WO2005086400A1 - 光伝送装置 - Google Patents
光伝送装置 Download PDFInfo
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- WO2005086400A1 WO2005086400A1 PCT/JP2004/002775 JP2004002775W WO2005086400A1 WO 2005086400 A1 WO2005086400 A1 WO 2005086400A1 JP 2004002775 W JP2004002775 W JP 2004002775W WO 2005086400 A1 WO2005086400 A1 WO 2005086400A1
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- signal
- branch
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- wdm
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- 230000003287 optical effect Effects 0.000 title claims abstract description 533
- 230000001934 delay Effects 0.000 claims abstract description 7
- 230000005540 biological transmission Effects 0.000 claims description 80
- 230000003111 delayed effect Effects 0.000 claims description 56
- 238000006243 chemical reaction Methods 0.000 claims description 23
- 238000004891 communication Methods 0.000 claims description 22
- 239000013307 optical fiber Substances 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims 4
- 241001417902 Mallotus villosus Species 0.000 claims 1
- 230000003321 amplification Effects 0.000 claims 1
- 238000003199 nucleic acid amplification method Methods 0.000 claims 1
- 230000008602 contraction Effects 0.000 abstract 3
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 26
- 238000005516 engineering process Methods 0.000 description 5
- 230000008033 biological extinction Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/299—Signal waveform processing, e.g. reshaping or retiming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0238—Wavelength allocation for communications one-to-many, e.g. multicasting wavelengths
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
- H04J14/0246—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU using one wavelength per ONU
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0283—WDM ring architectures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0278—WDM optical network architectures
- H04J14/0284—WDM mesh architectures
Definitions
- the present invention relates to an optical transmission device, and more particularly, to an optical transmission device that transmits an optical signal pulse.
- WDM Wavelength Division Multiplex
- FIG. 14 is a diagram showing the configuration of a WDM system.
- the system 200 includes an optical transmission unit 210 and an optical reception unit 220.
- the optical transmission unit 210 includes a transponder 211-11-211-n, an ATT (optical attenuator) 212-1 to 212-n, a MUX unit 213, and an optical amplifier 214.
- the optical receiving unit 220 includes an optical pump 221, a DMUX unit 222, and transbonders 223-1 to 223-n.
- the transbonders 21 1 1 to 211_n are installed corresponding to the wavelengths ⁇ 1 to ⁇ n, respectively, so that the wavelength band of the input optical signal is narrow band suitable for WDM. ) And output.
- the ATTs 212-1 to 2 12-11 adjust the wavelengths ⁇ 1 to ⁇ n to a certain level of optical power and transmit the adjusted power to the MUX unit 213 which performs the subsequent multiplex processing.
- the MUX unit 213 multiplexes the wavelengths I 1 to ⁇ to generate a WDM signal (wavelength multiplexed signal), and the optical amplifier 214 amplifies the WDM signal and outputs it to the optical transmission path.
- the optical amplifier 221 receives the WDM signal flowing through the optical transmission line and amplifies the WDM signal with respect to the optical receiving unit 220.
- DMUX section 222 separates the WDM signal for each of wavelengths ⁇ 1 to ⁇ .
- Each of the transbonders 223-1 to 223- ⁇ is installed corresponding to the wavelength ⁇ 1 to ⁇ , and the separated narrow-band optical signal is converted into a wave suitable for the user's equipment. Convert to long band and output.
- the above-mentioned transponder for converting the interface between the user equipment and the WDM is required for the number of wavelengths that can be accommodated in the WDM system, and conventionally, the number corresponding to the type of line speed accommodated in the WDM system. Minutes, I had to prepare a transbonder. _
- the transbonders 211-1 to 211-n and the transbonders 223 _ 1 to 223-n also correspond to the respective line speeds.
- the transponder on the transmitting side will support 60 OMb / s.
- 2n transponders are required for n wavelengths of ⁇ 1 to ⁇ n and 2.4Gb Zs-compatible transbonders for n wavelengths of ⁇ 1 to ⁇ n.
- the receiving side requires 2 n transponders, and a total of 4 n transbonders must be prepared.
- the number of transbonders increases in accordance with not only the number of wavelengths but also the line speed, and a great deal of labor is required for system maintenance and management every time a function is added.
- the wavelength of the input optical signal is independent of the transmission line speed such as SDH (Synchronous Digital Hierarchy), ZSONE T (Synchronous Optical Network) and GbE (Gigabit Ethernet is a registered trademark).
- Bit-free transponders that can convert the bandwidth are developed. By using such a bit-free transbonder, it is not necessary to have as many substrates as the number corresponding to the line speed, and it is sufficient to have as many substrates as the number of wavelengths.
