WO2004068744A1 - Optical crossconnect system and method for monitoring optical crossconnect system - Google Patents

Optical crossconnect system and method for monitoring optical crossconnect system Download PDF

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Publication number
WO2004068744A1
WO2004068744A1 PCT/JP2003/000913 JP0300913W WO2004068744A1 WO 2004068744 A1 WO2004068744 A1 WO 2004068744A1 JP 0300913 W JP0300913 W JP 0300913W WO 2004068744 A1 WO2004068744 A1 WO 2004068744A1
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WO
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Prior art keywords
monitoring
signal
optical
light
wavelength
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PCT/JP2003/000913
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French (fr)
Japanese (ja)
Inventor
Tadashi Soga
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Fujitsu Limited
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0016Construction using wavelength multiplexing or demultiplexing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005Switch and router aspects
    • H04Q2011/0007Construction
    • H04Q2011/0024Construction using space switching
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/0001Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0062Network aspects
    • H04Q2011/0079Operation or maintenance aspects
    • H04Q2011/0083Testing; Monitoring

Abstract

An optical crossconnect system having a optical switch section for switching main signals fed to a plurality of input sections, and comprising means for generating an optical signal monitoring the optical switch section, means for multiplexing the monitoring optical signal generated by the monitoring optical signal generating means with the main signal and supplying the multiplexed signal to the input port of the optical switch section, means for demultiplexing the monitoring optical signal from an optical signal delivered from the output port of the optical switch section and detecting the monitoring optical signal, and a section for monitoring the optical switch section based on information concerning a monitoring optical signal generated from the monitoring signal multiplexing means, information concerning a monitoring optical signal detected by the monitoring signal detecting means and switch control information at the optical switch section.

Description

Monitoring method art optical cross-connect device and an optical cross-connect device

The present invention relates to a monitoring method of the optical cross-connect device and an optical cross-connect apparatus, in particular, a monitoring method of the optical switch failure optical cross-connect equipment alone can detect light cross-connect device and an optical cross-connect device on. BACKGROUND Akira

Explosive growth of small de yarn over data traffic, which is represented by the recent years of the Internet, follow

, Field

It is a factor to accelerate the introduction of the transmission system of the ultra-high capacity using division multiplexing (T DM) wavelength-multiplexed in addition to transmission technology (WDM) transmission technology when come. In accordance with an increase in the introduction of WDM transmission system, the form of the networks point-to 'point ring network from the system, has been developed into a mesh network from the ring network. In the course of its development, WDM relay node connecting the WDM line between mutually, the system that performs branching 'insertion wavelengths remain light (A dd / D rop M 1 ti 1 ier; OADM) that is used becomes, further currently development, any freely branched wavelengths' 揷入 to system (optical cross-connect device; OXC) has been summer as used. Thus, Ri by the using the WDM technology, to enable large-capacity transmission, eliminating the electrical process at the relay node, a branch in the optical domain 揷入, which enables routing 及 Pi Suitsuchingu. Incidentally, by using the WDM technology, branching and insertion in the optical domain, performing routing 及 Pi Suitsuchingu, pursuit of adaptability and scalability of the network, a network with reduced node cost of the photonic network.

One of the important network Bok work elements constituting a photonic network is an optical cross-connect device. Optical cross-connect device has a function of editing to be sent out to another off Aipa edit a wavelength within route switching tut 及 Pi fiber switching the number of wave length in the fiber to another fiber, transmitted by these features perform capacity management and disaster recovery of the road. The optical cross-connect device are mainly optical repeater node applied to mesh networks. Compared to the optical cross-connect device and a conventional electrical cross-connect device, the cross-connect device,

Since ① the Daitaba line can be switched at high speed, a disaster recovery quickly, flexibly corresponds to the increase or decrease of communication traffic.

② independent fiber transmission speed and transmission Fomatsuto (protocol) of the signal passing can be simplified device configuration.

It has a feature that.

The principle diagram of the optical cross-connect device shown in FIG. A plurality of input optical fibers 1, an optical Suitsuchi 2 and a plurality of output optical fibers 3 i~3 N. The wavelength-multiplexed optical signal transmitted by each of the input optical fiber 1 E and 1 ^^, at the input of the optical cross-connect device, a single wavelength (lambda 1 E ~; separated into optical signals of New, light switch unit It switches the catalog for each by the 2 connexion each wavelength, on the output side of the optical cross-connect apparatus, again, and wavelength multiplex, a device for feeding the transmission line of the output optical fiber 3 ~ 3 Ν. light cross-connections Tato device , since with such a function, typically used for following purposes.

① By using bundling signals of a plurality of transmission paths having low efficiency fewer transmission lines (multiplexed), more efficient use of the transmission path, lowering the cost of the network.

② one different signals of different signal or ground of service mixed in the transmission path of sorts into a signal or signals of the same ground of the same service (for editing).

③ to realize branching 'insertion (A dd / D rop) function.

④ realizing the network switching function when the transmission path has failed.

Method specific basic principle of such the optical cross-connect device is a branched-揷入-pass' replacement is similar to the O ADM. However, O ADM, the main use is a branched insertion of the optical signal, whereas the scale of the optical Suitsuchi portion is 2 X. 2 to the number of X number of optical cross-connect apparatus, the optical path switching major application and then, even scale of the light switch unit, number 10 X number 10~: 1000 X 1000) becomes, as compared to the O ADM also large is needed.

