

[0027] The local light source 14 outputs a local light LO having a wavelength of λ1 to the coherent receiver 111 in response to a control signal C2 from the control unit 3. The transmission light source 15 outputs a transmission light L having a wavelength of λ2 to the modulator 123 in response to a control signal C4 from the control unit 3.

[0028] The coherent receiver 111 converts the optical input signal IN into a data signal D by coherently detecting the optical input signal IN using a local light LO. At this time, the coherent receiver 111 adjusts the voltage of the data signal D to be output based on a reception parameter P1. When the optical input signal IN is a dual polarization-binary phase shift keying (DP-BPSK) optical signal, the coherent receiver 111 may be configured as an integrated coherent receiver including, for example, a polarization separator, a 90° hybrid, an optical-electrical converter, and an amplifier.

[0029] The compensation unit 13 performs compensation processing on the data signal D, and outputs the compensated data signal D to the driver amplifier 121. At this time, the compensation processing performed by the compensation unit 13 may be analog processing or digital processing.

[0030] The driver amplifier 121 amplifies the data signal based on the transmission parameter P2, and outputs the amplified data signal D to the modulator 123. At this time, the driver amplifier 121 adjusts the voltage of the data signal D to be output based on the transmission parameter P2.

[0031] The bias control circuit 122 applies a bias voltage V to the modulator 123 in response to a control signal C3 from the control unit 3.

[0032] The modulator 123 may be configured as, for example, a quadrature modulator that quadrature-modulates light based on an input signal. The modulator 123 modulates the transmission light L in response to a data signal D, and outputs an optical output signal OUT.

[0033] Next, the acquisition of the bandwidth from among the channel information in the channel information acquisition unit 2 will be described first. FIG. 3 is a diagram showing a first example of the acquisition of the bandwidth of the optical input signal. As shown by the solid line in FIG. 3, the actual spectrum of the optical input signal IN is continuous data, and its bandwidth is 32 GHz. However, the frequency resolution of the channel information acquisition unit 2 is limited. In this example, the resolution of the spectrum measurement of the channel information acquisition unit 2 is 5 GHz. Therefore, the spectrum of the optical input signal IN measured by the channel information acquisition unit 2 is measured as discrete data, and is measured as a bar graph-shaped spectrum as shown in FIG. 3.

[0034] The channel information acquisition unit 2 may acquire, for example, the width of a flat portion of a spectrum peak acquired as discrete data as the bandwidth. In the example of Fig. 3, the channel information acquisition unit 2 has a spectral resolution of 5 GHz and determines that the bandwidth of the optical input signal IN is 30 GHz or more and 40 GHz or less.

[0035] Fig. 4 is a diagram showing a second example of acquiring the bandwidth of an optical input signal. In Fig. 4, the bandwidth is narrower than that in Fig. 3. In the example of Fig. 4, the channel information acquiring unit 2 determines that the bandwidth of the optical input signal IN is 10 GHz or more and 20 GHz or less.

[0036] Next, acquisition of the signal format of the optical input signal IN will be described. The channel information acquisition unit 2 determines the signal format based on the shape of the spectrum of the measured optical input signal IN. More specifically, the channel information acquisition unit 2 compares the measured spectrum of the optical input signal IN with a reference spectrum indicating the spectral shape of each signal format, and determines the signal format according to the degree of approximation of the spectral shapes. At this time, the channel information acquisition unit 2 may use any appropriate method when evaluating the degree of approximation between the spectrum of the optical input signal IN and the reference spectrum.

[0037] The channel information acquisition unit 2 outputs to the control unit 3 the channel information INF indicating the bandwidth and signal format of the optical input signal IN acquired as described above.

[0038] Fig. 5 is a diagram showing an example of acquiring the signal format of an optical input signal. In this example, when focusing on the region near the peak of the spectrum of the optical input signal IN acquired as discrete data, the value in the center is slightly smaller than the values ​​at both ends. This spectrum is compared with three reference spectra of BPSK, QPSK (Quadrature Phase Shift Keying), and 16QAM (Quadrature Amplitude Modulation), which are shown on the right side of Fig. 5. In this example, the spectrum of the optical input signal IN is closest to the reference spectrum of QPSK, so the channel information acquiring unit 2 determines that the signal format of the optical input signal IN is QPSK.