- a single bit-free transponder can accommodate 600 Mb / s or 2.4 Gb / s springs, so it is only necessary to provide a bit-free and transbonder for the number of wavelengths. ).
- there will be no limit on the line speed of the signal sent from the user so the communication price initially contracted will be removed. Some control is needed to maintain the case.
- Patent Document 1 As a conventional technology for limiting the signal from the user, a technology is proposed in which the user LAN is connected to the wide area LAN of the carrier through an optical fiber transmission line, and the data amount is limited according to the contracted bandwidth with the user. (For example, Patent Document 1).
- Patent Document 1
- JP-A-2002-94574 (paragraph numbers [0009] to [0030], FIG. 1)
- bit-free transbonder eliminates the need to replace boards or perform evaluations every time the line speed changes, which is efficient for the maintenance management side. Good system management becomes possible.
- the bandwidth conversion processing power S can be achieved without depending on the line speed, so even if the contract with the user is 60 OMbZs, there is no relation to the line speed at the time of contract.
- the communication function of the system can pass higher-speed signals such as 2.4 GbZs.
- the present invention has been made in view of such a point, and when a regenerative repeater such as a bit-free trans-bonder is used, the line speed of a signal sent from a user is efficiently restricted to improve the system operation. It is an object of the present invention to provide an optical transmission device with improved reliability.
- an optical transmission device 10 for transmitting an optical signal an input port 11 for inputting an optical signal flowing through a line, an optical signal
- An optical branching unit 12a that branches the optical signal into two, a through-branch line Lt that passes through the optical signal branched to one side and transmits as a through-branch optical signal, and an optical signal branched to the other side is set.
- An optical multiplexed sound that generates an optical multiplexed signal by multiplexing a delay branch line Ld that is delayed by the delay amount and transmitted as a delayed optical split signal, and a sliver optical split signal and a delayed optical split signal 15 1 2 b
- an optical multiplexed signal that meets the pulse mask specification of the optical signal to be passed is generated, and the contracted line speed is reduced.
- a line speed limiter that limits the acceptance of the line speed of an input optical signal by setting the amount of delay for generating an optical multiplexed signal that does not satisfy the pulse mask specification of the optical signal to be rejected 1 2.
- the input port 11 receives an optical signal flowing through the line.
- the optical splitter 12a splits the optical signal into two.
- the through-branch line Lt passes the optical signal branched to one side through and transmits it as a through optical branch signal.
- the delay branch line L d delays the optical signal branched to the other side by a set delay amount, and Send as
- the optical multiplexing unit 12b multiplexes the through optical branch signal and the delayed optical branch signal to generate an optical multiplexed signal.
- the line speed limiting unit 12 includes an optical branching unit 12a, a through-branch line Lt, a delay branching line Ld, and an optical multiplexing unit 12b.
- an optical multiplexed signal that satisfies the pulse mask specification of the optical signal to be passed is generated, and for optical signals that are rejected that exceed the contracted line speed, pulse masks for optical signals that are rejected
- the amount of delay for generating an optical multiplexed signal that does not satisfy the requirements of is limited.
- FIG. 1 is a principle diagram of the optical transmission device of the present invention.
- FIG. 2 is a diagram for explaining a pulse mask.
- A shows a square wave
- B shows a waveform that satisfies the pulse mask specification
- C shows a waveform that does not satisfy the pulse mask specification.
- FIG. 3 is a diagram illustrating a configuration of the optical transmission device according to the first embodiment.
- FIG. 4 is a diagram showing the correspondence between the line speed and the pulse period for each signal type.
- FIG. 5 is a diagram illustrating the length of an optical fiber required to delay one cycle for each signal type.
- FIG. 6 is a time chart showing an STM-16 multiplexed signal in which a pulse mask collapse has occurred.
- FIG. 7 is a time chart showing a combined signal of STM-4 that does not cause pulse mask collapse.
- FIG. 8 is a diagram illustrating a configuration of the optical transmission device according to the second embodiment.
- FIG. 9 is a diagram illustrating a configuration of a WDM system including an optical transmission device.
- FIG. 10 is a diagram showing a configuration of a bit-free transbonder.
- FIG. 11 is a diagram showing a configuration of a ⁇ -VPN system.
- FIG. 12 is a diagram showing a configuration of the ⁇ -VPN system.
- FIG. 13 is a diagram showing a configuration of a ⁇ -VPN system.
- FIG. 14 is a diagram showing the configuration of the WDM system. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 is a diagram illustrating the principle of an optical transmission device according to the present invention.
- the optical transmission device 10 is a device that includes an input port 11, a line speed limiter 12, and an output port 13, and transmits an optical signal.