Optical cross-connect device for use in photonic networks, high-speed switching example, flexible capacity controller corresponding, but has the advantage of protocol-free, etc., optical cross-connect device is a device main signal is handled in the state of the optical signal is there. Therefore, monitoring items inside the optical cross-connect device includes an optical input interruption of the optical signal, an item such as an optical input level degradation, monitoring and measurement errors of the path (wavelength), the optical cross-connections Tato device alone difficult It has become. Accordingly, even when the optical switch unit that put the optical cross-connect device malfunctions, it is possible that Ikoto fault detection of the light switch unit.

Figure 2 is a basic schematic diagram of a general optical cross-connect 'nodes (optical cross-connect device) configuration. Light cross-connect nodes, WDM to separate for each wavelength using, as shown in FIG. 2, has been transmitted by the input light off multiplexing 1 i-l 3, the optical filter for optical wavelength division multiplexed signal from the opposite station parts and (demultiplexer) 4i~4 3, the WDM unit (multiplexer) 7i~7 3 for feeding the respective optical wavelength to the wavelength multiplexing opposite station using light force bra, electric convert each wavelength signal once wavelength converting unit that performs to 3 R wavelength converted to a predetermined wavelength after waveform shaping by the playback function (light - electricity - light conversion; O / E / O) and [delta] ^ [delta] ^, by light switch of the route of each wavelength It is consists by a cross-connect unit 5 for switching / Namipigae. As demultiplexer, the number of multiplexers and input and output optical fibers 3, are illustrated, it is of course not limited thereto. Each of these nodes components, some that each is constituted by apparatus alone, the combined elements, some cases also configured as a single device collectively each element in the node. Although in general that constitutes the cross-connect unit with a single device called optical cross-connect equipment, optical cross-connect device in this case, the optical cross-connect input unit 51 as shown in FIG. 2, the optical cross-connect output unit 53, and a main signal section consisting of the optical switch unit 52, and from the monitoring control unit (device controller) 54 for monitoring and control of main signal portion. Light click Rosukoneku preparative output unit 51, 53 is constituted by an optical connector or the like in part for Intafu ace with light switch unit 52 and the external device, the monitor light level for device monitoring in this area there also be provided. Light Suitsuchi 52 mechanical, planar waveguides expression, several methods bubble type etc. is used, micromachine technology (ME MS: M icro E lectro Me chanical Sy st ems) microscopic mirrors expression using things liable to large capacity as Matrigel task type switch, is commonly used as a switch for optical cross-connect. As described above, the optical cross-connect device, since the main signal in the apparatus are all Nos Mitsunobu, as the main signal monitoring item, light input break, the optical input level deterioration common in other signal fault detection the wavelength converting portion for processing a signal is to perform the monitoring once with electrical level. In this case, the light for the health of the switch operation of the cross-connect device (path setting), only the light level of the optical cross-connect input checking is not complete, it can not be accurately checked normal operation.

In the structure of the conventional optical cross-connect device shown in FIG. 2, because the main signals between the device input and output are all optical signals, (out of synchronization, fault indication signal, bit error, etc.) line failure due to failure or switch unit main signal monitoring, and to confirm the switch operation (path setting) normality is monitoring in the wavelength conversion unit for performing signal processing becomes necessary in the state of an electrical signal.

Increase in future communication capacity, the network with the advances in technology evolves, at each communication node, the process proceeds further photonic reduction, in particular, the signal processing requirements of an all light communication Bruno de Core is, the wavelength converting portion as the current is estimated to be replaced in the wavelength conversion method without or electrical conversion is deleted. As a result, each node of the photonic network, will be constituted by the WDM unit and the optical cross-connect section in FIG. 2, the main signal is only monitoring the light level, sync loss or failure display signal (A 1 arm I ndicatesigna 1; AIS), a logical monitoring such as monitoring of bit errors becomes impossible. In particular, in respect of light switch unit, it is difficult to take the corresponding input light and output light, for example, Suitsuchi operation (path setting) due to the failure of the switch if it also output light to the port set as is erroneous if different from the original setting, the optical cross-connect device be light from erroneous input ports can not only detect a light level, error in the switch settings are not detected. Indeed the error switch operation is detected, so after reaching the apparatus for performing signal terminates at electrical level of the signal destination, detection is much light Suitsuchi disorders (anomalies Suitsuchi operation / path setting) It will be delayed. Disclosure of the Invention

The present invention solves the prior art problems described above, the generic object to provide an optical cross-connect device which is improved.

A first object of the present invention etc. object to provide an optical cross-connect device capable you to detect light switch failure in the optical cross-connect equipment alone.

To this end, optical cross-connect device of the present invention, in the optical cross-connect equipment having an optical switch unit which performs switch of the main signals supplied to the plurality of input portions, monitoring the light switch unit a monitoring signal generating means for generating a monitoring light signal for a monitoring light signal in which the monitoring signal generating means has generated, the main signal and multiplexes the monitoring signal combiner supplying to an input port of the optical switch portion means and the monitoring light signal demultiplexed from the optical signal output from the output port of the optical scan Itsuchi portion, and the supervisory signal detecting means for detecting a monitoring light signal, the monitoring signal generating means has generated the monitoring optical signals information relating to, based on Suitsuchi control information of said supervisory signal detection means according to the monitoring light signal detected information and the light Suitsuchi unit, a monitoring unit for monitoring the light Suitsuchi portion Configured to have.