[0039] The reference spectrum may be held in advance by the channel information acquiring unit 2. Also, the reference spectrum may be stored in various storage means (not shown) provided in the optical signal repeater 100. In this case, the channel information acquiring unit 2 may read the reference spectrum from the storage means as necessary. The reference spectrum may be provided to the channel information acquiring unit 2 or the storage means as appropriate via any communication means.

[0040] Next, a description will be given of an operation of setting reception parameters and transmission parameters in optical signal repeater 100. Fig. 6 is a flowchart of an operation of setting reception parameters and transmission parameters in an optical signal repeater according to an embodiment.

[0041] Step S11 As described above, the channel information acquisition unit 2 acquires the bandwidth of the optical input signal IN.

[0042] Step S12 As described above, the channel information acquisition unit 2 acquires the signal format of the optical input signal IN.

[0043] Step S13 The channel information acquisition unit 2 outputs to the control unit 3 channel information INF indicating the bandwidth and signal format of the acquired optical input signal IN.

[0044] Step S14 The control unit 3 checks the bandwidth and signal format of the optical input signal IN indicated by the channel information INF against the parameter setting information, and then obtains reception parameters and transmission parameters suitable for the bandwidth and signal format of the optical input signal IN.

[0045] 7 is a diagram showing an example of the parameter setting information. In this case, the parameter setting information may be provided as table information showing the correspondence between the bandwidth and signal format of the optical signal and the reception parameters and transmission parameters. This allows the control unit 3 to appropriately read the reception parameters and transmission parameters corresponding to the bandwidth and signal format of the optical input signal IN.

[0046] The parameter setting information may be held in advance by the control unit 3. Also, the parameter setting information may be stored in various storage means (not shown) provided in the optical signal repeater 100. In this case, the control unit 3 may read the parameter setting information from the storage means as necessary. The parameter setting information may be provided to the control unit 3 and the storage means as appropriate via any communication means.

[0047] Step S15 The control unit 3 outputs the acquired reception parameter P1 and transmission parameter P2 to the coherent receiver 111 and the driver amplifier 121, respectively. This allows the coherent receiver 111 to perform a suitable reception process according to the bandwidth and signal format of the optical input signal IN. Also, the driver amplifier 121 can perform a suitable transmission process according to the bandwidth and signal format of the optical input signal IN and the optical output signal OUT.

[0048] As described above, optical signal repeater 100 can suitably set control information used in optical wavelength conversion in optical wavelength converter 1 based on the bandwidth and signal format of optical input signal IN. As a result, even if a user of the WDM optical network system sets the bandwidth and signal format of an optical signal according to an application, optical signal repeater 100 can achieve suitable optical wavelength conversion according to the set bandwidth and signal format.

[0049] Embodiment 2 In the first embodiment, the channel information acquisition unit 2 capable of acquiring the spectrum of the optical input signal IN alone has been described as the channel information acquisition means for acquiring the channel information of the optical input signal IN. However, the channel information acquisition means may have other configurations. In the present embodiment, a configuration will be described in which an optical power measurement unit is provided instead of the channel information acquisition unit 2, and the channel information is acquired by the channel information acquisition means composed of the optical power measurement unit and a control unit. Also, in this configuration, the spectrum of the optical input signal IN is acquired by performing optical power measurement processing multiple times using the optical power measurement unit and the control unit.

[0050] 8 is a block diagram showing a schematic configuration of an optical signal repeater according to an embodiment. Optical signal repeater 200 has a configuration in which channel information acquisition unit 2 and control unit 3 of optical signal repeater 100 are replaced with an optical power measurement unit 6 and control unit 7, respectively.

[0051] The optical power measuring unit 6 measures the optical power of the optical input signal IN branched off from the control unit 7 by the optical coupler 5. Then, the optical power measuring unit 6 outputs the measured value MP to the control unit 7.

[0052] The control unit 7 controls the transmission wavelength of the wavelength selective switch 4, and also acquires the spectrum of the optical input signal IN by receiving the measurement result of the optical power measurement unit 6. Similarly to the channel information acquisition unit 2 of the optical signal repeater 100, the control unit 7 acquires channel information based on the spectrum of the optical input signal IN.

[0053] Other configurations of optical signal repeater 200 are similar to those of optical signal repeater 100, so duplicated explanations will be omitted.

[0054] Next, a description will be given of a spectrum measurement operation in optical signal repeater 200. Fig. 9 is a sequence diagram of a spectrum measurement operation in an optical signal repeater according to an embodiment.

[0055] Step S1 In the initial state of spectrum measurement, the control unit 7 is in a standby state until the optical input signal IN is input to the optical power measuring unit 6 .

