JP2006197489A - Optical wavelength multiplexing system, optical terminating device and optical network unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To set and adjust a reception wavelength, a transmission wavelength and a transmission power of a newly installed ONU by a control from OLT when newly connecting the ONU in the optical wavelength multiplexing system using an optical power splitter or a wavelength combiner/splitter. <P>SOLUTION: The OLT in the optical wavelength multiplexing system comprises control signal transmission means which multiplexes a control signal including a wavelength setting information of a downward signal optical wavelength and an upward signal optical wavelength that are set to the newly installed ONU with a downward signal light of each wavelength corresponding to each ONU and transmits it. The newly installed ONU comprises control signal reception means which receives a control signal that is multiplexed with the downward signal light of an arbitrary wavelength out of the downward signal lights of each wavelength corresponding to each ONU and sets the downward signal optical wavelength and the upward signal optical wavelength according to this control signal. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to an optical wavelength division multiplexing system that performs bidirectional optical communication between an optical transceiver (center side) and a plurality of optical transceivers (user side). The present invention also relates to an optical termination device and an optical network unit used in the optical wavelength multiplexing system of the present invention.
The optical transmission / reception device (center side) is called, for example, an optical termination device (OLT), and the optical transmission / reception device (user side) is called, for example, an optical network unit (ONU), and will be described below as OLT and ONU.

  FIG. 22 shows a first configuration example of a conventional optical wavelength multiplexing system (Patent Document 1). In the figure, ONUs 60-1 to 60-n corresponding to OLT 50 and users 1 to n (n is an integer of 2 or more) are set to 1: n via optical fiber transmission line 71 and optical power splitter (optical coupler) 72. It is connected.

  The OLT 50 includes a plurality of optical transmitters 51-1 to 51-n and a wavelength multiplexer 52. Each of the optical transmitters 51-1 to 51-n outputs downlink signal lights having different wavelengths. The wavelength multiplexer 52 wavelength-multiplexes the downlink signal light transmitted from each optical transmitter, and sends it to the optical fiber transmission line 71 as wavelength multiplexed signal light. The wavelength multiplexed signal light is n-branched by the optical power splitter 72 and transmitted to each ONU 60. The ONU 60-k of the user k includes a wavelength selection filter 61 and an optical receiver 62. The wavelength selection filter 61 selects the downlink signal light having the wavelength assigned to the ONU 60-k of the user k from the wavelength multiplexed signal light. The optical receiver 62 performs a receiving process of the wavelength-selected downlink signal light. The other ONUs also receive the downstream signal light having the assigned wavelength.

  Although there is no description regarding upstream signal light in Patent Document 1, if each ONU 60 transmits upstream signal light having a different wavelength, each upstream signal light is wavelength-multiplexed by the optical power splitter 72 and reaches the OLT 50. To do. In the OLT 50, the upstream signal light from each wavelength-multiplexed ONU is wavelength-multiplexed and demultiplexed, and each optical receiver performs reception processing, thereby enabling bidirectional communication between the OLT and each ONU.

  FIG. 23 shows a second configuration example of a conventional optical wavelength multiplexing system (Patent Document 2). In the figure, the OLT 50 and the wavelength multiplexer / demultiplexer 73 are connected via optical fiber transmission lines 71-1 and 71-2 in multiple sections, and the wavelength multiplexer / demultiplexer 73 and users 1 to n (n is an integer of 2 or more). Are connected via optical fiber transmission lines 71-3 and 71-4 in the access section, respectively. Here, one wavelength band D is allocated for the downstream signal from the OLT to the ONU, one wavelength band U (≠ D) is allocated for the upstream signal from the ONU to the OLT, and the wavelengths λd1 to λdn of the wavelength band D are further allocated. And an example in which the wavelengths λu1 to λun of the wavelength band U are assigned to the respective ONUs.

  The optical transmitter 53 of the OLT 50 wavelength-multiplexes the downstream optical signal in the wavelength band D (wavelengths λd1 to λdn) and the upstream optical carrier in the wavelength band U (wavelengths λu1 to λun), and passes through the optical fiber transmission line 71-1. To the wavelength multiplexer / demultiplexer 73. The wavelength multiplexer / demultiplexer 73 demultiplexes the downstream optical signal in the wavelength band D and the upstream optical carrier in the wavelength band U into the respective wavelengths, and downstream optical signals in the wavelengths λd1 to λdn and upstream light in the wavelengths λu1 to λun. Each pair of carriers is transmitted to the corresponding ONU 60-1 to 60-n via the optical fiber transmission line 71-3.

  The ONU 60-1 demultiplexes the transmitted downstream optical signal having the wavelength λd1 and the upstream optical carrier having the wavelength λu1 by the WDM coupler 63, receives the downstream optical signal having the wavelength λd1 by the optical receiver 64, and receives the wavelength λu1. The upstream optical carrier is modulated by the optical modulator (M) 65 and transmitted as an upstream optical signal to the wavelength multiplexer / demultiplexer 73 via the optical fiber transmission line 71-4. The same applies to other ONUs. The upstream optical signals of wavelengths λu1 to λun transmitted from each ONU are wavelength multiplexed by the wavelength multiplexer / demultiplexer 73, transmitted to the OLT 50 via the upstream optical fiber transmission line 71-2, and received by the optical receiver 54. The

  Here, the wavelength band D (wavelength λd1 to λdn) of the downstream optical signal and the wavelength band U (wavelength λu1 to λun) of the upstream optical signal (upstream optical carrier) are on the wavelength axis as shown in FIG. Arranged so as not to overlap. When an arrayed waveguide grating (AWG) is used as the wavelength multiplexer / demultiplexer 73, a function of demultiplexing a downstream signal wavelength (for example, λd1) and an upstream signal wavelength (for example, λu1) at an FSR (free spectrum range) interval to the same port Have In each ONU, since the downstream optical signal and the upstream optical carrier that are demultiplexed one by one from the wavelength band D and the wavelength band U are input in pairs, the wavelength band D and the wavelength band U are set as shown in FIG. By using the WDM coupler 63 having the same specifications to be separated, it is possible to separate the downstream optical signal and the upstream optical carrier so as not to cause interference with each other.

By the way, such a device is aimed at the common use (small product variety) of the components of the ONUs 60-1 to 60-n. That is, by first supplying an upstream optical carrier of each wavelength from the OLT 50 to each ONU, each ONU does not need to be provided with a light source of each assigned wavelength, and the optical modulator 65 in the wavelength band U of the same specification. Can respond. Furthermore, in each ONU, in order to demultiplex the downstream optical signal and the upstream optical carrier, it is possible to cope with the WDM coupler 63 having the same specification that separates the wavelength band D and the wavelength band U.
Japanese Patent Publication No. 3-44701 JP 2000-196536 A

  By the way, in an optical wavelength multiplexing system in which a plurality of ONUs are connected to one OLT via an optical power splitter, the reception wavelength and transmission wavelength of each ONU are determined in advance. Therefore, when a new ONU is added, it is necessary to set the corresponding reception wavelength and transmission wavelength at the point where the ONU is connected.

  Further, in an optical wavelength multiplexing system in which a plurality of ONUs are connected to one OLT via a wavelength multiplexer / demultiplexer, the reception wavelength and transmission wavelength of each ONU are determined according to the point where they are connected. Therefore, when a new ONU is added, it is necessary to set the corresponding reception wavelength and transmission wavelength at the point where the ONU is connected.

  Furthermore, in an optical wavelength division multiplexing system in which a plurality of ONUs are connected to one OLT via an optical power splitter or wavelength multiplexer / demultiplexer, the optical loss corresponding to each ONU varies between the plurality of ONUs. is there. For this reason, even if all ONUs transmit with substantially the same power, there is a variation in the light receiving power of the OLT, and there is a problem that crosstalk occurs between upstream signal light corresponding to each ONU.

  In an optical wavelength multiplexing system using an optical power splitter or wavelength multiplexer / demultiplexer, the present invention sets and sets the reception wavelength, transmission wavelength and transmission power of a new ONU by control from the OLT when an ONU is newly connected. An object of the present invention is to provide an optical wavelength division multiplexing system, an optical termination device and an optical network unit that can be adjusted.

