WO2006085356A1 - 光入力断検出装置 - Google Patents
光入力断検出装置 Download PDFInfo
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- WO2006085356A1 WO2006085356A1 PCT/JP2005/001850 JP2005001850W WO2006085356A1 WO 2006085356 A1 WO2006085356 A1 WO 2006085356A1 JP 2005001850 W JP2005001850 W JP 2005001850W WO 2006085356 A1 WO2006085356 A1 WO 2006085356A1
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- alarm
- los
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/03—Arrangements for fault recovery
Definitions
- the present invention relates to an optical transmission apparatus, and particularly detects an input signal interruption of an optical signal received by a terminal station or a relay station in a synchronous optical communication network such as SDH (Synchronous Digital Hierarchy) or SONET (Synchronous Optical Network).
- SDH Synchronous Digital Hierarchy
- SONET Synchronous Optical Network
- An end station or relay station in a synchronous optical communication network detects an error such as an optical input interruption by monitoring an input level of an optical signal received from an opposite station and calculating an error rate of received data. It has.
- an abnormality such as loss of optical input (LOS)
- the terminal station or relay station switches the communication path from the work system to the protect system to maintain the normal communication state, An alarm to that effect is output to the operator terminal and the next terminal station.
- LOS loss of optical input
- FIG. 1 shows an example of a configuration of a conventional optical input break detection device in an optical transmission device.
- an optical signal transmitted from a counter station is transmitted to an optical transceiver 1 of the own station. Then, it is input to the data power clock 'data recovery unit (CDR: Clock & Data Recovery) 2 which has been converted to optical / electrical (OZE).
- CDR clock 'data recovery unit
- the optical transceiver 1 includes an optical output constant control unit and the like (not shown). If a signal below a predetermined optical input level is detected using an optical AGC control signal, etc., a serious failure (SF) will occur. Outputs the corresponding light input loss (LOS) alarm to the data processing unit 3.
- SF optical AGC control signal
- clock 'data recovery unit 2 the clock component included in the input data signal is extracted to recover the reception clock, and the input data is sampled by the extracted clock to recover the reception data of the opposite local power. To do. Clock 'Data and clock recovered by the data recovery unit 2 are both output to the data processing unit 3.
- the data processing unit 3 performs a decoding process on the received data to restore the source data.
- bit error rate (BER) of the received data is calculated and the communication line
- SD signal degradation
- the data processor 3 switches the data from the work system to the protect system and executes the alarm processing of the line abnormality, and the continuous data value “0” is transferred to the next stage. Output.
- FIG. 2 shows another configuration example of a conventional optical input break detection device.
- the asynchronous state indicating the asynchronous (free-running) state output by the PLL (Phase Locked loop) circuit etc. in the clock 'data regeneration unit 2 is lost.
- the (LOL: Loss of Lock) alarm is output to the data processor 3 in response to a severe failure (SF).
- SF severe failure
- Patent Document 1 JP 2001-339347 A
- Patent Document 2 JP-A-7-95156
- LOS in FIG 1 is set equal to the failure level and SF, for example SD is BER IE- 6 (10- 6), and LOS (SF) is the BER IE- 4 (10- 4) degree Is done.
- the conventional optical transino 1 uses the fact that a continuous signal with a data value of “0” is output when the optical input level falls below a predetermined level. 'A method was also used in which the LOL alarm was output as soon as the data playback unit 2 detected it.
- the optical transceiver 1 has a built-in amplifier associated with constant optical output control to improve reception sensitivity and extend the reception range, and the optical signal is a small signal with a noise level. Even if it exists, it has the structure where the data after amplification containing noise are output. For this reason, the conventional method (continuous zero detection) cannot be used in the next clock 'data recovery unit 2'.
- an object of the present invention is to monitor the input level of a received optical signal, and immediately detect a severe fault (SF) when the optical input level is higher than a predetermined level. If the level is less than or equal to the specified level, priority is given to detection of minor faults (SD), and detection of severe faults (SF) is allowed after detection, thereby enabling early SF detection based on the light input level and SD force SF. Therefore, it is desirable to provide an optical input break detection device that can ensure both the detection order and the detection order.