- the input port 11 receives an optical signal flowing through the line.
- the output port 13 outputs an optical signal processed in the device onto a transmission line.
- the line speed limiting unit 12 includes an optical branching unit 12a, an optical multiplexing unit 12b, a through branch line Lt, and a delay branch line Ld.
- the optical branching unit 12a branches the input optical signal into two, outputs one to the through branch line Lt, and outputs the other to the delay branch line Ld.
- the through-branch line Lt passes the optical signal branched to one side through and transmits it as a through-branch optical branch signal.
- the delay branch line Ld delays the optical signal branched to the other side by a set delay amount and transmits it as a delayed optical branch signal.
- the optical multiplexing unit 12b multiplexes the through optical branch signal and the delayed optical branch signal to generate an optical multiplexed signal.
- the delay branching line Ld A predetermined delay is set in advance to control the acceptance of the line speed.
- Optical multiplexed signal that satisfies the requirements described in (2) below, and for optical signals subject to acceptance rejection that exceed the contracted line speed, optical multiplexing signals that do not meet the pulse mask specifications for the optical signal subject to rejection.
- Set the amount of delay so that a wave signal is generated. This limits the acceptance of the line speed of the input optical signal.
- the vertical axis of the optical waveform shown in the figure is the light intensity, and the horizontal axis is the time.
- Line speed limiter 1 to 2 The input optical signal is branched by the optical branching unit 12a into a through branch line Lt and a delay branch line Ld.
- the optical signal passing through the optical path of the through branch line Lt is directly input to the optical multiplexing unit 12b.
- the optical signal passing through the optical path of the delay branch line Ld is input to the optical multiplexing unit 12b with a delay of a set time. Since the through-one optical branch signal and the delayed optical branch signal are signals after being branched into two by the optical branching unit 12a, the optical intensity is half the optical intensity of the original input optical signal.
- the optical multiplexing unit 12b multiplexes the through optical branch signal and the delayed optical branch signal having a slight difference in the phase (not the optical wave phase but the optical pulse phase) generated by the set delay amount. At the arrival of the optical multiplexing unit 12b, if the signal intensities of both the through optical branch signal and the delayed optical branch signal are in the light emitting state, the signal of the multiplexed output is in the light emitting state representing logic "1".
- the multiplexed output signal indicates the logical "0". become.
- the signal intensity of the through optical branching signal and the delayed optical branching signal differ at the arrival of the optical multiplexing unit 12b (one signal emits light and the other signal extinguishes), it is set to logic "0". It becomes an indeterminate state that cannot be determined to be "1” or "1", and the light intensity is just halfway between the emission and extinction.
- the line speed at the time of the initial contract with the user is assumed to be S p 1
- the delay branch line L d is set to the delay amount d
- optical signals having a line speed of S p 1 or less are accepted
- the line speed SP 1 is assumed to be Consider a case in which the acceptance of an optical signal exceeding this is rejected.
- the input optical waveform S1 is a waveform of an optical signal having a line speed Spl at the input point of the optical branching unit 12a. It is assumed that the pulse mask of the optical signal having the line speed S p 1 is M 1.
- the through optical waveform S 1 a is a waveform of the through optical branch signal at the input point of the optical multiplexing unit 12 b after passing through the through-branch line L t at the line speed S p 1, and the delayed optical waveform S 1 b is FIG. 9 shows the waveform of a delayed optical split signal having a line speed Sp 1 at the input point of the optical multiplexing unit 12 b delayed by the delay amount d after passing through the delay branch line L d.
- the multiplexed waveform S 1 c is the optical multiplexed signal of the line speed S p 1 at the output point of the optical multiplexing unit 12 b after multiplexing the through optical waveform S 1 a and the delayed optical waveform S 1 b. It is a waveform.
- the combined waveform S 1 c is delayed from the through-light waveform S 1 a by the delay amount d.
- a step-like waveform including logic “0”, “1”, and undefined state is obtained.
- the pulse mask Ml satisfies the stipulation for the combined waveform S1 having a stepped waveform (that is, the combined waveform Sic is the optical signal of the line speed Spi).
- the signal transmission margin (margin) specified by the pulse mask Ml must be satisfied), and the optical signal with the line speed Sp1 is accepted as a signal within the contract range.
- the input optical waveform S2 is the waveform of the optical signal having the line speed Sp2 at the input point of the optical branching unit 12a.
- the pulse mask of the optical signal having the line speed Sp2 is assumed to be M2.
- the through-beam optical signal S 2 a is a through-beam optical signal S 2 at the input point of the optical multiplexing unit 12 b after passing through the through-branch line Lt, and is a delayed optical waveform S 2 2b is the waveform of the delayed optical split signal having the line speed Sp2 at the input point of the optical multiplexing unit 12b, which is delayed by the delay amount d after passing through the delay branch line d.