  The OLT of the optical wavelength multiplexing system using the optical power splitter of the present invention transmits a control signal including the wavelength setting information of the downstream optical signal wavelength and the upstream optical signal wavelength to be set in the newly installed ONU to each wavelength corresponding to each ONU. Control signal transmission means for multiplexing and transmitting the downstream signal light is provided. The new ONU receives a control signal multiplexed with a downstream signal light of an arbitrary wavelength among the downstream signal light of each wavelength corresponding to each ONU, and the downstream signal light wavelength and the upstream signal light wavelength according to the control signal And a control signal receiving means for setting.

  The OLT of the optical wavelength multiplexing system using the optical power splitter of the present invention is a predetermined signal corresponding to the ONU to be newly installed, including the control signal including the wavelength setting information of the downstream signal light wavelength and the upstream signal light wavelength to be set in the newly installed ONU. Control signal transmission means for multiplexing and transmitting the downlink signal light having the wavelength is provided. The newly installed ONU receives the control signal multiplexed with the downlink signal light having a predetermined wavelength while switching the wavelengths corresponding to each ONU, and sets the downlink signal light wavelength and the uplink signal light wavelength according to the control signal. Control signal receiving means is provided.

  The OLT of the optical wavelength multiplexing system using the optical power splitter of the present invention provides a control signal including the wavelength setting information of the downstream signal light wavelength and the upstream signal light wavelength to be set in the newly installed ONU, and a predetermined signal not set in each ONU. Control signal transmitting means for transmitting as a downstream signal light having a wavelength is provided. The new ONU receives a control signal from a downstream signal light having a predetermined wavelength while switching each wavelength corresponding to each ONU, and sets a downstream signal light wavelength and an upstream signal light wavelength according to the control signal Is provided.

  The OLT of the optical wavelength division multiplexing system using the wavelength multiplexer / demultiplexer according to the present invention is configured so that the control signal including the wavelength setting information of the downstream signal light wavelength and the upstream signal light wavelength set in the newly installed ONU corresponds to each ONU. Control signal transmission means for multiplexing and transmitting the downlink signal light having the wavelength is provided. The new ONU includes a control signal receiving unit that receives a control signal multiplexed with a downlink signal light having a predetermined wavelength cut out by the wavelength multiplexer / demultiplexer, and sets an uplink signal light wavelength according to the control signal. .

  The OLT of the optical wavelength multiplexing system using the wavelength multiplexer / demultiplexer according to the present invention corresponds to the ONU to newly install the control signal including the wavelength setting information of the downstream signal light wavelength and the upstream signal light wavelength to be set in the newly installed ONU. Control signal transmission means for multiplexing and transmitting the downlink signal light having a predetermined wavelength is provided. The new ONU includes a control signal receiving unit that receives a control signal multiplexed with a downstream signal light having a predetermined wavelength and sets an upstream signal light wavelength in accordance with the control signal.

  The OLT of the optical wavelength multiplexing system using the wavelength multiplexer / demultiplexer according to the present invention transmits a control signal including the downstream signal light wavelength to be set in the newly installed ONU and the wavelength setting information of the upstream signal light wavelength to the downstream corresponding to each ONU. Control signal transmitting means for transmitting as a broadband downstream signal light separated from the wavelength band of the signal light by the periodicity of the wavelength multiplexer / demultiplexer is provided. The new ONU includes a control signal receiving means for receiving a control signal from a downstream signal light having a wavelength cut out from a broadband downstream signal light by a wavelength multiplexer / demultiplexer, and setting an upstream signal light wavelength according to the control signal. .

  In an optical wavelength multiplexing system in which a plurality of ONUs are connected to one OLT via an optical power splitter or wavelength multiplexer / demultiplexer, when the ONU is newly connected, the reception wavelength, transmission wavelength, and The transmission power can be set and adjusted by control from the OLT. As a result, it is not necessary to set the reception wavelength and the transmission wavelength at the connection position of the newly installed ONU, and the work efficiency at the time of new installation can be improved. Further, even when there is a variation in the optical loss corresponding to each ONU between a plurality of ONUs and the OLT, the optimum transmission power of each ONU can be adjusted by the control from the OLT. The occurrence of crosstalk between signal lights can be avoided.

(First embodiment)
FIG. 1 shows a first embodiment of the optical wavelength division multiplexing system of the present invention. In the figure, the OLT 10 and the ONU 20-k (1 ≦ k ≦ n) are connected via an optical fiber transmission line 71 and an optical power splitter (optical coupler) 72.

  The OLT 10 includes a plurality of n optical transmitters 11-1 to 11-n, a plurality of n optical receivers 12-1 to 12-n, a wavelength multiplexer / demultiplexer 13, and a plurality of control signal multiplexing units 14-1 to 14-1. 14-n, a processing unit 15 and a control signal distributor 16. Each of the optical transmitters 11-1 to 11-n and each of the optical receivers 12-1 to 12-n transmits and receives downlink signal light and uplink signal light having different wavelengths from each other with the corresponding ONU. The wavelength of the downstream signal light corresponding to each ONU is λd1 to λdn, and the wavelength of the upstream signal light is λu1 to λun. The wavelength multiplexer / demultiplexer 13 wavelength-multiplexes the downstream signal light having the wavelengths λd1 to λdn transmitted from the optical transmitters 11-1 to 11-n, and sends the wavelength multiplexed signal light to the optical fiber transmission line 71. The wavelength multiplexed signal light transmitted to the optical fiber transmission line 71 is distributed to each ONU 20-1 to 20-n via the optical power splitter 72. That is, wavelength multiplexed signal light obtained by wavelength multiplexing the downstream signal light having the wavelengths λd1 to λdn is also input to the ONU 20-k. On the other hand, the upstream signal light of the wavelengths λu1 to λun transmitted from the ONUs 20-1 to 20-n is wavelength-multiplexed by the optical power splitter 72 and input to the OLT 10. The wavelength multiplexed signal light input to the OLT 10 is separated by the wavelength multiplexer / demultiplexer 13 into upstream signal light having wavelengths λu1 to λun and received by the optical receivers 12-1 to 12-n.

  The processing unit 15 generates a control signal including the ID of the new ONU 20-k, wavelength setting information, and the like, and the control signal distributor 16 distributes the control signal to the control signal multiplexing units 14-1 to 14-n. Each control signal multiplexing means 14-1 to 14-n multiplexes the control signal with the downlink main signal transmitted to each ONU and sends it to each optical transmitter 11-1 to 11-n. Each of the optical transmitters 11-1 to 11-n generates downlink signal light having wavelengths λd1 to λdn including the main signal and the control signal, respectively. Therefore, in the newly installed ONU 20-k to which the wavelength multiplexed signal light obtained by wavelength multiplexing the downstream signal light having the wavelengths λd1 to λdn is input, the control signal can be extracted from any of the downstream signal light of each wavelength. On the other hand, each of the optical receivers 12-1 to 12-n outputs the received upstream main signal, and sends a monitor signal indicating the reception status (power, code error rate, etc.) of each upstream main signal to the processing unit 15. Send it out. Further, each of the optical transmitters 11-1 to 11-n may separate the control signal from each ONU multiplexed on each uplink main signal and send it to the processing unit 15.

  The new ONU 20-k includes a WDM filter 21, a wavelength selection filter 22, an optical receiver 23, an optical transmitter 24, a control signal separation unit 25, and a processing unit 26. The WDM filter 21 transmits downstream signal light in the wavelength band of wavelengths λd1 to λdn (wavelength multiplexed signal light) transmitted from the OLT 10 and upstream signal light in the wavelength band of wavelengths λu1 to λun including the wavelength λuk transmitted from the ONU 20-k. Are multiplexed and separated from the optical fiber transmission line 71. The wavelength selection filter 22 selects the downstream signal light having the wavelength λdk assigned to the ONU 20-k from the wavelength multiplexed signal light separated by the WDM filter 21. The optical receiver 23 performs reception processing of the wavelength-selected downlink signal light and outputs a main signal addressed to the ONU 20-k. The other ONUs also perform reception processing of downstream signal light of the assigned wavelength, and output the main signal addressed to each ONU.