Further, from the viewpoint of monitoring method of an optical black ^ connect apparatus, a monitoring method of the optical cross-connect device of the present invention, the optical cross-connect device having a light switch unit which performs switch of the main signals supplied to the plurality of input portions in the monitoring method, a monitoring signal generating step of generating a monitoring light signal for monitoring the optical switch unit, a monitoring light signal generated in the monitoring signal generating step, the main signal and multiplexes the light a monitoring signal combiner supplying to an input port of the Suitsuchi unit, a monitoring light signal demultiplexed from the optical signal output from the output port of the optical Suitsuchi unit, a monitoring signal detecting step of detect a monitoring light signal , the monitoring signal multiplexing information related to audit Miko signal generated in step, according to the monitoring light signal detected at said monitoring signal detecting step information Based on Suitsuchi control information of the fine the light Suitsuchi portion can be made to have a monitoring step for monitoring the light Suitsuchi unit. BRIEF DESCRIPTION OF THE DRAWINGS

Another object of the present invention, features and advantages with reference to the accompanying drawings, by reading the following description, will become more apparent. Figure 1 is a principle diagram of the optical cross-connect.

Figure 2 is a basic schematic diagram of a general optical cross-connect node configuration.

Figure 3 shows the principle of the present invention.

Figure 4 is a schematic configuration example of the 1. Example.

Figure 5 is a schematic configuration example of the second embodiment.

Figure 6 is a schematic configuration example of the third embodiment.

Figure 7 is a schematic configuration example of the fourth embodiment.

Figure 8 is a schematic configuration example of the fifth embodiment.

Figure 9 is a schematic configuration example of the sixth embodiment.

Figure 10 is a diagram for explaining the distribution of the monitoring signal.

Figure 11 is a process flow diagram for monitoring method of an optical cross-connect device. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of the present invention with reference to the accompanying drawings.

The principle diagram of the present invention shown in FIG. Optical cross-connect apparatus 11 of FIG. 3, the signal input unit 12 1 12 2, the wavelength multiplexing means 13 have 13 2, monitoring signal generating means 14 have 14 2, the optical switch unit 15, the wavelength demultiplexing means 16 have 16 2, supervisory signal detection means 17 have 17 2, and a signal output unit 18 have 18 2 and the monitoring control unit 20. The monitoring control section 20 monitors the signal generation control unit 21, the alarm output unit 22, the optical switch switching control unit 23, and a monitor signal detection controller 24 and the comparison unit 25.

The input side of the optical switch 15, the number of input ports wavelength combining splitting means 13 I 13 2 are provided (the number of performing path monitoring), the main signal to one input of a wavelength multiplexing unit 13 have 13 2 (/ XI, λ 2) is connected, the output of the wavelength multiplexing unit 13 l 13 2 is supplied to the input port of the optical Suitsu switch unit 15. The other input of the wavelength multiplexing unit 13 have 13 2, from the monitoring signal generating means 14 I 14 2 set by the monitoring control unit 20, different wavelengths monitoring signal of the main signal (A s) is It is connected. As a result, the optical switch 15, the main signal and the supervisory signal is an optical signal wavelength-multiplexed is input, the optical wavelength multiplex signal in accordance with the switching of the route of the optical switch unit 15, the corresponding light is output to the switch output port. Multiwavelength of the outputted main signal and the monitoring signal from the optical output port - one - heavy signal is input to the wavelength demultiplexing means provided on the output side of the optical Suitsuchi section 1 5, 'the main signal and the supervisory signal is separated into bets, the main signal is output from the optical cross connect apparatus 1 1 is transmitted to the signal output of the optical cross-connect device. Separated monitor signal detects the monitor signal by the monitor signal detection means 1 7 i, 1 7 2, line O 0 monitoring signal content in the monitor control section 2 0

WDM 1 s 3 1 3 2 in FIG. 3, the monitoring signal generating means 1 4 There 1 4 2, the monitoring signal detecting unit 1 7 There 1 7 2, the optical switch portion 1 5 in the optical cross connect apparatus 1 1 the number of input and output (number of input and output ports), are provided. Further, in the monitoring signal generating hand stage 1 4 There 1 4 2, the monitoring signal such that each input of the optical Suitsuchi part 1 5 can determine is generated. That is, the monitoring signal generated from the monitoring signal generating means 1 4 There 1 4 2 so that the signal of each different contents for each input port of the optical switch portion 1 5 is output, the monitoring of the monitoring control unit 2 0 It is set by the signal generation control section 2 1. Monitoring signal detected by the monitoring signal detector 1 7 There 1 7 2 is sent to the monitor control section 2 0, is whether the what path setting light Suitsuchi the detection signal (route switching of) have been made It is confirmed. Monitoring control whether path setting is performed normally is optical cross-connect device by comparing the results of the above Suitsuchi control performed for the paths set to the information and the optical switch of the obtained path set by the monitoring signal Ru can (i.e. apparatus alone) determination in parts.

Next, the operation of FIG. 3 as in the solid line switch control 1 view of the optical switch portion 1 5, the input port A and the output port C, and is configured to connect the input port B and the output port D.

In this case, if the optical switch portion 1 5 is normal, the main signal into the input port A; and 1 1 monitoring signals of the monitoring signal generating means 1 4 the monitoring control unit 2 0 is set (shall be the monitoring signal a) are wavelength-multiplexed, is switched to the optical switch portion 1 5 as a solid line, is output to the output port C. Optical signal output from the output port C C (lambda 1, the monitoring signal a) is a wavelength division by the wavelength demultiplexing means 1 S i, the main signal (lambda 1) is output to an external monitor signal a is transmitted to the monitoring signal detecting unit 1 7 i, the monitoring signal a is detected by the monitoring signal detector 1 § 丄.

In this way, setting the setting of the optical switch portion 1 5 and the input port A and the output port C is connected, monitoring signal a from the supervisory signal detecting means 1 7 i in the monitor signal generating means 1 4 expectations It is, can be recognized by the monitor control unit 2 0 that are path setting operates in place properly switching the light Suitsuchi by the street monitoring signal is received.

Similarly, with the configuration of the input port B and the output port D is connected, by monitoring the signal b is checked by the monitoring signal detecting unit 1 7 2, normal of light Suitchipasu setting can be confirmed.