- the multiplexed waveform S 2 c is the optical multiplex of the line speed S p 2 at the output point of the optical multiplexing unit 12 b after the through optical waveform S 2 a and the delayed optical waveform S 2 b are multiplexed. This is the waveform of the wave signal.
- the multiplexed waveform S 2 c is combined with the sley optical waveform S 2 a and the delayed optical waveform S 2 b delayed by the delay amount d to form a stepped waveform.
- Lus mask M 2 is cut off from the combined waveform S 2 c of the stepped waveform (the combined waveform S 2 c is applied to the inside of the palace mask M 2).
- the combined waveform S 2 c does not satisfy the signal transmission margin (margin) specified by the pulse mask M 2 of the optical signal having the line speed Sp 2), and the light having the line speed Sp 2
- the signal will be rejected as a signal with a speed beyond the contract.
- the signal pulse that exceeds the permitted speed can be used as a pulse mask. And the pulse mask will not stop, so the line speed can be limited.
- the combined signal removes or eliminates the noise mask in the optical transmission device 10 is determined. It is also possible to provide a pulse mask determination unit to determine that the combined signal is cut off in the device if the combined signal determines that the pulse mask is removed. Even if it is transmitted to the subsequent stage of the optical signal power that does not satisfy the mask, an error will occur in the system or the user equipment itself, so that communication will be impossible.) If it is determined that the condition does not satisfy the noise mask, an alarm may be issued on the assumption that a high-speed optical signal that violates the contract has been input.
- FIG. 2 is a diagram for explaining a pulse mask.
- A shows a square wave
- B shows a waveform that satisfies the pulse mask specification
- C shows a waveform that does not satisfy the pulse mask specification.
- the light emitting state is represented by logic "1” and the light quenching state is represented by logic "0".
- This light pulse instantaneously switches between light emission and extinction in the ideal stigma, and its waveform becomes a square wave as shown in (A) (the rise and fall times of light emission and extinction are zero).
- the waveform has a certain slope as shown in (B) and (C). Such rise and fall times exist).
- the pulse mask defines the width of this receivable waveform on the receiver side.
- light pulses wider than pulse mask M can be transmitted, and light pulses narrower than pulse mask M, as shown in (C), cannot be transmitted because they do not meet the standard.
- the specified value of the mask for example, the parameters that specify the pulse mask of the optical signal of OC (Optical Carrier) — 3 and ⁇ C-112 are specified in GR — 25 3 — CORE. Book).
- FIG. 3 is a diagram illustrating a configuration of the optical transmission device according to the first embodiment.
- the symbols A to D are used in the description of FIG. 6 and FIG.
- the optical transmission device 10-1 of the first embodiment includes an input port 11, a line speed limiter 12-1 and an output port 13.
- the line speed limiting unit 12-1 is composed of an optical branching unit, 3 dB couplers 12a and 12b corresponding to optical multiplexing ⁇ 15, a through branch line Lt, and a delay branch line Ld. .
- the 3dB power bras 12a and 12b are cord patched (Cord Patch: connecting the components with a cable) by a through branch line Lt and a delay branch line Ld.
- the through branch line Lt and the delay branch line Ld are optical fiber cables, and the delay branch line Ld requires a longer cable length than the through branch line Lt to generate a required amount of delay. It has been long.
- the optical signal that enters from the input port 11 is split by the 3 dB splitter 12a.
- One of the branched optical signals passes through the optical path of the through-branch line Lt and reaches the multiplexing 3 dB power blur 12 b as it is.
- the other optical signal W is delayed through the optical path of the delay branch line Ld, which is longer than the optical path length of the through branch line Lt, to reach the 3 dB power combiner 12b.
- the multiplexing 3 dB power bra 12b multiplexes these two signals having a phase difference.
- the pulse mask should not be destroyed for optical signals that pass through the line speed of the input optical signal that is lower than the contracted line speed, and for optical signals that are subject to rejection that exceed the contracted line speed.
- the optical path difference is determined by adjusting the cable length difference between the through branch line Lt and the delay branch line Ld so that the delay amount breaks the pulse mask. (The cable length of the through branch line Lt is The cable length of the delay branch line Ld can be variably adjusted by fixing the cable.)
- FIG. 4 is a diagram showing the correspondence between the line speed and the pulse frequency for each signal type.
- Table T1 shows typical line speed (Mb / s) and signal pulse period (ns) for each signal type of SDH (SONET).
