CN103095368A - Light measuring device - Google Patents
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- CN103095368A CN103095368A CN2012104277372A CN201210427737A CN103095368A CN 103095368 A CN103095368 A CN 103095368A CN 2012104277372 A CN2012104277372 A CN 2012104277372A CN 201210427737 A CN201210427737 A CN 201210427737A CN 103095368 A CN103095368 A CN 103095368A
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Abstract
The present invention provides a light measuring device which can discriminate light with different wavelengths for measuring light intensity or performing OTDR measuring through a plurality of wavelengths of communication light, and furthermore the light measuring device can be used as a light source. The light measuring device is provided with the following components: a first connection part, a first laser module, a first light receiver, a light intensity measuring part and an OTDR measuring part. The light measuring device is characterized by comprising the following components: a second laser module (6) which selectively generates a plurality of kinds of communication wavelength measuring light; a first light filter (11) which separates communication light and return light of the measuring specialized light; a second light filter (12) which separates the plurality of kinds of communication light; a second light receiver (8) which receives one of the separated communication light; a third light receiver (9) which receives the other separated communication light; a first light coupler (14); a second connection part (2); a second light coupler (15) and a third light coupler (16). The light intensity measuring part further measures light intensity of the light which is received by the second light receiver or the third light receiver.
Description
Technical field
The present invention relates to the light measurement device that a kind of OTDR of carrying out measures and luminous intensity is measured.
Background technology
As the laying that is used for optical fiber, the determinator of maintenance, known have OTDR (Optical Time Domain Reflectometer) (for example, to refer to Patent Document 1.）。The light measurement device of patent documentation 1 possesses: connecting portion can be connected with determined optical fiber; Laser module produces light pulse; And optical receiver, reception is incident in the light echo of the light pulse of determined optical fiber, and described determinator carries out OTDR and measures.
Lay, the scene of maintenance optical fiber, in fact to an end incoming signal light of determined optical fiber, and receive this flashlight at the other end of determined optical fiber, and use the luminous intensity determinator also to carry out the mensuration of luminous intensity.So, lay, the director of maintenance except OTDR measures, a plurality of determinators such as the light supply apparatus of the ready signal light of having to or luminous intensity determinator also are carried to the scene.
As the light measurement device of integrated light source, OTDR determinator and luminous intensity determinator, for example just like disclosed light measurement device in patent documentation 2.
Patent documentation 1: Japanese Patent Publication 6-167417 communique
Patent documentation 2: No. 2010-146727, Japanese patent application
Summary of the invention
As one of mode of optical access network, PON(Passive Optical Network is arranged).In adopting the optical access network of this PON, take OLT(Optical Line Terminal) with ONU(Optical Network Unit) adopt 1 couple of N(N as positive number) and structure.As the data communication wavelength that is used for this PON, it is 1310nm that regulation has up (from ONU to OLT), and descending (from OLT to the ONU) different wave length that is 1490nm.And recently, except above-mentioned wavelength, as the wavelength that is used for sending from OLT vision signal, also use the situation of 1550nm more and more.Therefore, building or during maintenance PON, need distinguish that each wavelength light measures its power.
And usually optical fiber is according to the Communication ray wavelength and characteristic is different, even sometimes be lost in permissible range in the light of certain wavelength but lose not in permissible range in the light of other wavelength.Therefore, when laying or maintain PON, usually carry out OTDR with a plurality of communication light wavelengths and measure.
But, in the light measurement device of patent documentation 2, can't distinguish that a plurality of different wave lengths measure luminous intensity or carry out OTDR with a plurality of communication light wavelengths and measure.Measure the purposes of this luminous intensity if only be used for distinguishing a plurality of different wave lengths, can utilize the determinator that is called the OPN power meter, if measure but only depend on this device can't carry out OTDR, and also can't be used as light source, therefore have to prepare separately OTDR determinator or light source.
Therefore the object of the present invention is to provide 1 can distinguish that a plurality of different wave lengths carry out that luminous intensity is measured or carry out that OTDR measures and can be as the light measurement device of light source with a plurality of communication light wavelengths.