However, failure of the optical switch portion 1 5 (e.g., MEM S mirror movable portion is such as jammed by adhesion of dust) If, for example, the input port A and the output port from D, connected between the input port B and the output port C , the input port a and the output port C, so as to connect the input port B and the output ports D, despite the sWITCHING setting switch of the optical switch portion 1 5, the actual route is dotted line in FIG. 3 the way, the input port a and the output ports D, you that remains of the connection between the input port B and the output port C. In this case, the monitoring signal a is detected by the detection means 1 7 2 via the output port D and the input port A, the monitoring signal b is detected by the detection means 1 7 i via the output ports C and input port B It becomes Rukoto.

Therefore, in this case, as the optical switch switching control unit 2 3 was set boss of the monitoring control unit 2 0, if the optical switch portion 1 5 if performing the switching, monitoring signal a from detecting means 1 7 丄 is is detected, from the detection means 1 7 2 despite the monitoring signal b is detected, the detected monitoring signal b from the detection means 1 7 i, the monitoring signal a is detected from the detection means 1 7 2 since, the comparator 2 5 of the monitor control unit 2 0 detects a mismatch of the signal which is expected, the actually detected signal. Alarm output unit 2 2 receives a disagreement signal from the comparator unit 2 5, and alarm output. Thus, it is possible to detect the abnormal state switching due to a failure of the optical Suitsuchi portion 1 5.

Note that although an example for 2-pass 3, the same result as in FIG. 3 by can have One in three passes over multiple paths providing different number of only monitoring signal path. As described above, wavelength multiplexing means / demultiplexing means between the input and output unit and the light switch of the optical cross-connect the device, a monitoring signal generating means / detecting means is provided, after light Suitchipasu setting of the monitoring signal control, detection, monitoring by performing, it is possible to confirm the normality of the light Suitsuchi operation (Suitsuchipasu setting). Further, it is possible to detect the failure of the conventional optical switch has been impossible in the optical cross-connect device only optical cross-connect device.

(First Embodiment)

Figure 4 shows a schematic configuration example of the first embodiment. Shows an example of optical cross-connect device in a case where the optical switch unit 35 is employs a matrix sweep rate Tutsi of n X n 5 in FIG.

FIG optical cross-connect device 3 1 4 wavelength multiplexing part 3 i S 2 n, the monitoring signal generation unit 3 3 i 3 3 n, the monitoring signal light source 34 3 4 n, the optical switch unit 35, the wavelength demultiplexing part 3 6 i 3 6 n, the monitoring signal receiving section 3 7 i 3 7 n, and a supervisory signal detector 3 8 3 8 n及Pi monitoring controller 3 9.

In the optical cross-connect devices 3 1 10 4, between the optical cross-connect devices 3 each signal input unit 1 n and the optical switch portion 35 of the 1, the input ports of the optical Suitsuchi portion 35 (# l # n ) corresponding to the wavelength multiplexing part 3 2 i 3 2 n are provided. The wavelength multiplexing unit 3 2 3 2 n are provided for each respective main signal, the monitoring signal light source of a wavelength of the main signal (1 or 2 ··· λη) same wavelength U s different from) and each main signal and 15 output light 34 i 34 "to wavelength multiplexing, the optical switch unit 35 supplies. output light of each monitoring signal light source 34 34 n, for each input port (# l # n) It is modulated by the prepared surveillance signal generator 3 S i S monitoring signal generated by 3 n.

Note that the monitoring signal is a monitor signal of a different content for each input port. The monitoring signal is light Suitchipasu necessary information in order to monitor the configuration (e.g., path trace signal No. 20, the optical switch input port ID, etc.), and is set by the monitoring control unit 3 9.

At the output side of the optical switch unit 35 is the main signal and the supervisory signal and the demultiplexed by the wavelength demultiplexer 3 6 i 3 6 n. Among wavelength;! Monitoring signal L s, the monitoring signal receiving section 3 7 via the ~ 3 7 n, transmitted monitoring signal detecting unit 3 S t S 8, Ru is information of the monitoring signal is read. A monitoring signal generated by the monitoring signal宪生part 3 3 3 3 ", and the monitoring signal read by the monitoring signal receiving section 3 7 25 3 7 n, on the basis of the switch control information with respect to the optical switch unit 35, the monitoring control unit 3 9, to confirm the normal operation relating to the path setting of the optical switch unit 35.

Monitoring the signal generating unit 3 3 3 3 n may generate any signal if the signal capable of identifying the input port of the optical Suitsuchi 3 5 for recognizing the setting of the path of the light Suitsuchi 3 5 . For example, information representing the port number or ch number on the input side as a path trace signal (e.g., 00000001: chl, 00000010: ch 2, · ■ · etc.).

Based on the switching information relates to an optical switch unit 35, a monitoring signal is estimated at each output port of the optical switch unit 35, when the monitoring signal actually detected at each output port is match over, the light switch unit 3 set path in 5 is normal, if they do not match, the setting of the path is abnormal, visual control unit 3 9 that identifies.

The first embodiment is, for example, as shown in FIG. 4, the wavelength multiplexer wave portion in front after the optical switch section, the wavelength demultiplexing unit, monitoring the signal generator, the monitoring signal light source, the monitoring signal receiving section, the monitoring signal the provided set of monitoring signals can detect the light switch failure in the optical cross-connect equipment alone by comparing detection and optical switch controller No. detection unit.