- STM Sechronous Transport Module
- ⁇ C-12 is supported as optical frame of SONET
- line speed is 622.08Mb / s (hereafter referred to as 60 OMbZs)
- pulse The period is 1.6 ns.
- the STM-16 (OC-48) has a line speed of 24 88.32 MbZs (hereinafter referred to as 2.4 GbZs) and a pulse period of 0.4 ns.
- FIG. 5 is a diagram showing the length of an optical fiber required to delay one cycle for each signal type.
- Table T 2 is for each signal type of SDH (SONET). The length of the optical fiber required to delay one cycle is shown.
- STM-4 has a pulse period of 1.6 ns in table T1. To delay one period of 1.6 ns, pass an optical fiber 32 cm long from table T2. It has been shown to be good.
- the combined signals will be combined.
- the pulse mask of the multiplexed signal at the time of the destruction depends on the pulse mask, however, it is assumed that the pulse mask is deviated by a 1Z4 cycle shift.
- the S TM-4 passes through the S TM -Consider the case of creating a line speed limiter 12-1 that does not pass through 16.
- STM-4 deviates by one cycle (1.6 ns) from the table T2 with a cable length of 32 cm.
- the STM-4 optical signal with a line speed of 60 OMb / s can be serviced.
- STM-16 optical signals with a line speed of 2.4 GbZs can be rejected as service unavailable.
- FIG. 6 is a time chart showing a multiplexed signal of STM-16 in which the pulse mask collapsed.
- STM—16 (2.4 Gb) at points A to D in the configuration diagram shown in Fig. 3 Zs) is shown.
- the waveform at point A is the signal before branching
- the waveform at point B is the through optical branch signal at the time of multiplexing input
- the waveform at point C is the delayed optical branching signal at the time of multiplexing input
- the waveform at point D is the multiplexed signal. .
- the pulse mask of STM-16 be Ma. Since the cable difference between the souffle branch line Lt and the delay branch line Ld is 2 cm, the phase difference between the through optical branch signal and the delayed optical branch signal is 0.1 Ins. In the case of STM-16, with a phase difference of 14 ns with a phase difference of 0.1 ns, in the case of STM-16, the through optical branch signal and the delayed optical branch signal;
- FIG. 7 is a time chart showing a combined signal of STM-4 which does not cause pulse mask collapse.
- 4 shows STM-4 (600 Mb / s) waveforms at points A to D in the configuration diagram shown in FIG.
- the pulse mask of STM-4 be Mb.
- the cable difference between the through branch line Lt and the delay branch line Ld is 2 cm, and the phase difference between the through optical branch signal and the delayed optical branch signal is 0.1 Ins. Since the phase difference 0. Ins is shifted by 1/8 cycle in the case of STM-4, the combined signal generated by combining the through-one optical branch signal and the delayed optical branch signal is stored in the pulse mask Mb. It satisfies the requirements of pulse mask Mb.
- FIG. 8 is a diagram illustrating a configuration of an optical transmission device according to the second embodiment.
- the optical transmission device 102 of the second embodiment includes an input port 11, a line speed limiter 12-2, and an output port 13.
- the line speed limiting unit 12-2 includes 3 dB power mirrors 12a and 12b corresponding to the optical branching unit and the optical multiplexing unit, the switch control unit 12c, the switch units SW1 to SWn, and the through branch line.
- the points different from the configuration shown in FIG. 3 are the switch control wholesaler 12c, the switches SW1 to SWn, and the n delay branch lines Ld1 to Ldn. Therefore, these components will be described.
- the switch units SWl to SWn control the switch ONZOFF based on the designated signal transmitted from the switch control unit 12c. When the corresponding switch turns ON, the delay Branch line, one line is selected from dl to Ldn, 3 dB coupler for branch 1
- the delayed optical branch signal output from a flows through the selected delay branch line for multiplexing.
- the delay branch line Ld2 is selected, and the delayed optical branch signal output from the branching 3 dB power bra 12a flows through the delay branch line Ld2 and is coupled to the branching line Ld2. Reach dB force bra 12b.
- the lengths of the delay branch lines Ld1 to LdnO cable are adjusted in consideration of the optical path when the optical signal passes through the switch.
- STM—4 or less is accepted, STM—4 or more STM—16, 6 4 is rejected, and STM—1 or less is accepted, STM—1 or more STM—4, 16, 64 Consider creating a line speed limiter 12-2 that can refuse acceptance.
- the optical path difference should be 2 cm as described above.
- the optical path with the delay branch line Ld1 is adjusted so as to have an optical path difference of 2 cm from the optical path of the through branch line Lt.