[0056] Step S2 In the initial state of spectrum measurement, the wavelength selective switch 4 is in a state where it transmits the entire band of the input optical signal. This may be realized by the control unit 7 giving an instruction to the wavelength selective switch 4 in advance by the control signal C1.

[0057] In the following, the optical power of the optical input signal IN is measured and recorded while switching the transmission band of the wavelength selective switch 4. Here, the transmission band of the wavelength selective switch 4 will be explained. FIG. 10 is a diagram showing the transmission band of the wavelength selective switch. In this embodiment, the entire band of the optical input signal IN is divided into n bands W1 to Wn, which are 2 or more, each having a predetermined bandwidth. The optical signal repeater 200 measures and records the optical power of the optical input signal IN for each of the bands W1 to Wn.

[0058] Step SA1 First, the control unit 7 instructs the wavelength selective switch 4 by a control signal C1 so that the transmission band of the wavelength selective switch 4 becomes the band W1.

[0059] Step SB1 The wavelength selective switch 4 sets the transmission band to band W1 in response to the control signal C1.

[0060] Step SC1 The optical power measuring unit 6 measures the optical power of the optical input signal IN that has passed through the wavelength selective switch 4. Then, the optical power measuring unit 6 notifies the control unit 7 of the measured optical power value MP.

[0061] Step SD1 The control unit 7 records the measured optical power value MP notified by the optical power measurement unit 6. At this time, the control unit 7 may be stored in various storage means (not shown) provided in the optical signal repeater 100. The control unit 7 may record the measured optical power value MP at any timing and read out the recorded measured optical power value MP.

[0062] Steps SA2~SAn, SB2~SBn, SC2~SCn, SD2~SDn Thereafter, while switching the transmission band of the wavelength selective switch 4, the optical power of the optical input signal IN transmitted through the wavelength selective switch 4 is repeatedly measured and recorded. In this way, the optical signal repeater 200 can set the transmission band of the wavelength selective switch 4, and measure and record the optical power of the optical input signal IN transmitted through the wavelength selective switch 4 for each of the bands W1 to Wn.

[0063] Step S4 After setting the transmission band of the wavelength selective switch 4 for all bands W1 to Wn and measuring and recording the optical power of the optical input signal IN that has passed through the wavelength selective switch 4, the control unit 7 reads out the measurement results and obtains the spectrum of the optical input signal IN as a bar graph of the optical power of the bands W1 to Wn.

[0064] Step S5 After acquiring the spectrum, the control unit 7 instructs the wavelength selective switch 4 by a control signal C1 so that the wavelength selective switch 4 transmits the entire band of the input optical signal.

[0065] Step S6 The wavelength selective switch 4 sets the transmission band to the entire band in response to the control signal C1.

[0066] The spectrum measurement operation has been described above, but other operations of optical signal repeater 200 are the same as those of optical signal repeater 100, except that channel information is acquired by control unit 7 instead of channel information acquisition unit 2. Therefore, overlapping explanations of operations will be omitted.

[0067] As described above, according to optical signal repeater 200, the spectrum of optical input signal IN can be acquired using the measured value of optical power by optical power measuring unit 6. Optical power measuring unit 6 is generally provided in optical signal repeaters to measure the optical power of an input optical signal. Therefore, by performing the above-mentioned spectrum measurement operation, even in a general optical signal repeater, it is possible to realize spectrum measurement of optical input signal IN without requiring any particular change in configuration. As a result, in optical signal repeater 200 having the configuration of a general optical signal repeater, similarly to optical signal repeater 100, it is possible to suitably set control information used in optical wavelength conversion in optical wavelength converter 1 based on the bandwidth and signal format of optical input signal IN.

[0068] Other embodiments Although the present disclosure has been described above with reference to the embodiments, the present disclosure is not limited to the above-mentioned embodiments. Various modifications that can be understood by a person skilled in the art can be made to the configuration and details of the present disclosure within the scope of the present disclosure. Furthermore, each embodiment can be appropriately combined with other embodiments.

[0069] For example, in the optical signal repeater 200, the control unit 7 has been described as acquiring the channel information. Therefore, the reference spectrum may be held in advance by the control unit 7. The reference spectrum may also be stored in various storage means (not shown) provided in the optical signal repeater 200. In this case, the control unit 7 may read the reference spectrum from the storage means as necessary. The reference spectrum may be provided to the control unit 7 and the storage means as appropriate via any communication means.