(Second embodiment)

Figure 5 shows a schematic configuration example of the second embodiment. FIG optical cross-connect device 4 1 5, the wavelength multiplexing unit 3 2 i~ 3 2 n, the monitoring signal generation unit 3 3 i~ 3 3 n, the monitoring signal light source 4 4 1 to 4 4 n, light Suitsuchi portion 3 5, the wavelength demultiplexer 3 6 i~3 6 n, the monitoring signal receiving section 3 7 x to 3 7 n, and a supervisory signal detector 3 S i S 8 n and the monitoring control unit 4 9. In the figure, the same portions as shown a portion in FIG. 4 is displayed by the same reference numerals. First monitoring signal light source 3 4 ~ 3 4 n in the embodiment of FIG. 4, the wavelength of the main signal (λ 2, · · ·, 2 η) for the a light source of a different same wavelength (s) contrast, the wavelength of the second light source for monitoring the signal in the embodiment of 4 4 i~4 4 n in FIG. 5, the wavelength of the main signal (2 1, λ 2, · · ', n) differs from the further, each light source monitoring signal 4 4丄~ 4 4 n wavelengths wave lengths are different from each other of (sl, X s2 ^ · · ·, I sn) in that it is, the second embodiment includes, in the first embodiment different. The other configuration and operation are the same, the description is omitted.

Incidentally, the optical switch unit (especially in the case of mechanical MEM, etc.), by a plurality of optical signals internally intermingled, each signal interfere with each other, deteriorating the optical signal waveform in the form of crosstalk make. In particular, as in the first embodiment, the crosstalk when the signals of the same wavelength is more exchange complex (coherent cross talk) of the degree of deterioration of the waveform large heard. In contrast, as the monitoring signal source wavelength in the second embodiment, due to the use of light sources of all different wavelengths, it is possible to suppress the influence of such coherent crosstalk minimum limit, more primary the small monitor signal influence on the signal, it is possible to perform Hikarisu Itchipasu monitoring.

(Third Embodiment)

Figure 6 shows a schematic configuration example of the third embodiment. Optical cross-connect device 5 1 6, the wavelength multiplexing unit 3 2 i 3 2 n, the optical switch unit 35, the wavelength demultiplexing section 3 6 3 6 n, monitoring the signal receiving section 3 7 ~ 3 7 n, emission controller 5 3 5 3 n, and a monitor signal for the light source 5 4 E ~ 5 4 n and monitoring controller 5 9. In the figure, the same portions as part component shown in FIG. 4 is displayed by the same reference numerals.

The third embodiment, in place of the first monitor signal generator 3 in Example 3丄~ 3 3 n及beauty monitoring signal light source 3 4 ~ 3 4 n in FIG. 4, the light emission control unit 5 3-5 those with 3 n及Pi monitoring signal light source 5 4 i~ 5 4 n.

The third embodiment includes a light emission control unit 5 3 i 5 3 n, and control and monitoring signal light source 5 4 i 5 4 n, the light emission of the light source the monitoring signal, further, monitors for monitoring light Suitchipasu and a control unit 5 9, under the control of the monitoring controller 5 9, the light emission control unit 5 3 E ~ 5 3 n, the monitoring signal light source 5 4 i 5 4 n one ^^ is emission in turn a shall be controlled to.

In the optical cross-connect device 5 1 6, between the optical cross-connect device 5 1 each signal input portion and a light switch unit 35, to the input ports of the optical switch portion 35 (# 1 # n) correspondingly, the wavelength multiplexing unit 3 2 i 3 2 n are provided. Each input port, respectively, the main signal (the wavelength: λ 1 λ 2 λ η) than is supplied, in other words, the wavelength multiplexing unit 3 2 Interview ~ 3 2 eta, each main signal It is provided. The wavelength multiplexing unit 3 2 i~ 3 2 η, the main signal of the wavelength deleted 1 2 · · · / I n ) a monitoring signal light source 5 4 E ~ 5 4 n having the same wavelength (s) of different is an output light and the main signal by wavelength multiplexing the optical switch unit 35 supplies. Monitoring controller 5 9, one of the light sources 5 4 5 4 n for each monitoring signal is controlled so as to emit light sequentially.

At the output side of the optical Suitsuchi unit 35 is the main signal and the supervisory signal and the demultiplexed by the wavelength demultiplexer 3 6 ~ 3 6 n. Monitoring signals of these wavelength s is detected by the monitoring signal receiving section 3 Y i S 7 n. From one of the monitoring signal light source 5 4 to 5 4 n, and one input port information monitoring signal is supplied, an output port information of the received monitoring signal receiving section 3 is Y i S 7 n, light on the basis of the switch control information for switch unit 35, the monitoring control unit 5 9, to confirm the normal operation relating to the path setting of the optical Suitsuchi portion 35.

That is, the monitoring controller 5 9, an input port information of the input port monitoring signal is supplied, on the basis of the switching information to an optical switch unit 35, estimates the output port monitor signal is output, further, monitoring controller 5 9, an output port which is estimated, in fact when the received output ports are matched, path setting in the light Suitsuchi unit 35 is normal, if they do not match, set the path identifying that it is abnormal. Incidentally, the monitoring signal receiving section 3 7 ~ 3 7 n provided for each output port may be to work only monitoring signal receiving section related to the output ports of estimating the monitoring signal is output, all monitor signal receiving section 3 7 may be to 3 7 n to operate.

Moreover, the monitoring controller 5 9, the light emission control unit 5 3 controls the ~ 5 3 n, controls to one of the light sources 5 4 ~ 5 4 n for each monitoring signal is to emit light in sequence instead , as shown in FIG. 1 0, one of each monitoring signal light source, may be distributed in sequence.