- SD minor faults
- SF severe faults
- an optical input unit that outputs received light power reduction information and an LOS alarm based on measurement of received light power of an optical input signal, and a synchronous clock included in the optical input signal are extracted,
- a synchronization unit that outputs a LOL alarm when out of synchronization and the presence or absence of the received light power drop information are determined. If there is, the LOS alarm is enabled by the output of the LOL alarm, and if not, the LOS alarm is output.
- a light input break detection device is provided which has a light input break detection unit that immediately activates and detects a light input break by the effective LOS alarm.
- the light input interruption detection unit is also configured to output the LOL alarm output if the light input interruption is present. Instead of enabling the LOS alarm, the LOL alarm output is regarded as a valid LOS alarm.
- the optical input break detection device further includes a BER measurement unit that measures the BER of the received data regenerated using the synchronous clock and determines an SD level failure state when the received data is equal to or higher than a predetermined BER value.
- the BER value in the SD level failure state is smaller than the BER value in the LOS level or LOL level failure state. Also, the BER value in the failure state of the LOS level or the LOL level is substantially equal to the BER value in the failure state of the SF level.
- the received light power reduction information is output after the elapse of a predetermined delay time or the force output at every predetermined period or the time force at which the information is acquired.
- an optical input disconnection is detected due to a serious failure caused by a device failure or line disconnection.
- LOS is detected immediately to satisfy the SF detection time within 100 ⁇ S of specification GR-253.
- the optical input level drops below the minimum reception level (with light reception power reduction information)
- the light reception level from the opposite station is usually sufficiently higher than the minimum reception level of the receiving station. It can be assumed that it has gradually occurred due to deterioration over time of the intra-station equipment and inter-station transmission path and changes in ambient temperature. Therefore, in the state where the optical input signal level is reduced, BER is measured during the continuous operation of the system to detect a minor failure (SD; BER IE—6) that allows the continuous operation of the system. Severe failure (LOL; BER IE-4) detected after failure (after SD detection).
- SD minor failure
- LOL BER IE-4
- FIG. 1 is a diagram showing a configuration example of a conventional light input break detection device.
- FIG. 2 is a diagram showing another configuration example of a conventional light input break detection device.
- FIG. 3 is a diagram showing a first embodiment of a light input break detection device according to the present invention.
- FIG. 4 is a diagram showing an example of a control flow of a LOS control unit.
- FIG. 5 is a diagram showing an example of a specific circuit configuration of a LOS control unit.
- FIG. 6 is a diagram showing an example (1) of the operation time chart of FIG.
- FIG. 7 is a diagram showing an example (2) of the operation time chart of FIG. 3.
- FIG. 8 is a view showing a second embodiment of the light input break detecting device according to the present invention.
- FIG. 9 is a diagram showing an example (1) of the operation time chart of FIG.
- FIG. 10 is a diagram showing an example (2) of the operation time chart of FIG.
- FIG. 3 shows a first embodiment of the optical input break detection device according to the present invention.
- the optical transceiver 1, the clock data recovery unit (CDR) 2, and the data processing unit 3 are the same as in the conventional example. Therefore, it will not be further described here. Due to the MSA of optical transceivers, the recent optical transceiver 1 has various monitoring functions such as optical output power, internal temperature, power supply voltage, etc., and Z or detection functions. In the present invention, the received light power monitoring function or the received light power alarm function is used for LOS detection.
- the LOS control unit 4 newly added in this example receives the light reception power drop information and the LOS alarm from the optical transceiver 1 and the LOL alarm from the clock / data recovery unit 2, Controls the passage of the LOS alarm to the optical transceiver 1 power data processing unit 3 based on the received light power reduction information and the LOL alarm.
- the data processing unit 3 executes the same processing as in the conventional example of FIG.