[0070] The channel information acquisition unit 2 may have any configuration capable of acquiring channel information from the spectrum of input light, for example.

[0071] As the optical power measuring unit 6, any optical power measuring means such as a photodiode may be used.

[0072] In the above embodiment, BPSK, QPSK, and 16QAM are given as examples of signal formats, but these are merely examples and the signal format of the optical input signal IN may be any other signal format.

[0073] Each drawing is merely an example for describing one or more embodiments. Each drawing may relate not only to one particular embodiment, but to one or more other embodiments. As can be understood by those skilled in the art, various features or steps described with reference to any one drawing may be combined with features or steps shown in one or more other drawings to create an embodiment not explicitly shown or described, for example. Not all features or steps shown in any one drawing are necessary to describe an exemplary embodiment, and some features or steps may be omitted. The order of steps described in any drawing may be changed as appropriate.

[0074] A part or all of the above-described embodiments can be described as, but is not limited to, the following supplementary notes.

[0075] (Supplementary Note 1) An optical signal relay device comprising: receiving means for receiving a first optical signal of a first wavelength included in a wavelength multiplexed signal and converting it into an electrical signal; transmitting means for transmitting a second optical signal obtained by modulating transmitted light of a second wavelength based on the electrical signal; channel information acquiring means for acquiring channel information of the first optical signal; and control means for determining, based on the channel information, receiving parameters to be applied by the receiving means to receiving the first optical signal and transmitting parameters to be applied by the transmitting means to transmitting the second optical signal, applying the determined receiving parameters to the receiving means, and applying the determined transmitting parameters to the transmitting means.

[0076] (Supplementary Note 2) The optical signal repeater described in Supplementary Note 1, wherein the channel information acquisition means measures the spectrum of the first optical signal, acquires a bandwidth and a signal format of the first optical signal as the channel information based on the measured spectrum, and outputs the acquired channel information to the control means.

[0077] (Supplementary Note 3) An optical signal repeater as described in Supplementary Note 1, further comprising: a wavelength selection means for transmitting an optical signal of a band specified by the control means from the wavelength multiplexed signal; and the channel information acquisition means is composed of the control means and an optical power measurement means for measuring the optical power of the optical signal transmitted through the wavelength selection means and outputting the measurement result to the control means, wherein the control means switches the band transmitted by the wavelength selection means among a plurality of bands narrower than the band of the first optical signal, while the optical power measurement means measures the optical power of the optical signal transmitted through the wavelength selection means, thereby measuring the spectrum of the first optical signal in the plurality of bands, and the control means acquires the bandwidth and signal format of the first optical signal as the channel information based on the measured spectrum.

[0078] (Supplementary Note 4) The optical signal repeater device according to Supplementary Note 2 or 3, wherein the channel information acquisition means compares the measured spectrum with a plurality of reference spectra indicating standards for the spectra of optical signals of a plurality of signal formats, and acquires the signal format corresponding to the reference spectrum that is closest to the measured spectrum as the signal format of the first optical signal.

[0079] (Additional Note 5) The control unit refers to information indicating a correspondence relationship between a bandwidth and a signal format of the optical signal and a reception parameter and a transmission parameter, and identifies the reception parameter and the transmission parameter corresponding to the bandwidth and the signal format of the first optical signal. 5. An optical signal relay device according to claim 2.

[0080] (Supplementary Note 6) The optical signal relay device according to any one of Supplementary Note 1 to 5 or 2, wherein the receiving means is configured as a coherent optical receiving front-end means, and the transmitting means is configured as a coherent optical transmitting front-end means.

[0081] (Supplementary Note 7) The optical signal relay device according to Supplementary Note 6, wherein the coherent optical receiving front-end means adjusts a voltage of the electrical signal in accordance with the transmission parameters.

[0082] (Supplementary Note 8) The optical signal relay device described in Supplementary Note 6, wherein the coherent optical transmission front-end means comprises: an amplifier means for amplifying the electrical signal based on the transmission parameters; and a modulator means for modulating the transmission light based on the amplified electrical signal to output the second optical signal.

[0083] (Supplementary Note 9) The optical signal relay device according to any one of Supplementary Notes 1 to 8, further comprising a compensation unit that compensates for the electrical signal output by the receiving unit and outputs the compensated electrical signal to the transmitting unit.