  The control signal separation means 25 separates the control signal from the downlink main signal, and the processing unit 26 extracts the wavelength setting information in the ONU 20-k from this control signal, and sets the wavelength λuk in the wavelength selection filter 22 and the optical transmitter 24. Control. Further, the processing unit 26 performs setting control of the power of the optical transmitter 24. The optical transmitter 24 receives the upstream main signal, generates upstream signal light based on the set wavelength λuk and power, and transmits it to the optical fiber transmission line 71 via the WDM filter 21.

  The wavelength selection filter 22 is configured to be able to select any signal light with wavelengths λd1 to λdn. For example, a multilayer filter whose output wavelength changes depending on the input position by controlling the number of films and the film thickness can be used. Further, as the wavelength selection filter 22, a semiconductor waveguide type filter whose output wavelength changes through a change in refractive index due to temperature, or a fabric whose output wavelength changes by changing the distance between two reflecting surfaces constituting the resonator. A Perot filter or the like can be used.

  The optical transmitter 24 has a configuration capable of generating arbitrary signal light with wavelengths λu1 to λun, and for example, a laser array that can select an output laser by an electric signal can be used. As the optical transmitter 24, a distributed Bragg reflection (DBR) laser capable of selecting an output wavelength by a combination of a plurality of drive currents can be used.

  Based on the above configuration, when the new ONU 20-k is connected to the optical wavelength multiplexing system, the unknown selection wavelength λdk set in the wavelength selection filter 22 and the unknown transmission wavelength λuk set in the optical transmitter 24 are recognized, A processing procedure until setting will be described.

  FIG. 2 shows an example of an ONU setting control sequence in the first embodiment. In this sequence, the wavelengths λdk and λuk are designated from the OLT 10 based on a number (ID) serving as an index for identifying the new ONU 20-k. Note that the OLT receives the ID of the newly installed ONU 20-k from an operation support system provided separately.

  The OLT 10 generates a control signal having the ID of the newly installed ONU 20-k and wavelength setting information in the processing unit 15 and inputs the control signal to the control signal multiplexing means 14-1 to 14-n via the control signal distributor 16. The signals are multiplexed and input to the optical transmitters 11-1 to 11-n, respectively, and downstream signal lights having wavelengths λλd1 to λdn are generated and transmitted (S1). Each downstream signal light is multiplexed by the wavelength multiplexer / demultiplexer 13, sent to the optical fiber transmission line 71 as wavelength multiplexed signal light, distributed by the optical power splitter 72, and transmitted to each ONU 20-1 to 20 -n. . At this time, the downlink signal light to which the control signal is multiplexed is currently being transmitted, and is multiplexed onto each main signal by a multiplexing method described later. At this time, the optical transmitter 11-k corresponding to the newly installed ONU 20-k may also start transmission of any downstream signal light obtained by multiplexing the control signals.

  Thereafter, in the OLT 10, the optical receiver 12-k corresponding to the newly installed ONU 20-k receives the upstream signal light having the wavelength λuk, and the processing unit 15 monitors the reception status (power, code error rate, etc.) (S2). .

  The new ONU 20-k receives the wavelength multiplexed signal light transmitted from the OLT 10 through the WDM filter 21, arbitrarily sets the selected wavelength of the wavelength selection filter 22, and converts the downstream signal light of the corresponding wavelength to the wavelength multiplexed signal light. And is received by the optical receiver 23. Note that the wavelength selected by the wavelength selection filter 22 can be received in any one of the downstream signal lights currently being transmitted, for example, by sequentially changing in a predetermined order from λd1 to λdn. Here, the control signal multiplexed in the received downstream signal light is separated by the control signal separation means 25 and received by the processing unit 26 (S3). The processing unit 26 analyzes the control signal, sets the wavelength λuk corresponding to the wavelength setting information in the optical transmitter 24, and sets the transmission power of the optical transmitter 24 to an initial value (S4). The optical transmitter 24 starts transmission of an arbitrary upstream signal light with the set wavelength λuk and transmission power (S5). At this time, the upstream signal light may be any continuous light or repetitive pattern.

  The processing unit 15 of the OLT 10 monitors the reception status (power, code error rate, etc.) of the upstream signal light of the wavelength λuk detected by the optical receiver 12-k, and confirms the wavelength λuk of the upstream signal light and the transmission power In step S6, the transmission power is gradually increased while the reception status of the upstream signal light is fed back to the newly installed ONU 20-k. Note that the new ONU 20-k may automatically gradually increase the transmission power until there is an OK notification from the OLT 10. When the setting to the predetermined transmission power without interference with other signals is completed, the OLT 10 and the newly installed ONU 20-k perform a transmission / reception test of the main signal using the wavelength λdk of the downstream signal light and the wavelength λuk of the upstream signal light. (S7), transmission / reception of the main signal is started (S8).

  In the present embodiment, since the OLT 10 multiplex-transmits the same control signal with all of the downlink signal light being transmitted, the control signal will not be lost even if the selected wavelength of the wavelength selection filter 22 of the newly installed ONU 20-k is changed. . Therefore, the selection of the wavelength λdk of the downstream signal light (setting of the wavelength selection filter 22) in the newly installed ONU 20-k is performed at an arbitrary timing before the start of the main signal transmission / reception test (before S3 to S6). That's fine.

  Further, the OLT 10 may always transmit vacant wavelength information through a control signal, and set a wavelength to be used by the new ONU 20-k based on the vacant wavelength information obtained from the control signal. At this time, if one set of upstream signal light wavelength and downstream signal light wavelength is always transmitted as the free wavelength information, the OLT 10 transmits the upstream signal light at which wavelength the ONU newly established from that point first transmits. It is only necessary to monitor the reception status of the optical receiver corresponding to the wavelength.

  Here, with reference to the ONU processing procedure shown in FIG. 3 and the OLT processing procedure shown in FIG. 4, the wavelength and transmission power setting method in the new ONU will be described in detail.

  In FIG. 3, when the newly installed ONU receives the control signal transmitted from the OLT (S11), the new ONU performs wavelength setting and transmission power setting of the optical transmitter (S12, S13). The transmission power is set to the lowest power (setting condition p = 1) determined in advance as an initial value. After transmitting an arbitrary upstream signal light under the setting condition p (S14), the system waits for a predetermined time (S15). This standby time is the time required for the OLT to receive the upstream signal light and return a control signal such as reset to the ONU according to the reception status. For example, at least about 10 microseconds in which signal light travels back and forth through an optical fiber transmission line of about 1.5 km, and considering electrical processing time and margin, it may be several milliseconds to several seconds. If there is an OK notification from the OLT after this waiting time, the transmission power is determined and the process is terminated. If there is no OK notification, the transmission power is successively increased until the power mode reaches the maximum value pmax (S16, S17, S18). ). By taking the procedure of increasing the sequential transmission power, the transmission power is not usually too high. However, if the transmission power is too high for some reason, a procedure for receiving a transmission power reduction request from the OLT and lowering the power mode may be inserted after S15 (S19, S20).

  On the other hand, if there is no OK notification from the OLT even when the power mode is raised to the upper limit, the setting is reset and the process is stopped. Alternatively, the control signal may be returned (S11), and a series of setting processes may be performed again from the beginning, or the setting may be reset and the process may be stopped when this loop is repeated a predetermined number of times. .

  Note that the wavelength selection of the downstream signal light in the newly installed ONU (setting of the wavelength selection filter wavelength selection) may be executed at an arbitrary timing in this operation flow, as in the description of the wavelength setting sequence in FIG.