- the LOS control unit 4 performs LOS alarm or clock data recovery from the optical transceiver 1, both of which indicate a severe failure (BER IE—4), based on the received power reduction information from the optical transceiver 1. Either one of the LOL alarms from part 2 may be output (see Figure 5 below).
- the data processing unit 3 executes the same processing as the conventional example in FIG. 2 when the LOL alarm is given.
- FIG. 4 shows an example of the control flow of the LOS control unit 4.
- the LOS control unit 4 receives received light power drop information from optical transceiver 1 (in this example Monitors the light reception power drop alarm) and determines whether or not it is present (S01).
- the light reception power reduction alarm is output, for example, when the light reception power value measured at predetermined intervals or the average value thereof is less than the minimum light reception power guarantee value.
- the LOS alarm from the optical transceiver 1 is monitored to determine whether it is present (S03).
- an LOS alarm is detected (ON)
- it is output to the data processor 3 (S04).
- the process returns to the monitoring of the received light power reduction alarm (S01).
- the LOS control unit 4 outputs the input LOS alarm to the information processing unit 3 as it is. Can satisfy the specified value of 100 ⁇ S.
- the LOL alarm of the clock 'data reproduction unit 2 force is monitored to determine whether or not there is (S02). If an LOL alarm is detected (ON), the LOS alarm input from the optical transceiver 1 is passed and output to the information processing unit 3 (S04). If the LOL alarm is not detected (OFF), the process returns to the monitoring of the received power low alarm (S01).
- the LOS control unit 4 sets the condition for detecting the LOL alarm from the clock 'data recovery unit 2 (LOL The LOS alarm input after detection is output to the information processing unit 3. This protects the order of SD and LOS generation.
- FIG. 5 shows an example of a specific circuit configuration of the LOS control unit.
- the inverter 41 of the LOS control unit 4 receives the light reception power drop alarm from the optical transceiver 1, and the AND circuit 42 in the next stage receives the output of the inverter 41 and the LOS alarm from the optical transceiver 1. Entered. Therefore, the AND circuit 42 passes the LOS alarm from the optical transceiver 1 as it is when it does not detect the light reception power drop alarm (value “0”). On the other hand, if a light reception power drop alarm is detected (value "1”), the LOS alarm from optical transceiver 1 is prohibited.
- the received power reduction alarm from the optical transceiver 1 is input to one input of the AND circuit 43, and the LOL alarm from the clock data recovery unit 2 is input to the other input. It is powered. Accordingly, when the AND circuit 43 does not detect the light reception power reduction alarm (value “0”), the AND circuit 43 prohibits the passage of the LOL alarm from the clock data recovery unit 2. On the other hand, when a light reception power drop alarm is detected (value "1"), the LOL alarm from the clock data recovery unit 2 is passed as it is.
- the OR circuit 44 in the output stage outputs either the LOS alarm from the optical transceiver 1 or the LOL alarm from the clock data recovery unit 2 depending on the presence or absence of the received light power reduction alarm.
- the LOS and LOL failure levels are both equal to the SF failure level (BER IE-4), so the output alarms in the figure are shown as LOST alarms.
- the received light power is monitored by a received light power drop alarm from the optical transceiver 1 (it may be a received light level monitor signal), and if the received light power exceeds the minimum value guaranteed by the optical transmission device, the optical transceiver 1 Enables LOS monitoring based on the received light power, disables the LOS alarm based on the received light power below the minimum value of the received light power, and monitors the LOL alarm from the clock data recovery unit 2.
- a received light power drop alarm from the optical transceiver 1 it may be a received light level monitor signal
- the optical transceiver 1 Enables LOS monitoring based on the received light power, disables the LOS alarm based on the received light power below the minimum value of the received light power, and monitors the LOL alarm from the clock data recovery unit 2.
- LOS detection can be performed within 100 S from the interruption of optical input within the range of received light power guaranteed by the optical transmission apparatus.
- the SD force can also follow the LOS failure order by considering LOS detection by the LOL alarm output after SD detection using BER.