- STM-4 In order to pass STTM-1 and below, but not STM-4, 16, and 64 that exceed STM-1, from Table T2, STM-4 has a cape length of 32 cm. It can be seen that the optical path of the through branch line Lt is 8 cm (D optical path difference) with respect to the optical path of the through branch line Lt. As a result, the phase of the two optical signals at the time of multiplexing is shifted by 1/4 cycle (delay of 0.4 ns from table T1), and the 3 dB coupler for multiplexing 12 b Input, the pulse mask of STM-4 and signals exceeding this speed can be broken.
- the switch units SWl to SWn flexibly select the delay branch line having a required delay amount from the delay branch lines Ld1 to Ldn, thereby flexibly. It becomes possible to control the line speed.
- a branching power bra is arranged at the output part of the multiplexing 3 dB power bra 12 and the multiplexing 3 dB branched by the power bra. It may be configured to include a monitor port that can monitor the combined output signal of the dB power blur 12b. With such a configuration, the operator can observe the multiplexed signal in the in-service state, so that the relationship between the multiplexed signal and the pulse mask can be confirmed.
- FIG. 9 is a diagram showing a configuration of a WDM system including the optical transmission device 10.
- the optical transmission unit 110 includes a transbonder (bit free; transbonder) 111—1 to: Lll—n, ATT1 12_1 to 1 12—n, a MUX unit 113, and an optical amplifier 114.
- the optical receiving unit 12 O includes an optical amplifier 121, a DMUX unit 122, and a transbonder (bit-free transbonder) 123-1 to 123 -n. The operation of each component has been described above with reference to FIG.
- the optical transmission device 10 of the present invention for limiting the line speed may be installed at any of Al to An, Bl to Bn, Cl to Cn, and D1 to Dn in the figure. If n optical transmission devices 10 each corresponding to one wave are arranged in Al to An, there is no need to arrange them in B1 to Bn, C1 to Cn, and D1 to Dn.
- all wavelengths used in WDM are placed on E i3 ⁇ 4 on the optical transmission line on which the WDM signal multiplexed between the optical transmitting unit 110 and the optical receiving unit 120 flows (that is, on the optical transmission line connecting the stations).
- One optical transmission device 10 capable of coping with the above may be arranged. With this arrangement, it is possible to limit the line speed of the WDM signal collectively.) ⁇
- FIG. 10 is a diagram showing a configuration of a bit-free transmission bonder.
- the bit-free transbonder 20 includes a wavelength band conversion unit 21 and And an optical transmission device 10.
- the wavelength band conversion unit 21 performs wavelength band conversion without depending on the line speed of the input light ⁇ ", and if the input optical signal is transmitted from the user side, a narrow band suitable for WDM. If the optical signal is a narrow band signal of WDM, it is converted to a wavelength band suitable for the user equipment and output.
- the reception and control of the line speed of the optical signal are performed, and the configuration and operation of the optical transmission device 10 have been described above, and a description thereof will be omitted. However, a configuration may be adopted in which the multiplexed signal after the line speed limiting process is band-converted after being disposed downstream of the optical transmission device 10.
- the configuration is such that the optical transmission device 10 is included in the bit-free transbonder, and the transbonders 1111-11 to L111-1n and 1223-1 to 123-n shown in FIG. If used, the size of the device can be reduced.
- a VPN Virtual Private Network
- ⁇ -VPN Virtual Private Network
- FIG. 11 is a diagram showing a configuration of the ⁇ -VPN system.
- the ⁇ -VPN system 3-1 comprises a network 30-1 and user terminals 3a to 3d, and the network 30-1F3 ⁇ 4 includes WDM devices 31 to 34 as access line terminating devices.
- the user terminal 3a is connected to the WDM device 31 via three C access lines al to a3 to which wavelengths ⁇ 1, ⁇ 5, and ⁇ 6 are assigned.
- the user terminal 3b is connected to the WDM device 32 via three access lines a4 to a6 to which wavelengths ⁇ 1, ⁇ 2, and ⁇ 3 are assigned.
- the user terminal 3c connects to the WDM device 33 via three access lines a7 to a9 assigned wavelengths of ⁇ 3, ⁇ 4, and ⁇ 6.
- the user terminal 3d is connected to the WDM device 34 via three access lines a10 to a12 assigned lengths of ⁇ 4, ⁇ 5, and ⁇ 6.
- the WDM device 31 is assigned a wavelength of ⁇ 1.
- WDM device 3 2 via backbone line b 1 and connected to WDM device 3 3 via backbone line b 2 to which wavelength ⁇ 6 was damaged.
- WDM device 34 via the assigned backbone line b3.
- the WDM device 32 is connected to the WDM device 34 via the backbone line b 6 to which the wavelength of ⁇ 2 is allocated, and is connected to the WDM device 33 via the backbone line b 5 to which the wavelength of ⁇ 3 is allocated.