  In FIG. 4, the OLT transmits a control signal and monitors the reception status (power, code error rate, etc.) of the optical receiver (upstream signal light of wavelength λuk) corresponding to the newly installed ONU (S31). The received light power is determined from the reception status of the optical receiver corresponding to the new ONU (S32), and when the received light power within the specified range is detected, an OK notification including the ID is transmitted to the new ONU and the setting process is performed. The process ends (S32, S33). If the light receiving power of the optical receiver corresponding to the newly installed ONU is less than the specified value, there is no need to make a special request when the newly installed ONU automatically increases the transmission power sequentially. Return (S32). In this case, a request for increasing the transmission power may be included in the control signal for the new ONU. On the other hand, since the new ONU will increase the transmission power successively, the transmission power will not normally be too high, but if for some reason the transmission power exceeds the specified level, the transmission power will drop to the new ONU. The request may be transmitted (S34), and the process may return to the light reception power detection / determination process after waiting for a predetermined time (S35).

  By the setting method of the new ONU described above, the new ONU can automatically set the reception wavelength and the transmission wavelength under the leadership of the OLT. Furthermore, in the newly installed ONU, the transmission power at the set transmission wavelength is gradually increased from a low level while monitoring the reception status in the OLT, so that the transmission power is too strong and crosstalk (leakage light) to other signal lights. ) It is possible to avoid a situation where noise becomes large.

  The transmission of the downstream signal light from the OLT to the newly installed ONU may be started at an arbitrary timing in the operation flow. Further, instead of the OK notification from the OLT to the new ONU, the NG notification that is always issued may be deleted.

(Control signal multiplexing method)
The control signal can be multiplexed with the main signal by time division multiplexing, frequency division multiplexing, code division multiplexing, or the like.

  FIG. 5 shows a time division multiplexing method of control signals in the first embodiment. In the figure, in the OLT control signal multiplexing means 14, the main signal and the control signal are respectively buffered, given an identifier, and transmitted so that the times do not overlap each other. In the control signal separation means 25 of the ONU, the main signal and the control signal are separated based on the identifier.

  FIG. 6 shows a frequency division multiplexing method for control signals in the first embodiment. In the figure, in the OLT control signal multiplexing means 14, the control signal is generated in advance so as not to overlap the frequency band with the main signal, and is frequency-multiplexed to the main signal by a mixer or a filter and transmitted. In the ONU control signal separation means 25, the main signal and the control signal are separated by a filter. As the modulation method of the control signal, intensity shift keying (ASK), frequency shift keying (FSK), phase shift keying (PSK) or the like can be used. In the case of the above time division multiplexing, the speed and modulation method of the main signal are limited due to the feasibility of the buffer circuit and the multiplexing circuit, but in the case of frequency division multiplexing, the main signal of an arbitrary speed and modulation method is used. can do.

  FIG. 7 shows a code division multiplexing method for control signals in the first embodiment. In the figure, in the control signal multiplexing means 14 of the OLT, the control signal is encoded by an encoding circuit such as a spread spectrum circuit, and then multiplexed with the main signal by a mixer and transmitted. As shown in the figure, the power ratio with the main signal is made sufficiently small so that the quality does not deteriorate even if the main signal is received as it is by the ONU. The control signal separation means 25 of the ONU passes the branch from the main signal, passes through a decoding circuit such as a spectrum despreading circuit, and then removes the main signal component by a high-frequency cutoff filter and extracts the control signal. In the case of the above frequency multiplexing, the OLT optical transmitter and the ONU optical receiver need to operate in the control signal band in addition to the main signal band. However, if code division multiplexing is used, only the main signal band is used. An optical transceiver that operates in response to this can be used.

(Second Embodiment)
FIG. 8 shows a configuration example of the OLT in the second embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 in this embodiment is an alternative to the OLT 10 in the first embodiment shown in FIG. 1 and is characterized in that a control signal to be transmitted to the newly installed ONU 20-k is superimposed at the optical stage. The configuration of the new ONU 20-k according to the first embodiment shown in FIG. 1 can be used as it is.

  In FIG. 8, the wavelength multiplexer 17 of the OLT 10 wavelength-multiplexes the downstream signal light having the wavelengths λd1 to λdn transmitted from the optical transmitters 11-1 to 11-n. The wavelength multiplexed signal light is input to the optical modulator 18 and is modulated by the control signal output from the processing unit 15. Thereby, the control signal is superimposed on the downstream signal light of each wavelength in a lump. The wavelength multiplexed signal light on which the control signal is superimposed is sent to the optical fiber transmission line 71 through the WDM filter 19. An optical amplifier may be used in place of the optical modulator 18, and the drive current may be modulated by a control signal. On the other hand, the upstream signal light of the wavelengths λu1 to λun transmitted from the ONUs 20-1 to 20-n is wavelength-multiplexed by the optical power splitter 72 and input to the OLT 10. The wavelength multiplexed signal light input to the OLT 10 is separated into upstream signal light of wavelengths λu1 to λun by the WDM filter 19 and the wavelength demultiplexer 17 ′ and received by the optical receivers 12-1 to 12-n.

  Between the OLT 10 of the present embodiment and the newly installed ONU 20-k of the first embodiment, the wavelength selection of the downstream signal light (setting of the selection wavelength of the wavelength selection filter) and the wavelength selection of the upstream signal light (of the optical transmitter) Wavelength setting) and transmission power adjustment can be performed according to the control procedure shown in FIGS. 2 to 4 as in the first embodiment.

  As for the control signal multiplexing method, it is difficult to apply the time division multiplexing method because it is difficult to buffer the main signal. However, the optical modulator 18 uses the frequency division multiplexing method or the code division multiplexing method. It is possible to apply. However, when the control signals are multiplexed, the power (degree of modulation) is set sufficiently low so as not to affect the main signal.

(Third embodiment)
FIG. 9 shows a configuration example of the OLT in the third embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 in this embodiment is an alternative to the OLT 10 in the first embodiment shown in FIG. 1 and is characterized in that its control signal is transmitted as downlink signal light only to the new ONU 20-k. The configuration of the new ONU 20-k according to the first embodiment shown in FIG. 1 can be used as it is.

  In FIG. 9, the processing unit 15 of the OLT 10 generates a control signal including wavelength setting information of the newly installed ONU 20-k and sends it to the optical transmitter 11-k via the control signal multiplexing unit 14-k. The optical transmitter 11-k transmits downlink signal light having a wavelength λdk including a control signal. On the other hand, the optical receiver 12-k that receives the upstream signal light transmitted from the newly installed ONU 20-k outputs the received upstream main signal and outputs a monitor signal indicating the reception status (power, code error rate, etc.). The data is sent to the processing unit 15.

  In FIG. 1, the ONU 20-k receives the wavelength multiplexed signal light transmitted from the OLT 10 via the WDM filter 21, arbitrarily sets the selection wavelength of the wavelength selection filter 22, and sets the wavelength of the downstream signal light of the corresponding wavelength. The light is separated from the multiplexed signal light and received by the optical receiver 23. Here, the processing unit 26 sequentially changes the selection wavelength of the wavelength selection filter 22 until the downstream signal light is received and the control signal included therein is received by the processing unit 26 via the control signal separation means 25. When the selected wavelength is set to λdk, the control signal included in the downstream signal light having the wavelength λdk can be received. The processing unit 26 sets the wavelength λuk corresponding to the wavelength setting information of the control signal in the optical transmitter 24 and sets the transmission power of the optical transmitter 24 to an initial value. The following processing procedure is the same as that of the first embodiment.

  FIG. 10 shows an example of the ONU setting control sequence according to the present embodiment. The difference from the example of the ONU setting control sequence according to the first embodiment shown in FIG. 2 is as follows. In S41 instead of S1, the processing unit 15 of the OLT 10 generates a control signal having the wavelength setting information of the new ONU 20-k, and inputs the control signal from the control signal multiplexing unit 14-k to the optical transmitter 11-k. Generate and transmit signal light. In S42 instead of S3, the downstream signal light of wavelength λdk is received while sequentially changing the selection wavelength of the wavelength selection filter 22 of the new ONU 20-k, and the control signal is received by the processing unit 26 via the control signal separation means 25.