- FIG. 6 and 7 show examples of operation time charts of the optical input break detection device according to the present invention.
- Fig. 6 shows an example when the received light power is larger than the minimum light receiving threshold value guaranteed by the light input break detection device
- Fig. 7 shows the minimum received light power value guaranteed by the light input break detection device. An example of each case is shown below.
- Fig. 6 shows a severe failure (SF) caused by sudden fiber cable disconnection or the like when an optical signal with a received light power sufficiently larger than the minimum received power is input as shown in Fig. 6 (a). Shows an example of the operation when the optical input power becomes zero.
- the received light power drop alarm output from the optical transceiver 1 is the received power value measured every cycle of several mS—several tens of mS, the average value thereof, and the minimum received power value (of Fig. 7 (a)).
- Light output power threshold The force is also delayed in the order of mS by the predetermined period ((b) in FIG. 6).
- the LOS control unit 4 determines that an optical signal of a light receiving part larger than the minimum light receiving power is being input until this light receiving power drop alarm is output.
- the output power delay alarm output line (41 input in Fig. 4) is delayed by about lms by adding a capacitive element, for example, during which the received power as shown in Fig. 6 (a) is delayed. Let's make sure that the LO S alarm is output by detecting the instantaneous fluctuation of the ⁇ (see 42 in Fig. 5).
- the LOS alarm output from the optical transceiver 1 is detected by a simple comparison between the optical input power and the LOS threshold value of the received light power (see (a) in FIG. 7). For this reason, the LOS alarm is output almost simultaneously with the light input interruption as shown in Fig. 6 (c). In this example, the LOL alarm from the clock / data recovery unit 2 shown in Fig. 6 (d) is ignored.
- the received light power is larger than the minimum received power
- the LOS alarm from the optical transceiver 1 passes through the LOS control unit 4 and is output to the data processing unit 3 as shown in Fig. 6 (e).
- the data processing unit 3 starts alarm processing immediately. Therefore, as shown in the figure, if the LOS alarm is used, 100 S, which is the regulation of SF detection time (T), can be sufficiently satisfied.
- Fig. 7 shows that the optical input power is gradually reduced due to aging of the inter-station equipment and the transmission line and changes in the ambient temperature (Fig. 7 (a)).
- An example of the operation when the power alarm threshold is lower than the LOS threshold of the received power is shown.
- an optical input signal with a received light power greater than the received light power alarm threshold can be received without error
- an optical input signal with a received light power smaller than the LOS threshold for received light power cannot be received
- An optical input signal with a received power between the alarm threshold and the received power LOS threshold can receive a BER level (SD) that allows the current system to continue operation.
- SD BER level
- an optical signal having a light reception power intermediate between the light reception power alarm threshold value and the LOS threshold value of the light reception power at the start of operation is targeted. For this reason, as in the case of Fig. 6, severe faults (SF) that do not need to consider intermediate received light power from the beginning due to line disconnection etc. are excluded from this example.
- SF severe faults
- the optical transceiver 1 outputs a LOS alarm when the light reception power of the optical input signal falls below the LOS threshold of the light reception power ((c) in FIG. 7).
- the data processing unit 3 repeatedly calculates the BER, and when the BER power E-6 is reached, the reception state is determined as the SD level and the information is recorded.
- the LOS control unit 4 detects the LOL alarm from the clock / data reproduction unit 2 when the BER is in the vicinity of IE-4 ((d) in FIG. 7).
- the LOS control unit 4 outputs the LOS alarm from the optical transceiver 1 present at the time of detecting the LOL alarm or the detected LOL alarm to the data processing unit 3 as a LOS alarm (Fig. 7 (e)).
- the data processing unit 3 starts severe fault processing (SF).
- SF severe fault processing
- FIG. 8-10 shows a second embodiment of the optical input break detection device according to the present invention.
- the difference between the first embodiment shown in FIG. 3 and FIG. 8 is that in FIG. 3, the LOL alarm force output from the PLL circuit of the clock data recovery unit 2 is output to the S control unit 4.