Distribution of the monitoring signal in FIG. 1 0 uses a one-to-n selection device 9 2. Selection device 9 2 selects the output of the monitoring signal light source 9 1, and outputs the single wavelength multiplexing part 3 2 i~3 2 n. Selection control of the selection device 9 2, Ru is based on the output of the selection device 9 2.

The first embodiment, by monitoring the control and monitoring signals of the monitoring signal obtained by modulating the path trace corresponding signal at light, and performs confirmation of normal operation at all times light Suitsuchipasu. However, in general, route switching light Suitsuchi switches times lines to the backup path at the time of line failure, the replacement of the light path for the line efficiency, insertion, or the like in the main purpose branch, within a short period of time It does not usually carried out frequent switching of. In this case, the usage of the optical cross-connect device does not have to do at all times even failure detection path setting often requires only periodic monitoring at a period of extent in.

Therefore, the light source 5 4 i to 5 4 n supervisory signal in the configuration of the third embodiment, the light source 5 light source 5 4 2 → - source 5 4 n → source 5 4 →, · · · and periodically emitting It is controlled. Further, when receiving the monitoring signal in the monitoring signal receiving section 3? 37 n, the monitoring controller 5 9, emission control information of the monitoring signal light source, the light-reception information relating to the monitoring signal receiving section, based on the control information of the optical switch , it is possible to monitor the path setting status of the light Suitsuchi. The third monitoring signal light source 54 to 54 in the embodiment of "does not emit light more than at the same time, periodically, it controls light emission so as to periodically emit light at time intervals which can be light detected by the light receiving unit. Thus, the third embodiment, the monitoring signal generation unit required in the first embodiment, the monitoring signal detector is not required, the circuit scale, configuration much additional simple light emission control unit instead in capable of optical Suitchipasu setting monitoring. Further, each monitoring signal light source is also a big reduction of the power consumption to become periodically short lighting without constantly turned.

Third embodiment, for example, as shown in FIG. 6, wavelength multiplexing wave portion in front after the optical Suitsuchi unit, the wavelength demultiplexing unit, provided the monitoring signal light source, the light emission control unit, the monitoring signal receiving section, the monitoring performs lighting control of the signal light source periodically, a light source lighting information for monitoring signals, it is possible to detect the light switch failure in the optical cross-connect device itself monitors the signal detection (light receiving) result comparing the optical switch control .

(Fourth Embodiment)

Figure 7 shows a schematic configuration example of the fourth embodiment. Optical cross-connect device of FIG. 7 61, wavelength multiplexing unit 32I~32 n, the optical switch unit 35, the wavelength demultiplexing unit 36 i to 36 n, monitoring the signal receiving unit 37I~37 n, the light emission control unit 5 Si S 3 n, and a monitor signal source 64 ~ 64 n and the monitoring control unit 69. In the figure, the same portions as part component shown in FIG. 6 is displayed are designated by the same reference numerals.

The third light source 54 E through 54 n for monitoring signals in the embodiment of FIG. 6, the wavelength of the main signal (; Ll, λ 2, ·· ', In) of a light source of a different same wavelength (s) and contrast, the fourth wavelength of the monitoring signal light source 64 to 64 n in the embodiment of FIG. 7, similarly to the second embodiment, the wavelength of the main signal (1, 2, ···, λη ) Unlike further wavelength the wavelength of the monitoring signal light source 64 to 64 11 are different from each other (Lsl, Ls2, ···, 1 sn) is a point, the fourth embodiment is different from the third embodiment . The other configuration and operation are the same, the description thereof is omitted.

In the fourth embodiment, as the monitoring signal source wavelength, due to the use of light sources of all different wavelengths, the monitoring signal receiving section 3 7 i~3 7 n及Pi monitoring controller 5 9, the wavelength monitoring signal by considering, Ru can monitor reliable light Suitchipasu.

(Fifth Embodiment)

Figure 8 shows a schematic configuration of the fifth embodiment. Optical cross-connect device 71 of FIG. 8, the wavelength multiplexing unit 3 2 i~3 2 n, optical Suitsuchi unit 35, the wavelength demultiplexing section 3 6 to 3 6 n, light emission control unit 7 3 E-7 3 n, the monitoring signal light source 7 4 ~ 7 4 n, and a light-receiving wavelength detector (e.g., Hikarisupe click tram analyzer, an optical wavelength selective level meter) 7 7 ~ § 7 n and the monitoring control unit 7-9. In the figure, the same portions as shown a portion in FIG. 4 is displayed by the same reference numerals.

In the fifth embodiment, like the third embodiment and the fourth embodiment, in which using the light source for emission control unit 及 Pi monitoring signal. The monitoring signal light source in the fifth embodiment. § ~ §, like the fourth embodiment, the wavelength of the main signal (1, λ 2, · · ·, n) differs from the further, each monitoring signal light source 7 4-7 4. Wavelength wavelengths are different from each other (sl e,; L s2, · · ·, X sn) are used. While with force, the fourth embodiment, while the optical Suitsu-path information for monitoring exists also the presence or absence of light emission of the light source, the fifth embodiment, the information for the optical Suitchipasu monitored is output from the light source except that resides in the wavelength of light. The fifth embodiment includes a light emission control unit 7 3 i to 7 3 n, and the monitoring signal light source 7 4 ~ 7 4 n, the photosensitive wavelength detector 7 7 for receiving an output of the light source the monitoring signal i~7 and 7 n, to control the emission of the monitoring signal for the light source further comprises a monitoring control unit 7-9 for monitoring light Suitsuchipasu, under the control of the supervisory control unit 7 9, the light emission control unit 5 3-5 3 n, the light emission is controlled.