Light measurement device involved in the present invention (101,102), it be used for to arrange or maintenance connects 1 OLT(96 of the Communication ray that sends the 1st wavelength and the 2nd wavelength) with the optical fiber (93_3) of a plurality of ONU(97_1 that send the 3rd wavelength Communication ray～97_N), described light measurement device, it possesses: the 1st connecting portion (1) can connect described optical fiber; The 1st laser module (5), through described the 1st connecting portion towards described optical fiber penetrate as from the equal mensuration dedicated optical of the light pulse of the 4th different wavelength of described the 1st wavelength, the 2nd wavelength or the 3rd wavelength; The 1st optical receiver (7) receives from described optical fiber through the light echo of the described mensuration dedicated optical of described the 1st connecting portion incident and is converted to the signal of telecommunication; Luminous intensity determination part (21) is according to the luminous intensity of described signal of telecommunication mensuration by the light of described the 1st optical receiver reception; OTDR determination part (22), measure the characteristic of described optical fiber according to the luminous intensity of being measured by described luminous intensity determination part, described light measurement device, it is characterized in that, possess: the 2nd laser module (6) optionally produces as the 1st communication wavelengths of described the 1st wavelength light pulse and measures light and measure light as the 3rd communication wavelengths of described the 3rd wavelength light pulse; The 1st filter (11), reception from comprising of described the 1st connecting portion described the 1st wavelength and/or described the 2nd wavelength Communication ray and the light of the light echo of described mensuration dedicated optical, and be separated into the Communication ray of described the 1st wavelength and/or described the 2nd wavelength and the light echo of described mensuration dedicated optical; The 2nd filter (12) receives by described the 1st wavelength of described the 1st filter separation and/or the Communication ray of described the 2nd wavelength, and is separated into described the 1st wavelength Communication ray and described the 2nd wavelength Communication ray; The 2nd optical receiver (8) receives described the 1st wavelength Communication ray that is separated by described the 2nd filter and is converted to the signal of telecommunication; The 3rd optical receiver (9) receives described the 2nd wavelength Communication ray that is separated by described the 2nd filter and is converted to the signal of telecommunication; The 1st optical coupler (14), the described mensuration dedicated optical that reception is penetrated from described the 1st laser module also penetrates to described the 1st connecting portion via described the 1st filter, and receive the described mensuration dedicated optical of being separated by described the 1st filter and penetrate this light echo to described the 1st optical receiver; The 2nd connecting portion (2) can be connected with described optical fiber; The 2nd optical coupler (15), when described the 2nd connecting portion is connected with described optical fiber, reception is measured light and penetrates to described the 2nd connecting portion from described the 1st communication wavelengths mensuration light or described the 3rd communication wavelengths that described the 2nd laser module penetrates, and reception is measured the light echo of light or described the 3rd communication wavelengths mensuration light and penetrates this light echo to described the 1st optical coupler through described the 1st communication wavelengths of described the 2nd connecting portion incident; and the 3rd optical coupler (16), described the 1st communication wavelengths that reception is penetrated from described the 2nd optical coupler measures that light or described the 3rd communication wavelengths are measured light or described the 1st wavelength light of being separated by described the 2nd filter and penetrating to described the 2nd optical receiver, described the 1st optical coupler is further as follows, namely when the light from external light source is incident in described the 2nd connecting portion, reception is via this light of described the 2nd optical coupler and to described the 1st laser module ejaculation, and receiving this light penetrates at the reverberation of the end face reflection of described the 1st laser module and to described the 2nd optical coupler, and when the light echo of described the 1st communication wavelengths mensuration light or described the 3rd communication wavelengths mensuration light is incident in described the 2nd connecting portion, to described the 1st optical receiver ejaculation this light echo via described the 2nd optical coupler, described the 2nd optical receiver is further through described the 1st optical coupler, described the 2nd optical coupler and described the 3rd optical coupler be received in described the 1st laser module end face reflection reverberation and be converted to the signal of telecommunication, described luminous intensity determination part is further according to measure the luminous intensity of the light that receives from the described signal of telecommunication of described the 2nd optical receiver or described the 3rd optical receiver.
Because the 4th wavelength light, the 1st wavelength light and the 2nd wavelength light are separated by the 1st filter and the 2nd filter, can distinguish that therefore the light of a plurality of different wavelength carries out luminous intensity mensuration.And, optionally produce the light of the 1st or the 3rd wavelength due to the 2nd laser module, so can carry out OTDR with a plurality of communication light wavelengths and measure.And, owing to possessing, the 1st laser module and the 2nd laser module are arranged, therefore light measurement device involved in the present invention can also be as the light source of a plurality of wavelength.