- the data processing unit 3 obtains the BER level IE-4 equivalent to the LOL alarm shown in Fig. 3 by software operation in the same way as SD, and uses the LOS control as a bit error error alarm instead of the LOL alarm. This is the point that is output to part 4. The rest is the same as the first embodiment.
- FIGS. 9 and 10 showing the operation example of the second embodiment
- (d) in FIG. 9 is the bit “error” alarm of the data processing unit
- an optical input interruption (LOS) is immediately generated, and when the optical input power is equal to or lower than the minimum reception level, the SD force LOS can be generated in this order.
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PCT/JP2005/001850 WO2006085356A1 (ja) | 2005-02-08 | 2005-02-08 | 光入力断検出装置 |
CN200580047915.7A CN101116267B (zh) | 2005-02-08 | 2005-02-08 | 光输入中断检测装置 |
JP2007502499A JP4528827B2 (ja) | 2005-02-08 | 2005-02-08 | 光入力断検出装置 |
US11/889,051 US7684700B2 (en) | 2005-02-08 | 2007-08-08 | Loss-of-signal detecting device |
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PCT/JP2005/001850 WO2006085356A1 (ja) | 2005-02-08 | 2005-02-08 | 光入力断検出装置 |
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US11/889,051 Continuation US7684700B2 (en) | 2005-02-08 | 2007-08-08 | Loss-of-signal detecting device |
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US7486894B2 (en) * | 2002-06-25 | 2009-02-03 | Finisar Corporation | Transceiver module and integrated circuit with dual eye openers |
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2005
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- 2005-02-08 CN CN200580047915.7A patent/CN101116267B/zh not_active Expired - Fee Related
- 2005-02-08 WO PCT/JP2005/001850 patent/WO2006085356A1/ja not_active Application Discontinuation
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2007
- 2007-08-08 US US11/889,051 patent/US7684700B2/en not_active Expired - Fee Related
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JP2002044035A (ja) * | 2000-07-21 | 2002-02-08 | Sumitomo Electric Ind Ltd | 波長多重分割伝送方法およびそのシステム |
JP2002141874A (ja) * | 2000-11-01 | 2002-05-17 | Nec Corp | 信号断検出装置 |
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Cited By (6)
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WO2008128462A1 (fr) * | 2007-04-18 | 2008-10-30 | Huawei Technologies Co., Ltd. | Procédé, système et appareil de détection de défaut pour un réseau réparti optique |
JP2011023793A (ja) * | 2009-07-13 | 2011-02-03 | Oki Electric Industry Co Ltd | 加入者端末、光通信ネットワーク及び光通信ネットワークにおける光信号の強度調整方法 |
JP2015233281A (ja) * | 2014-06-09 | 2015-12-24 | 株式会社ユービークオス | 予備ポートで予備幹線回線の受信光信号強度測定可能なポット二重化光回線終端装置(olt)、パッシブ光ネットワーク(pon)システム、及びそれを用いた予備幹線回線の安定性判断 |
CN104093156A (zh) * | 2014-07-24 | 2014-10-08 | 京信通信***(中国)有限公司 | 分布式基站***的从站设备地址分配方法和*** |
CN104093156B (zh) * | 2014-07-24 | 2017-11-14 | 京信通信***(中国)有限公司 | 分布式基站***的从站设备地址分配方法和*** |
WO2019167361A1 (ja) * | 2018-02-27 | 2019-09-06 | 日本電気株式会社 | 光信号受信装置、光信号受信方法、及び非一時的なコンピュータ可読媒体 |
Also Published As
Publication number | Publication date |
---|---|
US20070280684A1 (en) | 2007-12-06 |
CN101116267A (zh) | 2008-01-30 |
JPWO2006085356A1 (ja) | 2008-06-26 |
US7684700B2 (en) | 2010-03-23 |
JP4528827B2 (ja) | 2010-08-25 |
CN101116267B (zh) | 2010-09-08 |
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