Incidentally, the monitoring control unit 7-9, may be controlled so as to simultaneously emit all the light emission control unit 7 3 ~ 7 3 n, as in the third embodiment and the fourth embodiment, a monitoring signal one of the light source 7 4 1-7 4 ", may be controlled so as to emit light sequentially.

In the optical cross connect apparatus 71 of FIG. 8, between each signal input of the optical cross-connect apparatus 71 and the optical switch unit 35, the input ports of the optical switch portion 3 5 (# 1 ~ # n) in response to the wavelength multiplexing part 3 2 ~ 3 2 n it is provided. Further, each input port of the optical sweep rate Tutsi unit 35, respectively, the main signal (the wavelength: example 1, 2, · · ·, λη) is supplied. The wavelength multiplexing unit 3 Zi S 2 n, the wavelength of the main signal (1, λ 2, ···, λη) Unlike Moreover, each monitoring signal light source 74-74. Wavelength wavelengths are different from each other (Asl,; Ls2, ···, sn) is.

At the output side of the optical Suitsuchi unit 35 is the main signal and the supervisory signal and the demultiplexed by the wavelength demultiplexer 36 ~ 36 n. Among wavelength sl,; Ls2, · · ·,; monitor signal Lsn is detected by the light receiving wavelength detector 77i~77 n. Information identifying the input port and the wavelength information of the monitoring signal applied to its input port, receiving the information and the monitoring signal receiving section for specifying an output port of the light receiving surveillance signal light receiving section 37i~3 7 n and wavelength information, based on the Suitsuchi control information for the optical Suitsuchi unit 35, the monitoring control unit 79, to confirm the correct operation regarding path setting of the optical Suitsuchi portion 35.

In other words, the monitoring control unit 79, an input and port information and wavelength information of the input port monitoring signal is supplied, on the basis of the switching information relates to an optical switch unit 35, the output monitor for each output port monitoring signal is output estimate the wavelength of the signal light, further, the monitoring control unit 79, a wavelength that appears on the estimated output port, actually if the wavelength appearing on the received output port Bok is match over, in the light switch unit 35 path setting is normal, if they do not match, identifies a set of path is abnormal.

(Sixth Embodiment)

Figure 9 shows a schematic configuration example of the sixth embodiment. Optical cross-connect apparatus 81 of FIG. 9, the optical switch unit 35, the wavelength demultiplexing unit 3 e S 6 n, the photosensitive wavelength detector 7 Ί ~17 n, the monitoring control unit 89, the optical wavelength filter 90 1 to 90 n, the variable and a wavelength light source 91 and the optical branching unit 92. In the figure, the same portions as shown a portion in FIG. 8 is displayed are designated by the Nos same marks.

Sixth embodiment of the place fifth light emission control unit 73 - 73 eta及Pi監vision signal source 74 to § 4 This in the embodiment of FIG. 8, the optical wavelength filter 90 i~90 η, the variable wavelength light it is obtained using a source 91 及 Pi optical branching unit 92.

Providing a variable wavelength light source 91 whose wavelength varies as a monitoring signal light source, performs the sweep of the optical output wavelength to match the monitoring period. The output of the variable wavelength light source 91, by 及 Pi light branching section 9 2, the number of optical wavelength filter (here, eta) branches to. For example, the output of the variable wavelength light source 91, 1: eta of the input to a simple optical splitter 92 with a light force bra or the like, each output of the frequency岐後each of the optical wavelength filter 90 to 9 O n It is input.

Variable wavelength light source 9 1, the wavelength range of the monitoring signal (e sl, Ls2, · · ·, sn) can force out of the light, emitted to sweep the optical wavelength of each monitoring signal at a fixed monitoring period ing. Output of the light source that emits light by sweeping the wavelength and the temporal lambda sl → e s2 → ^ sn at regular intervals (a few minutes wavelength filter) into n branched by the optical branching section 9 2, each is supplied to the optical wavelength filters 90 to 90 n. In the optical filter 90 i~90 n, for selectively passing only a fixed wavelength corresponding to each light Suitsuchi input port, the wavelength swept optical signal input to the wavelength filter 9 (^ 90 n, only selected wavelengths of the filter fixing There is output, the other light is not output. in the example of FIG. 9 Lsl, Ls2, ..., is are each signal input 1, 2, ..., wavelength multiplexing unit which corresponds to n 3 2 ~ 3 periodically being multiplexed by 2 n, is input to the optical switch unit 35.

In the sixth embodiment, since that allows a large number of path setting monitor monitoring signal light source with one, power consumption, can be reduced apparatus scale, leaving the control of the monitoring signal light source can be simplified.

As shown in FIG. 1 1, the monitoring method of the optical cross-connect device having a light switch unit which performs Suitsuchi the main signal supplied to the plurality of input can be performed by four steps shown below.

(1) monitoring signal generating stearyl-up to produce a fit monitoring light signal for monitoring the optical Suitsuchi portion (S 1 0).

(2) the monitoring optical signal generated in the monitoring signal generating step, the main signal and multiplexes, the monitoring signal combiner supplying to an input port of said optical Suitsuchi section (S 1 1)

(3) demultiplexing the monitoring light signal from the optical signal output from the output port of the optical Suitsuchi unit, the monitoring signal detecting step of detecting a monitoring light signal (S 1 2).

(4) the monitoring signal multiplexing information generated according to the monitoring light signal in step, on the basis of the Suitsuchi control information of the information relating to the detected monitoring light signal and the light sweep rate Tutsi unit before Symbol supervisory signal detection step, the light monitoring stearyl-up to carry out the monitoring of Suitsuchi part (S 1 3).

In this manner, according to each embodiment, the optical cross-connect equipment alone can detect light Suitsuchi disorders including disorders of the difficulty or ivy Suitsuchipasu setting of the detection (optical Suitsuchi switching operation) by the equipment itself, the optical cross it can accelerate the failure detection time on the system including a connect device.