- the WDM device 33 is connected to the WDM device 34 via the backbone line b4 to which the wavelength of 4 is assigned.
- an optical transmission device effective for one line is placed on all of the access lines a1 to a12 connecting the WDM device and the user terminal (for example, the wavelength ⁇ 1 is placed on the access line a1).
- An optical transmission device for limiting the line is placed).
- an effective optical transmission device for one line is placed on the backbone lines bl to b6 (for example, an optical transmission device that limits the line of wavelength ⁇ 1 is placed on the backbone line b1).
- an optical transmission device that limits the line speed collectively corresponding to all the wavelengths of the WDM may be arranged.
- FIG. 12 is a diagram showing the configuration of a ⁇ -VPN system.
- the ⁇ -VPN system 3-2 is a system that multicasts information and receives only data addressed to itself on the receiving side.
- the ⁇ -VPN system 3-2 is composed of a network 30-2 and user terminals 3a to 3d, and the network 30-2 includes WDM devices 31 to 34 as access line terminating devices. .
- the user terminal 3a is connected to the WDM device 31 via two access lines a1 and a2 to which wavelengths ⁇ 1 and ⁇ 4 are assigned.
- the user terminal 3 b is connected to the WDM device 32 via two access lines a 3 and a 4 to which wavelengths of ⁇ 1 and ⁇ 2 are assigned.
- the user terminal 3c is connected to the WDM device 33 via two access lines a5 and a6 to which wavelengths ⁇ 2 and ⁇ 3 are assigned. It is connected to the WDM device 34 via two access lines a7 and a8 to which the wavelengths of the user terminals 3c, ⁇ 3 and ⁇ 4 are assigned.
- the WDM device 31 is assigned a wavelength of ⁇ 1. It is connected to the WDM device 32 via the backbone line b1, and connected to the WD3 device 34 via the backbone line b2 to which the wavelength of ⁇ 3 is assigned.
- the WDM device 33 is connected to the WDM device 32 via the back line b 3 to which the wavelength of ⁇ 2 is assigned, and is connected to the WDM device 32 via the knock bone line b 4 to which the wavelength of ⁇ 4 is assigned.
- the user terminal 3a When the user terminal 3a communicates with the user terminal 3c for the ⁇ -VPN system 3-2 having such a configuration, data output from the user terminal 3a goes to the user terminal 3b, The user terminal 3b goes to the user terminal 3c, the user terminal 3c goes to the user terminal 3d, and as a result, the data reaches all the user terminals 3b, 3c, and 3d. Then, each user terminal determines whether or not the data is its own data, and receives only the data addressed to itself. Here, only the user terminal 3c receives the transmitted data from the user terminal 3a.
- the access line al to connect the WDM device and the user terminal a Place an optical transmission device effective for one line in all 8 COs.
- an optical transmission device effective for one line is placed on the backbone line “l to b4.”
- the backbone lines bl to b4 corresponding to all WDM wavelengths Fig.
- FIG. 13 is a diagram showing the configuration of a ⁇ -VPN system ⁇ -VPN system 3_3 transmits information to an optical path switch 300
- the ⁇ -VPN system 3-3 is composed of a network 30-3, user terminals 3a-3d, and an optical path switch 300, and the network 30-3 Within: WDM devices 31 to 38 as T-access line terminators.
- the user terminal 3a connects to the WDM device 31 via one access line a1 to which a wavelength of ⁇ 1 is assigned.
- the user terminal 3b is connected to the WDM device 32 via one access line a2 to which a wavelength of ⁇ 4 is assigned.
- the user terminal 3c is connected to the WDM device 33 via one access line a3 to which a wavelength of ⁇ 3 is assigned.
- the user terminal 3d is connected to the WDM device 34 via one access line a4 to which a wavelength of ⁇ 2 is assigned.
- Optical path switch 300 Connected to the WDM devices 35 to 38 via the four access lines a5 to a8 to which 4 is assigned.
- the connection configuration in the network 30-3 is such that the WDM device 31 is connected to the WDM device 35 via the backbone line b1 to which the wavelength of ⁇ 1 is assigned.
- the WDM device 32 is connected to the WDM device 38 via a backbone line b4 to which a wavelength of ⁇ 4 is assigned.
- the WDM device 33 is connected to the WDM device 37 via a backbone circuit b 3 to which a wavelength power S of ⁇ 3 is assigned.
- the WIM device 34 is connected to the WE> M device 36 via a backbone line b2 to which a wavelength of ⁇ 2 is assigned.