  In this embodiment, as shown in FIG. 11, the control signal multiplexing means 14-1 to 14-n of the OLT 10 use switches, and the control signal separation means 25 of each ONU 20-1 to 20-n is a switch or distributor. Can be used. For the new ONU 20-k, the control signal may be transmitted and received in the setting mode and the main signal may be transmitted and received in the steady mode by switching the switches. That is, it is not necessary to multiplex the control signal to the main signal.

(Fourth embodiment)
FIG. 12 shows a configuration example of the OLT in the fourth embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 according to the present embodiment is an alternative to the OLT 10 according to the first embodiment shown in FIG. 1 and includes an optical transmitter 11-0 for control signals, and transmits the control signal to be transmitted to the new ONU 20-k. It is characterized in that it is transmitted as a downstream signal light having a wavelength λd0 from the optical device 11-0. The configuration of the new ONU 20-k according to the first embodiment shown in FIG. 1 can be used as it is.

  In FIG. 12, the wavelength multiplexer / demultiplexer 13 of the OLT 10 wavelength-multiplexes the downstream signal light having the wavelengths λd0 and λd1 to λdn transmitted from the optical transmitters 11-0 and 11-1 to 11-n. The wavelength multiplexed signal light is sent to the optical fiber transmission line 71. The processing unit 15 generates a control signal including the ID of the newly installed ONU, wavelength setting information, and the like, and sends it to the optical transmitter 11-0. The optical transmitter 11-0 transmits downlink signal light having a wavelength λd0 including a control signal. On the other hand, each of the optical receivers 12-1 to 12-n outputs the received upstream main signal, and sends a monitor signal indicating the reception status (power, code error rate, etc.) of each upstream main signal to the processing unit 15. Send it out.

  In FIG. 1, the ONU 20-k receives the wavelength multiplexed signal light transmitted from the OLT 10 through the WDM filter 21, sets the selection wavelength of the wavelength selection filter 22 to λd0, and downloads the downstream signal of the wavelength λd0 including the control signal. The light is separated from the wavelength multiplexed signal light and received by the optical receiver 23. The processing unit 26 receives the control signal via the control signal separation means 25, sets the wavelength λuk corresponding to the wavelength setting information of the control signal in the optical transmitter 24, and sets the transmission power of the optical transmitter 24 to the initial value. Set to. The following processing procedure is the same as that of the first embodiment.

  The ONU setting control sequence of this embodiment is the same as the ONU setting control sequence of the third embodiment shown in FIG. However, in S41, the processing unit 15 of the OLT 10 generates a control signal having the wavelength setting information of the new ONU 20-k, inputs it to the optical transmitter 11-0, and generates and transmits a downstream signal light having the wavelength λd0. In S42, the selection wavelength of the wavelength selection filter 22 of the newly installed ONU 20-k is set to λd0, the downstream signal light including the control signal is received, and the control signal is received by the processing unit 26 via the control signal separation means 25. Even in the case of the present embodiment, as in the third embodiment, as the control signal separation means 25 of the newly installed ONU 20-k, a switch, a divider, or a frequency separating filter is used, the control signal is received in the setting mode, and the steady mode Then, the main signal may be received.

  In addition, the setting of the wavelength λdk of the downstream signal light in the wavelength selection filter 22 of the new ONU 20-k is performed immediately after starting the transmission / reception of the main signal after the wavelength setting of the optical transmitter 24 and the setting of the transmission power are completed. The same applies to switching when a switch is used as the control signal separation means 25 of the new ONU 20-k.

(Fifth embodiment)
FIG. 13 shows a configuration example of the ONU in the fifth embodiment of the optical wavelength multiplexing system of the present invention. The ONU 20-k in this embodiment is an alternative to the ONU 20-k in the first embodiment shown in FIG. 1, and includes an optical tap 27 for branching the output of the wavelength selection filter 22 and an optical receiver dedicated to control signals. 28. The control signal separation unit 25 does not need a separation function from the main signal, and may have any configuration that can extract only the control signal. The OLT corresponding to the ONU 20-k of the present embodiment is not limited to the OLT of the first embodiment shown in FIG. 1, but the OLT of the second embodiment shown in FIG. 8, and the OLT of the third embodiment shown in FIG. The OLT of the fourth embodiment shown in FIG. 12 can be used.

(Sixth embodiment)
FIG. 14 shows a sixth embodiment of the optical wavelength multiplexing system of the present invention. In the present embodiment, the configuration of the ONU 20-k corresponding only to the OLT 10 of the fourth embodiment shown in FIG. 12 is shown, and the WDM filter 21 separates the downstream signal light including the control signal having the wavelength λd0 and receives the dedicated optical signal. The control signal received and detected by the device 28 is directly input to the processing unit 26.

  The ONU setting control sequence of this embodiment is the same as the ONU setting control sequence of the third embodiment shown in FIG. However, in S41, the processing unit 15 of the OLT 10 generates a control signal having the wavelength setting information of the new ONU 20-k, inputs it to the optical transmitter 11-0, and generates and transmits a downstream signal light having the wavelength λd0. In S42, the optical receiver 28 receives the downstream signal light including the control signal having the wavelength λd0, and the control unit 26 receives the control signal. That is, in this embodiment, since the control signal is always received, the procedure for selecting it becomes unnecessary.

(Seventh embodiment)
FIG. 15 shows a seventh embodiment of the optical wavelength multiplexing system of the present invention. In the present embodiment, an upstream optical carrier (for example, unmodulated light) used for transmission of upstream signal light is supplied from the OLT 10 to each ONU 20-1 to 20-n, and upstream optical carriers having wavelengths assigned to the respective ONUs. It is characterized by a configuration that modulates and folds back. Here, an example applied to the configuration of the first embodiment shown in FIG. 1 is shown, but the present invention can be similarly applied to the configurations of the above embodiments and the following embodiments.

  In the figure, the OLT 10 includes a multi-wavelength light source 19 that outputs multi-wavelength light with wavelengths λu1 to λun, and transmits the light to an optical fiber transmission line 71 via an optical coupler 73. In the ONU 20-k, the multi-wavelength light having the wavelengths λu 1 to λun is collectively separated by the WDM filter 21 and input to the optical transmitter 24. Here, the optical transmitter 24 includes a reflective optical modulator or an injection-locked laser (for example, a Fabry-Perot laser) 241 and a wavelength selection filter 242. The processing unit 26 sets the selection wavelength of the wavelength selection filter 242 to λuk, so that the upstream optical carrier having the wavelength λuk is separated from the multi-wavelength light and is input to the reflective optical modulator or the injection locking laser 241. The upstream signal light modulated by the signal is transmitted in the reverse direction. At this time, the transmission power is controlled according to the above procedure.

(Eighth embodiment)
FIG. 16 shows an eighth embodiment of the optical wavelength multiplexing system of the present invention. In this embodiment, in the first embodiment shown in FIG. 1, a wavelength multiplexer / demultiplexer 74 is used instead of the optical power splitter (optical coupler) 72 that connects the OLT 10 and the ONU 20-k (1 ≦ k ≦ n). Each ONU is connected to each other via a wavelength. By using the wavelength multiplexer / demultiplexer 74, the wavelength multiplexed signal light transmitted from the OLT 10 is demultiplexed into downstream signal lights of the respective wavelengths λd1 to λdn and transmitted to the corresponding ONUs 20-1 to 20-n, The upstream signal lights of wavelengths λu1 to λun transmitted from the respective ONUs 20-1 to 20-n are combined and transmitted to the OLT 10. Therefore, since only the downstream signal light having the wavelength λdk is received by the newly installed ONU 20-k, the wavelength selection filter 22 becomes unnecessary.

  FIG. 17 shows an example of the ONU setting control sequence according to the present embodiment. The difference from the example of the ONU setting control sequence according to the third embodiment shown in FIG. 10 is as follows. In S51 instead of S42, there is no wavelength selection operation in the wavelength selection filter 22 of the new ONU 20-k, and the control signal is received by the processing unit 26 via the optical receiver 23 and the control signal separation means 25. Even in the case of the present embodiment, as in the third embodiment, the control signal separation means 25 of the newly installed ONU 20-k uses a switch or a distributor or a filter for frequency separation, receives a control signal in the setting mode, and in the steady mode. The main signal may be received.