[0084] (Supplementary Note 10) An optical signal relay method comprising: converting a first optical signal of a first wavelength included in a wavelength multiplexed signal into an electrical signal; outputting a second optical signal obtained by modulating transmitted light of a second wavelength based on the electrical signal; acquiring channel information of the first optical signal; determining, based on the channel information, receiving parameters to be applied to receiving the first optical signal and transmitting parameters to be applied by a transmitting means to transmitting the second optical signal; applying the determined receiving parameters to receiving the first optical signal; and applying the determined transmitting parameters to transmitting the second optical signal. [Explanation of symbols]

[0085] 1. Optical Wavelength Conversion Device 2. Channel information acquisition section 3, 7 Control section 4 Wavelength selective switch 5 Optical Coupler 6 Optical power measurement section 11 Coherent receiving front end 12 Coherent Transmit Front End 13 Compensation Department 14 Local light source 15 Transmitting light source 100 Optical signal repeater 111 Integrated Coherent Receiver 121 Driver Amplifier 122 Bias control circuit 123 Modulator 200 Optical signal repeater D Data Signal IN Optical input signal L light LO Local Light OUT Optical output signal

Claims

1. a receiving means for receiving a first optical signal having a first wavelength included in the wavelength multiplexed signal and converting the first optical signal into an electrical signal; a transmitting means for transmitting a second optical signal obtained by modulating a transmission light having a second wavelength based on the electrical signal; a channel information acquiring means for acquiring channel information of the first optical signal; a control means for determining reception parameters to be applied by the receiving means to receiving the first optical signal and transmission parameters to be applied by the transmitting means to transmitting the second optical signal based on the channel information, applying the determined reception parameters to the receiving means, and applying the determined transmission parameters to the transmitting means. Optical signal repeater.

2. The channel information acquisition means measuring a spectrum of the first optical signal; acquiring, as the channel information, a bandwidth and a signal format of the first optical signal based on the measured spectrum; outputting the acquired channel information to the control means; 2. The optical signal relay device according to claim 1.

3. a wavelength selection unit that transmits an optical signal having a wavelength band designated by the control unit from the wavelength multiplexed signal; The channel information acquisition means The control means; an optical power measuring means for measuring the optical power of an optical signal transmitted through the wavelength selecting means and outputting the measurement result to the control means; the control means measures the spectrum of the first optical signal in the plurality of bands by switching the band transmitted by the wavelength selection means among a plurality of bands narrower than the band of the first optical signal, and the optical power measurement means measures the optical power of the optical signal transmitted through the wavelength selection means; the control means acquires, as the channel information, a bandwidth and a signal format of the first optical signal based on the measured spectrum; 2. The optical signal relay device according to claim 1.

4. The channel information acquisition means comparing the measured spectrum with a plurality of reference spectra indicative of a standard for spectra of optical signals in a plurality of signal formats; acquiring a signal format corresponding to the reference spectrum that is most similar to the measured spectrum as a signal format of the first optical signal; 4. An optical signal relay device according to claim 2 or 3.

5. the control means refers to information indicating a correspondence relationship between a bandwidth and a signal format of an optical signal and a reception parameter and a transmission parameter, and identifies the reception parameter and the transmission parameter corresponding to the bandwidth and the signal format of the first optical signal; 4. An optical signal relay device according to claim 2 or 3.

6. The receiving means is configured as a coherent optical receiving front-end means, The transmitting means is configured as a coherent optical transmitting front-end means.

3. An optical signal relay device according to claim 1 or 2.

7. the coherent optical receiver front-end means adjusts the voltage of the electrical signal in response to the transmission parameters; 7. An optical signal relay device according to claim 6.

8. The coherent optical transmission front-end means comprises: an amplifier for amplifying the electrical signal based on the transmission parameters; a modulation means for modulating the transmission light based on the amplified electrical signal to output the second optical signal.

7. An optical signal relay device according to claim 6.

9. a compensating means for compensating the electrical signal output by the receiving means and outputting the compensated electrical signal to the transmitting means, 3. An optical signal relay device according to claim 1 or 2.

10. converting a first optical signal having a first wavelength included in the wavelength multiplexed signal into an electrical signal; outputting a second optical signal obtained by modulating a transmission light having a second wavelength based on the electrical signal; Obtaining channel information of the first optical signal; determining, based on the channel information, reception parameters to be applied to the reception of the first optical signal and transmission parameters to be applied to the transmission of the second optical signal by a transmitting means; applying the determined receive parameters to receive the first optical signal and applying the determined transmit parameters to transmit the second optical signal. Optical signal relay method.

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