Further, according to the embodiment, by supplying a monitoring signal generated by the monitor signal generating means to the optical switch unit, irrespective of the optical signal input state from the outside, at all times, performing failure monitoring of the optical sweep rate Tutsi unit be able to. Moreover, not been monitored using a main signal, it can be before the start of operation the user to confirm that the optical switch circuit according to the user to function reliably.

The present invention is not limited to the specifically disclosed embodiments without departing from the scope of the claimed invention, various modifications can be considered and embodiments.

Claims

In 1. Performs Suitsuchi of the supplied main signal to a plurality of input portions' optical cross-connect device having a light Suitsuchi portion,
A monitoring signal generating means for generating a monitoring light signal for monitoring the optical Suitsuchi unit, a monitoring light signal in which the monitoring signal generating means has generated, the main signal and multiplexes the input port of said optical Suitsuchi portion and monitoring the signal multiplexing means for supplying,
And demultiplexes the monitoring light signal from the optical signal output from the output port of the optical Suitsuchi portion, and the supervisory signal detecting means for detecting a monitoring light signal,
According to the optical signal of the monitoring ≤ which said monitoring signal generating means to generate information based on said information monitoring signal detecting hand stage according to the monitoring light signal detected and Suitsuchi control information of the optical Suitsuchi portion, of the light switch unit optical cross connect instrumentation circumference having a monitoring unit for monitoring
Location.
2. The monitoring signal combining means or the supervisory signal detecting means, light click port Sukonekuto apparatus according to claim 1, wherein provided for each output port of the input port or the light Suitsuchi portion of the optical switch portion.
3. wavelength of monitoring light signals by each monitoring signal generating means has generated provided for each input port of said optical Suitsuchi unit, the optical cross-connect device according to claim 2, wherein the same wavelength.
4. Wavelength of the light Suitsuchi portion of the input port monitoring light signals by each monitoring signal generating means has generated provided for each, the optical cross-connect device according to claim 2, wherein the different wavelengths.
5. The supervisory signal detecting means, the optical cross-connect device according to claim 4 having a photosensitive wavelength detector.
6. The monitoring signal generating means includes a monitoring signal light source, and a monitoring signal generating means for generating information for order to monitor the optical switch portion,
Wherein the information for monitoring the optical Suitsuchi section supervisory signal generating means generates the optical cross-connect device according to claim 3 or 4, wherein the information for specifying an input port of said optical Suitsuchi unit.
7. The monitoring signal generating means includes a monitoring signal light source, and a light emission controller for controlling light emission of the light source the monitoring signal,
It said light emission control means, optical cross-connect device according to claim 3, wherein one light source for monitoring signal in the monitoring signal generating means provided for each input port of said optical Suitsuchi unit is controlled so as to emit light.
8. The monitoring signal generating means has an output selection means for selecting the output of the monitoring signal light source and said monitoring signal light source,
The output selecting means, optical cross-connect device according to claim 3, wherein the selection control so that the monitoring signal is output from one of the monitoring signal generation means provided for each input port of said optical Suitsuchi unit.
9. Each monitoring signal detecting means provided for each output port of the optical switch unit, an optical cross-connect device according to claim 7, wherein detecting the audit Miko signals simultaneously.
1 0. The monitoring signal generating means includes a monitoring signal light source, and a light emission controller for controlling light emission of the light source the monitoring signal,
It said light emission control means, optical cross-connect device according to claim 4, wherein one light source for monitoring signal in the monitoring signal generating means provided for each input port of said optical Suitsuchi unit is controlled so as to emit light.
1 1. The monitoring signal generating means includes a tunable wavelength light source of varying wavelengths on the time axis, the light and the optical wavelength filter provided for each input port of the Suitsuchi portion, the variable wavelength light source each said light output optical cross-connect device according to claim 4 Symbol mounting and an optical branching means for branching the wavelength filter.
1 2. The wavelength of the monitoring signal generating means has generated monitoring light signals, the monitoring optical signal and claims 1, characterized in the different wavelengths of the main signal are multiplexed 1 1 according to any one claim optical cross-connect device.
1 3. The main signal, the optical cross-connect device of claims 1, wherein 1 2 any one claim to be a single wavelength or wavelength group.
In 1 4. Monitoring method of a plurality of optical cross-connect devices that have a light Suitsuchi unit that performs Suitsuchi of the supplied main signal in the input section,
A monitoring signal generating Sutetsu flop for generating a monitoring light signal for monitoring the optical switch portion,
A monitoring light signal generated in the monitoring signal generating step, the main signal and multiplexes a monitoring signal combiner supplying to an input port of the optical switch unit, which is output from the output port of the optical Suitsuchi portion and demultiplexes the monitoring light signal from the optical signal, and the supervisory signal detecting step of detecting a monitoring light signal,
Information relating to the monitoring light signal generated in the monitoring signal multiplexing step, on the basis of the information relating to the detected monitoring light signal in the monitoring signal detecting step and switch control information of the optical switch portion, the monitoring of the optical switch portion monitoring method for an optical cross-connect device and having a monitoring step of performing.
PCT/JP2003/000913 2003-01-30 2003-01-30 Optical crossconnect system and method for monitoring optical crossconnect system WO2004068744A1 (en)

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JP2006157359A (en) * 2004-11-29 2006-06-15 Fujitsu Ltd Optical transmission device, automatic optical connection method and automatic optical connection program
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JP2010045805A (en) * 2009-09-24 2010-02-25 Nippon Telegr & Teleph Corp <Ntt> Connection status monitor for optical cross-connect system
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