(Ninth embodiment)
FIG. 18 shows a configuration example of the OLT in the ninth embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 in the present embodiment is an alternative to the OLT 10 in the eighth embodiment shown in FIG. 16, and is characterized in that a control signal to be transmitted to the new ONU 20-k is superimposed at the optical stage. The configuration of the new ONU 20-k of the eighth embodiment shown in FIG. 16 can be used as it is. The operations of the OLT 10 and the new ONU 20-k are the same as those in the second embodiment shown in FIG.

(Tenth embodiment)
FIG. 19 shows a configuration example of the OLT in the tenth embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 in this embodiment is an alternative to the OLT 10 in the eighth embodiment shown in FIG. 16, and is characterized in that its control signal is transmitted as downlink signal light only to the new ONU 20-k. And The configuration of the new ONU 20-k of the eighth embodiment shown in FIG. 17 can be used as it is. The operation of the OLT 10 and the new ONU 20-k is the same as that of the third embodiment shown in FIG.

(Eleventh embodiment)
FIG. 20 shows a configuration example of the ONU in the eleventh embodiment of the optical wavelength multiplexing system of the present invention. The ONU 20-k in this embodiment is an alternative to the ONU 20-k in the eighth embodiment shown in FIG. 16, and includes an optical tap 27 for branching the output of the WDM filter 21 and an optical receiver 28 dedicated to control signals. It is characterized by providing. The control signal separation unit 25 does not need a separation function from the main signal, and may have any configuration that can extract only the control signal. The OLT corresponding to the ONU 20-k of the present embodiment is not limited to the OLT of the eighth embodiment shown in FIG. 16, but the OLT of the ninth embodiment shown in FIG. 18, and the OLT of the tenth embodiment shown in FIG. OLT can be used.

(Twelfth embodiment)
FIG. 21 shows a twelfth embodiment of the optical wavelength multiplexing system of the present invention. The OLT 10 in the present embodiment is an alternative to the OLT 10 in the eighth embodiment shown in FIG. 16, and includes an optical transmitter 11-0 for control signals, and transmits the control signal to be transmitted to the newly installed ONU 20-k. It is characterized in that it is transmitted as a downstream signal light having a wavelength λd0 from the optical device 11-0. Further, the ONU 20-k in this embodiment is an alternative to the ONU 20-k in the eighth embodiment shown in FIG. 16, and the WDM filter 21 separates the downstream signal light including the control signal of the wavelength λd0 and uses the dedicated ONU 20-k. A control signal received and detected by the optical receiver 28 is directly input to the processing unit 26.

  Here, the wavelength λd0 of the optical transmitter 11-0 is a wide band. The wavelength multiplexer / demultiplexer 74 demultiplexes the wavelength λdk of the downstream signal light corresponding to the newly installed ONU 20-k, and only α corresponding to the FSR of the wavelength multiplexer / demultiplexer 74 from the downstream signal light of the broadband wavelength λd0. Separate downstream λdk + α downstream signal light. Therefore, the WDM filter 21 of the new ONU 20-k receives the downstream signal light of the wavelength λdk + α to the optical receiver 28 as long as the downstream signal light of the wavelength λdk + α, the wavelength λdk and the upstream signal light of the wavelength λuk are separated. Thus, the control signal can be extracted.

  If the wavelengths λd1 to λdn of the downstream signal light and the wavelengths λu1 to λun of the upstream signal light have a relationship corresponding to the FSR of the wavelength multiplexer / demultiplexer 74, one optical fiber transmission line is bidirectionally provided. Can be used.

  The ONU setting control sequence of this embodiment is the same as the ONU setting control sequence of the eighth embodiment shown in FIG. However, in S41, the processing unit 15 of the OLT 10 generates a control signal having the wavelength setting information of the new ONU 20-k, inputs it to the optical transmitter 11-0, and generates and transmits a downstream signal light having the wavelength λd0. In S51, the optical receiver 28 receives the downstream signal light including the control signal having the wavelength λd0 + α, and the control unit 26 receives the control signal.

The figure which shows 1st Embodiment of the optical wavelength division multiplexing system of this invention. The figure which shows the ONU setting control sequence example in 1st Embodiment. The flowchart which shows the processing procedure of ONU in 1st Embodiment. 5 is a flowchart showing a processing procedure of OLT in the first embodiment. The figure explaining the time division multiplexing method of the control signal in 1st Embodiment. The figure explaining the frequency division multiplexing method of the control signal in 1st Embodiment. The figure explaining the code division multiplexing method of the control signal in 1st Embodiment. The figure which shows the structural example of OLT in 2nd Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the structural example of OLT in 3rd Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the ONU setting control sequence example in 3rd Embodiment. The figure explaining the transmission method of the control signal in 3rd Embodiment. The figure which shows the structural example of OLT in 4th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the structural example of ONU in 5th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows 6th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows 7th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows 8th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the ONU setting control sequence example in 8th Embodiment. The figure which shows the structural example of OLT in 9th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the structural example of OLT in 10th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the structural example of OLT in 11th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows 12th Embodiment of the optical wavelength multiplexing system of this invention. The figure which shows the 1st structural example of the conventional optical wavelength multiplexing system. The figure which shows the 2nd structural example of the conventional optical wavelength multiplexing system.

Explanation of symbols

10 Optical Termination Equipment (OLT)
DESCRIPTION OF SYMBOLS 11 Optical transmitter 12 Optical receiver 13 Wavelength multiplexer / demultiplexer 14 Control signal multiplexing means 15 Processing part 16 Control signal distribution part 17 Wavelength multiplexer 17 'Wavelength splitter 18 Optical modulator 19 WDM filter 20 Optical network unit ( ONU)
DESCRIPTION OF SYMBOLS 21 WDM filter 22 Wavelength selection filter 23,28 Optical receiver 24 Optical transmitter 25 Control signal separation means 26 Processing part 27 Optical tap 71 Optical fiber transmission line 72 Optical power splitter 73 Optical coupler 74 Wavelength multiplexer / demultiplexer

Claims (32)