- the data of the user terminal 3a is transmitted to the optical path switching device 3 30 via the WDM device 31
- the information is transmitted via the optical path switch 35, and is recognized by the optical path exchange 300 as information addressed to the user's terminal 3c.
- the path switch 300 transmits data from the user terminal 3a to the user terminal 3c via the WDM devices 37 and 33.
- An optical transmission device 10 that is effective for one wave of the line is placed on all of the lines al to a4.
- all the access lines a5 to a8 that connect the WDM device and the optical path switch are provided with a transmission device effective for one line.
- an optical transmission device that is effective for one line is placed on the / p-point lines b1 to b4.
- an optical transmission device for collectively limiting the line speed corresponding to all the wavelengths of the WD ⁇ may be arranged for the back-point lines bl to b4.
- the optical transmission apparatus splits an optical signal, one is through, and the other is delayed and then combined again to generate an optical combined signal.
- an optical multiplexed signal that meets the pulse mask specification of the optical signal to be passed is generated, and for optical signals that exceed the contracted line speed and that are rejected.
- acceptance of the line speed of the input optical signal is limited. As a result, it is possible to guard that transmission at a certain line speed cannot be completed. Can be maintained and the reliability of system operation can be improved.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006510579A JP4353977B2 (ja) | 2004-03-04 | 2004-03-04 | 光伝送装置 |
PCT/JP2004/002775 WO2005086400A1 (ja) | 2004-03-04 | 2004-03-04 | 光伝送装置 |
US11/496,499 US7853146B2 (en) | 2004-03-04 | 2006-08-01 | Optical transmission apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/002775 WO2005086400A1 (ja) | 2004-03-04 | 2004-03-04 | 光伝送装置 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US11/496,499 Continuation US7853146B2 (en) | 2004-03-04 | 2006-08-01 | Optical transmission apparatus |
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WO2005086400A1 true WO2005086400A1 (ja) | 2005-09-15 |
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PCT/JP2004/002775 WO2005086400A1 (ja) | 2004-03-04 | 2004-03-04 | 光伝送装置 |
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US (1) | US7853146B2 (ja) |
JP (1) | JP4353977B2 (ja) |
WO (1) | WO2005086400A1 (ja) |
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JP5347674B2 (ja) * | 2009-04-15 | 2013-11-20 | 富士通株式会社 | 中継装置,信号処理装置および光通信システム |
EP2273708B1 (en) * | 2009-06-30 | 2013-06-05 | Alcatel Lucent | System and method for transmitting optical signals |
CN108418649B (zh) * | 2018-02-13 | 2019-10-11 | 中国联合网络通信集团有限公司 | 一种计算业务时延的方法和装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63500765A (ja) * | 1985-08-30 | 1988-03-17 | パシフィック・ベル | 光ファイバ帯域幅制限方法 |
JP2001230759A (ja) * | 2000-02-17 | 2001-08-24 | Hitachi Ltd | 波長多重伝送システム、それに用いる装置 |
JP2002094608A (ja) * | 2000-09-14 | 2002-03-29 | Anritsu Corp | 通信監視方法及び通信監視装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5222162A (en) * | 1991-11-27 | 1993-06-22 | Hughes Aircraft Company | Monolithic integrated optical time delay network for antenna beam steering |
JP3590066B2 (ja) * | 1994-05-23 | 2004-11-17 | ブリティッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | 光パケット処理 |
DE19519735A1 (de) * | 1995-06-02 | 1996-12-05 | Sel Alcatel Ag | Optisch gesteuertes optisches Koppelmodul, Verfahren zum optischen Steuern eines optischen Koppelnetzes und optisches Koppelnetz |
WO2001059982A1 (fr) * | 2000-02-14 | 2001-08-16 | Fujitsu Limited | Recepteur optique |
-
2004
- 2004-03-04 JP JP2006510579A patent/JP4353977B2/ja not_active Expired - Fee Related
- 2004-03-04 WO PCT/JP2004/002775 patent/WO2005086400A1/ja active Application Filing
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2006
- 2006-08-01 US US11/496,499 patent/US7853146B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63500765A (ja) * | 1985-08-30 | 1988-03-17 | パシフィック・ベル | 光ファイバ帯域幅制限方法 |
JP2001230759A (ja) * | 2000-02-17 | 2001-08-24 | Hitachi Ltd | 波長多重伝送システム、それに用いる装置 |
JP2002094608A (ja) * | 2000-09-14 | 2002-03-29 | Anritsu Corp | 通信監視方法及び通信監視装置 |
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US20070036549A1 (en) | 2007-02-15 |
JPWO2005086400A1 (ja) | 2008-01-24 |
US7853146B2 (en) | 2010-12-14 |
JP4353977B2 (ja) | 2009-10-28 |
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