An optical transceiver (center side) and a maximum of n optical transceivers (user side) are connected via an optical fiber transmission line and an optical power splitter, and each optical transceiver (user side) is connected to the optical transceiver (center side). ) And the downstream signal light transmitted from each optical transmission / reception device (user side) to the upstream signal light transmitted from the optical transmission / reception device (center side) so as not to overlap with each other, each optical transmission / reception device (user side) In an optical wavelength division multiplexing system that wavelength-multiplexes and transmits downlink signal light and uplink signal light of the wavelength assigned to each
The optical transmission / reception apparatus (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception apparatus (user side) to each optical transmission / reception apparatus (user side). Control signal transmission means for multiplexing and transmitting to downstream signal light of each wavelength corresponding to
The newly installed optical transmission / reception device (user side) receives the control signal multiplexed with the downstream signal light of any wavelength among the downstream signal light of each wavelength corresponding to each optical transmission / reception device (user side). An optical wavelength multiplexing system comprising control signal receiving means for setting a downstream optical signal wavelength and an upstream optical signal wavelength according to the control signal. An optical transceiver (center side) and a maximum of n optical transceivers (user side) are connected via an optical fiber transmission line and an optical power splitter, and each optical transceiver (user side) is connected to the optical transceiver (center side). ) And the downstream signal light transmitted from each optical transmission / reception device (user side) to the upstream signal light transmitted from the optical transmission / reception device (center side) so as not to overlap with each other, each optical transmission / reception device (user side) In an optical wavelength division multiplexing system that wavelength-multiplexes and transmits downlink signal light and uplink signal light of the wavelength assigned to each
The optical transmission / reception device (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception device (user side) to the newly installed optical transmission / reception device (user side). Control signal transmission means for multiplexing and transmitting to downstream signal light of a predetermined wavelength corresponding to
The newly installed optical transmission / reception device (user side) receives the control signal multiplexed on the downstream signal light of the predetermined wavelength while switching each wavelength corresponding to each optical transmission / reception device (user side). An optical wavelength multiplexing system comprising control signal receiving means for setting a downstream optical signal wavelength and an upstream optical signal wavelength in accordance with a control signal. An optical transceiver (center side) and a maximum of n optical transceivers (user side) are connected via an optical fiber transmission line and an optical power splitter, and each optical transceiver (user side) is connected to the optical transceiver (center side). ) And the downstream signal light transmitted from each optical transmission / reception device (user side) to the upstream signal light transmitted from the optical transmission / reception device (center side) so as not to overlap with each other, each optical transmission / reception device (user side) In an optical wavelength division multiplexing system that wavelength-multiplexes and transmits downlink signal light and uplink signal light of the wavelength assigned to each
The optical transmission / reception apparatus (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception apparatus (user side) to each optical transmission / reception apparatus (user side). Control signal transmission means for transmitting as a downstream signal light of a predetermined wavelength not set in
The newly installed optical transmission / reception device (user side) receives the control signal from the downstream signal light of the predetermined wavelength while switching each wavelength corresponding to each optical transmission / reception device (user side), and responds to the control signal. And a control signal receiving means for setting the downstream signal light wavelength and the upstream signal light wavelength. An optical transmitter / receiver (center side) and a maximum of a plurality of n optical transmitter / receivers (user side) are connected to each wavelength via an optical fiber transmission line and a wavelength multiplexer / demultiplexer, and each light is transmitted from the optical transmitter / receiver (center side). Each optical transmission / reception is arranged so that the wavelength bands of the downstream signal light transmitted to the transmission / reception device (user side) and the upstream signal light transmitted from each optical transmission / reception device (user side) to the optical transmission / reception device (center side) do not overlap. In an optical wavelength multiplexing system that wavelength-multiplexes and transmits downlink signal light and uplink signal light having a wavelength assigned to each device (user side),
The optical transmission / reception apparatus (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception apparatus (user side) to each optical transmission / reception apparatus (user side). Control signal transmission means for multiplexing and transmitting to downstream signal light of each wavelength corresponding to
The newly installed optical transmission / reception apparatus (user side) receives the control signal multiplexed on the downlink signal light of a predetermined wavelength cut out by the wavelength multiplexer / demultiplexer, and the uplink signal light in accordance with the control signal An optical wavelength multiplexing system comprising a control signal receiving means for setting a wavelength. An optical transmitter / receiver (center side) and a maximum of a plurality of n optical transmitter / receivers (user side) are connected to each wavelength via an optical fiber transmission line and a wavelength multiplexer / demultiplexer, and each light is transmitted from the optical transmitter / receiver (center side). Each optical transmission / reception is arranged so that the wavelength bands of the downstream signal light transmitted to the transmission / reception device (user side) and the upstream signal light transmitted from each optical transmission / reception device (user side) to the optical transmission / reception device (center side) do not overlap. In an optical wavelength multiplexing system that wavelength-multiplexes and transmits downlink signal light and uplink signal light having a wavelength assigned to each device (user side),
The optical transmission / reception device (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception device (user side) to the newly installed optical transmission / reception device (user side). Control signal transmission means for multiplexing and transmitting to downstream signal light of a predetermined wavelength corresponding to
The newly installed optical transceiver (user side) receives the control signal multiplexed on the downstream signal light of the predetermined wavelength, and has a control signal receiving means for setting the upstream signal light wavelength according to the control signal An optical wavelength division multiplexing system characterized by comprising. An optical transmission / reception device (center side) and a maximum of a plurality of n optical transmission / reception devices (user side) are connected in a wavelength-compatible manner via an optical fiber transmission line and a wavelength multiplexer / demultiplexer having periodic transmission characteristics. The wavelength bands of the downstream signal light transmitted from the center side) to each optical transceiver (user side) and the upstream signal light transmitted from each optical transceiver (user side) to the optical transceiver (center side) do not overlap. In an optical wavelength multiplexing system that arranges and wavelength-division-transmits downlink signal light and uplink signal light of wavelengths assigned to each optical transceiver (user side),
The optical transmission / reception apparatus (center side) sends a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength to be set in the newly installed optical transmission / reception apparatus (user side) to each optical transmission / reception apparatus (user side). Control signal transmitting means for transmitting as a broadband downstream signal light separated by the periodicity of the wavelength multiplexer / demultiplexer with respect to the wavelength band of downstream signal light corresponding to
The newly installed optical transmission / reception apparatus (user side) receives the control signal from the downstream signal light having a wavelength cut out from the broadband downstream signal light by the wavelength multiplexer / demultiplexer, and the upstream signal is transmitted in accordance with the control signal. An optical wavelength multiplexing system comprising control signal receiving means for setting an optical wavelength. In the optical wavelength division multiplexing system according to any one of claims 1 to 6,
The optical transmission / reception apparatus (center side) monitors the reception status of upstream signal light having a wavelength corresponding to the newly installed optical transmission / reception apparatus (user side), and newly installs the reception status by the control signal (user side). ) Provided with an upstream signal light monitoring means,
The newly installed optical transmission / reception device (user side) increases or decreases or holds the transmission power of the upstream signal light of a predetermined wavelength according to the reception status notified from the optical transmission / reception device (center side). An optical wavelength division multiplexing system characterized by comprising: The optical wavelength division multiplexing system according to claim 7,
The transmission power control means of the newly installed optical transmission / reception device (user side) has a power mode corresponding to a plurality of stages from low to high transmission power, and the transmission power is reduced or reduced from the optical transmission / reception device (center side). An optical wavelength division multiplexing system that is configured to sequentially increase the power mode at predetermined time intervals when there is no instruction corresponding to holding. The optical wavelength division multiplexing system according to claim 1 or 4,
The control signal transmitting means of the optical transmission / reception apparatus (center side) multiplexes the control signal with a main signal at an electrical stage to generate downstream signal light of each wavelength corresponding to each optical transmission / reception apparatus (user side) An optical wavelength division multiplexing system characterized by The optical wavelength division multiplexing system according to claim 2 or 5,
The control signal transmission means of the optical transmission / reception apparatus (center side) multiplexes the control signal with the main signal at the electrical stage, and generates downstream signal light of a predetermined wavelength corresponding to the newly installed optical transmission / reception apparatus (user side) An optical wavelength division multiplexing system characterized in that The optical wavelength division multiplexing system according to claim 1 or 4,
The control signal transmission means of the optical transmitter / receiver (center side) multiplexes the control signal at the optical stage with wavelength multiplexed signal light obtained by wavelength multiplexing the downstream signal light of each wavelength corresponding to each optical transmitter / receiver (user side). An optical wavelength division multiplexing system characterized in that In the optical wavelength division multiplexing system according to claim 9 or 10,
The optical wavelength multiplexing system, wherein the control signal transmission means of the optical transmission / reception apparatus (center side) is configured to add an identifier to each of the main signal and the control signal and perform time division multiplexing. The optical wavelength division multiplexing system according to any one of claims 9 to 11,
The optical wavelength multiplexing system, wherein the control signal transmission means of the optical transmission / reception apparatus (center side) is configured such that the main signal and the control signal are set in different frequency bands and frequency division multiplexed. The optical wavelength division multiplexing system according to any one of claims 9 to 11,
The optical wavelength multiplexing system, wherein the control signal transmission means of the optical transceiver (center side) is configured to code division multiplex the main signal and the control signal. In the optical wavelength division multiplexing system according to any one of claims 1, 2, 4, and 5,
The control signal receiving means of the newly installed optical transceiver (user side) receives downstream signal light including the control signal, separates the main signal and the control signal from the output electric signal, and outputs the control signal. An optical wavelength division multiplexing system characterized by having an output configuration. In the optical wavelength division multiplexing system according to any one of claims 1, 2, 4, and 5,
The control signal receiving means of the newly installed optical transmission / reception apparatus (user side) has a configuration in which the downstream signal light including the control signal is branched into two, respectively, and the control signal is extracted from one of the electrical signals. An optical wavelength division multiplexing system. The optical wavelength division multiplexing system according to claim 3 or 6,
The control signal receiving means of the newly installed optical transceiver (user side) is configured to demultiplex and receive downstream signal light having a predetermined wavelength including the control signal and extract the control signal from the electrical signal. An optical wavelength division multiplexing system. The optical wavelength division multiplexing system according to claim 2 or 5,
The control signal transmission means of the optical transmission / reception apparatus (center side) and the control signal reception means of the newly installed optical transmission / reception apparatus (user side) switch between downlink signal light including the control signal and downlink signal light including the main signal. An optical wavelength multiplexing system characterized by having a configuration for transmitting and receiving data. In the optical wavelength division multiplexing system according to any one of claims 1 to 6,
The control signal receiving means of the newly installed optical transceiver (user side) selects a wavelength for receiving the downstream signal light including the control signal when setting the wavelength, and receives a downstream signal light including the main signal when stationary. An optical wavelength division multiplexing system characterized in that the configuration is selected. In the optical wavelength division multiplexing system according to any one of claims 2 to 6,
The optical transceiver (center side) includes means for supplying an upstream optical carrier to each optical transceiver (user side),
Each of the optical transmission / reception apparatuses (user side) includes means for modulating and transmitting an uplink optical carrier having a corresponding wavelength from the uplink optical carrier. An optical termination device (OLT) and a maximum of n optical network units (ONUs) are connected via an optical fiber transmission line and an optical power splitter, and downstream signal light transmitted from the optical termination device to each optical network unit, An optical wavelength division multiplexing system that arranges the wavelength bands of upstream signal light transmitted from the optical network unit to the optical termination device so that they do not overlap, and wavelength-multiplexes downstream signal light and upstream signal light of the wavelength assigned to each optical network unit. In the optical terminator of
Control signal transmission for multiplexing and transmitting a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength set in the newly installed optical network unit to each downstream optical signal of each wavelength corresponding to each optical network unit An optical terminator for an optical wavelength division multiplexing system. In the optical network unit of the optical wavelength division multiplexing system comprising the optical termination device according to claim 21,
The control signal multiplexed with the downlink signal light of an arbitrary wavelength among the downlink signal light of each wavelength corresponding to each optical network unit is received, and the downlink signal light wavelength and the uplink signal light wavelength are determined according to the control signal. An optical network unit for an optical wavelength division multiplexing system, comprising control signal receiving means for setting. An optical termination device (OLT) and a maximum of n optical network units (ONUs) are connected via an optical fiber transmission line and an optical power splitter, and downstream signal light transmitted from the optical termination device to each optical network unit, An optical wavelength division multiplexing system that arranges the wavelength bands of upstream signal light transmitted from the optical network unit to the optical termination device so that they do not overlap, and wavelength-multiplexes downstream signal light and upstream signal light of the wavelength assigned to each optical network unit. In the optical terminator of
Control for multiplexing and transmitting a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength set in the newly installed optical network unit to a downstream optical signal having a predetermined wavelength corresponding to the newly installed optical network unit An optical terminator for an optical wavelength division multiplexing system comprising a signal transmission means. An optical network unit of an optical wavelength division multiplexing system comprising the optical termination device according to claim 23,
The control signal multiplexed with the downlink signal light of the predetermined wavelength is received while switching each wavelength corresponding to each optical network unit, and the downlink signal light wavelength and the uplink signal light wavelength are set according to the control signal An optical network unit for an optical wavelength division multiplexing system, comprising: An optical termination device (OLT) and a maximum of n optical network units (ONUs) are connected via an optical fiber transmission line and an optical power splitter, and downstream signal light transmitted from the optical termination device to each optical network unit, An optical wavelength division multiplexing system that arranges the wavelength bands of upstream signal light transmitted from the optical network unit to the optical termination device so that they do not overlap, and wavelength-multiplexes downstream signal light and upstream signal light of the wavelength assigned to each optical network unit. In the optical terminator of
Control signal transmission means for transmitting a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength set in the newly installed optical network unit as downstream optical signal having a predetermined wavelength not set in each optical network unit An optical terminator for an optical wavelength division multiplexing system. In the optical network unit of the optical wavelength division multiplexing system comprising the optical termination device according to claim 25,
Control signal reception for receiving the control signal from the downlink signal light of the predetermined wavelength while switching each wavelength corresponding to each optical network unit, and setting the downlink signal light wavelength and the uplink signal light wavelength according to the control signal An optical network unit for an optical wavelength division multiplexing system. An optical termination device (OLT) and a maximum of a plurality of n optical network units (ONUs) are connected to each other via an optical fiber transmission line and a wavelength multiplexer / demultiplexer, and are transmitted from the optical termination device to each optical network unit. Wavelength-multiplexed transmission of downstream signal light and upstream signal light of the wavelength assigned to each optical network unit by placing the signal light and the wavelength band of upstream signal light transmitted from each optical network unit to the optical termination device so that they do not overlap In the optical terminator of the optical wavelength division multiplexing system,
Control signal transmission for multiplexing and transmitting a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength set in the newly installed optical network unit to each downstream optical signal of each wavelength corresponding to each optical network unit An optical terminator for an optical wavelength division multiplexing system. An optical network unit of an optical wavelength division multiplexing system comprising the optical termination device according to claim 27,
A control signal receiving unit configured to receive the control signal multiplexed on the downlink signal light of a predetermined wavelength cut out by the wavelength multiplexer / demultiplexer and set the uplink signal light wavelength according to the control signal; An optical network unit for an optical wavelength division multiplexing system. An optical termination device (OLT) and a maximum of a plurality of n optical network units (ONUs) are connected to each other via an optical fiber transmission line and a wavelength multiplexer / demultiplexer, and are transmitted from the optical termination device to each optical network unit. Wavelength-multiplexed transmission of downstream signal light and upstream signal light of the wavelength assigned to each optical network unit by placing the signal light and the wavelength band of upstream signal light transmitted from each optical network unit to the optical termination device so that they do not overlap In the optical terminator of the optical wavelength division multiplexing system,
Control for multiplexing and transmitting a control signal including wavelength setting information of the downstream optical signal wavelength and upstream optical signal wavelength set in the newly installed optical network unit to a downstream optical signal having a predetermined wavelength corresponding to the newly installed optical network unit An optical terminator for an optical wavelength division multiplexing system comprising a signal transmission means. An optical network unit of an optical wavelength division multiplexing system comprising the optical termination device according to claim 29,
An optical wavelength multiplexing system comprising: a control signal receiving unit configured to receive the control signal multiplexed on the downstream signal light having the predetermined wavelength and set an upstream signal light wavelength according to the control signal. Optical network unit. An optical terminator (OLT) and a maximum of a plurality of n optical network units (ONUs) are connected in correspondence with wavelengths via an optical fiber transmission line and a wavelength multiplexer / demultiplexer having periodic transmission characteristics. The downstream signal light to be transmitted to the network unit and the upstream signal light to be transmitted from each optical network unit to the optical termination device are arranged so that they do not overlap with each other. In an optical termination device of an optical wavelength multiplexing system for wavelength multiplexing transmission of signal light,
A control signal including wavelength setting information of a downstream signal light wavelength and an upstream signal light wavelength set in a newly installed optical network unit is transmitted to the wavelength multiplexing / demultiplexing with respect to the wavelength band of the downstream signal light corresponding to each optical network unit. An optical termination device for an optical wavelength division multiplexing system, comprising: control signal transmission means for transmitting broadband downstream signal light separated by the periodicity of the optical device. In the optical network unit of the optical wavelength division multiplexing system comprising the optical termination device according to claim 31,
A control signal receiving unit configured to receive the control signal from the downstream signal light having a wavelength extracted from the broadband downstream signal light by the wavelength multiplexer / demultiplexer, and to set the upstream signal light wavelength according to the control signal; An optical network unit for an optical wavelength division multiplexing system.

Images