Determinator involved in the present invention also can further possess: the 4th optical coupler (17), be inserted between described the 1st filter and described the 2nd filter, described the 1st wavelength that reception is separated by the 1st filter and/or the Communication ray of described the 2nd wavelength also carry out difference to it, penetrate by a side of the light of difference to described the 2nd filter; And the 5th optical coupler (18), be inserted between described the 1st optical coupler and described the 2nd optical coupler, one side of the light that reception is penetrated from described the 1st optical coupler is with the opposing party of the light that penetrates from described the 4th optical coupler and penetrate to described the 2nd optical coupler, and receive the light that penetrates from described the 2nd optical coupler and it is carried out difference, penetrate by a side of the light of difference to described the 1st optical coupler, penetrate by the opposing party of the light of difference to described the 4th optical coupler.
Thus, described filter is connected in described the 1st connecting portion, if any of described a plurality of ONU is connected in described the 2nd connecting portion, described OLT with described a plurality of ONU any can keep intercoming mutually.
Determinator involved in the present invention also can be as follows, namely be connected in described the 1st connecting portion at described optical fiber, any in described a plurality of ONU is connected in described the 2nd connecting portion, and under state that any in described OLT and described a plurality of ONU keeps communicating by letter, described OTDR determination part only during described luminous intensity determination part does not carry out from the mensuration of the luminous intensity of described the 2nd optical receiver, is measured the characteristic of described optical fiber by described the 1st laser module.
Thus, can carry out OTDR under the state that OLT and ONU keep communicating by letter measures.
According to the present invention, can provide 1 can distinguish that a plurality of different wave lengths carry out that luminous intensity is measured or carry out that OTDR measures and can also be as the light measurement device of light source with a plurality of communication light wavelengths.
Description of drawings
Fig. 1 represents the schematic diagram of PON.
Fig. 2 represents an example of the light measurement device that execution mode 1 is related.
Fig. 3 represents an example of the light measurement device that execution mode 2 is related.
In figure: 1-the 1st connecting portion, 2-the 2nd connecting portion, 5-the 1st laser module, 6-the 2nd laser module, 7-the 1st optical receiver, 8-the 2nd optical receiver, 9-the 3rd optical receiver, 11-the 1st filter, 12-the 2nd filter, 14-the 1st optical coupler, 15-the 2nd optical coupler, 16-the 3rd optical coupler, 17-the 4th optical coupler, 18-the 5th optical coupler, 21-luminous intensity determination part, 22-OTDR determination part, the 92-optical splitter, 96-OLT, 97_1～97_N-ONU.
Embodiment
(execution mode 1)
Using light measurement device 101 involved in the present invention to carry out OTDR with a plurality of Communication ray wavelength in execution mode 1 measures.
Fig. 1 represents the schematic diagram of PON.The OLT91 of central side is connected by optical splitter 92 with a plurality of ONU97_1～97_N of entrant's side.A plurality of ONU97_1～97_N are connected with optical splitter 92 through optical fiber 93_1～93_N respectively.Send the Communication ray of the wavelength 1490nm that uses as data-signal and the Communication ray of the wavelength 1550nm that uses as vision signal from OLT91.And, send respectively the Communication ray of wavelength 1310nm from a plurality of ONU97_1～97_N.
Fig. 2 represents the light measurement device of the present invention 101 that execution mode 1 is related.The related light measurement device 101 of present embodiment 1 possesses the 1st connecting portion 1 is arranged, the 2nd connecting portion 2, the 1st laser module 5, the 2nd laser module 6, the 1st optical receiver 7, the 2nd optical receiver 8, the 3rd optical receiver 9, the 1st filter 11, the 2nd filter 12, the 1st optical coupler 14, the 2nd optical coupler 15, the 3rd optical coupler 16, luminous intensity determination part 21 and OTDR determination part 22.
The 1st laser module 5 does not use in execution mode 1, but penetrates the mensuration dedicated optical as the pulsed light of wavelength 1650nm.
The 2nd laser module 6 optionally penetrates as the 1st communication wavelengths of the light pulse of wavelength 1550nm and measures light and measure light as the 3rd communication wavelengths of the light pulse of wavelength 1310nm.The 2nd laser module 5 can for example be made of 1 Wavelength variable laser module, also can for example be made of the laser module of wavelength 1550nm, laser module and the optical switch of wavelength 1310nm.
The 1st optical receiver 7 is the optical receivers be used to the luminous intensity of measuring light echo described later, and the light that receives is converted to the signal of telecommunication.The 1st optical receiver 7 is for example by APD(Avalanche Photo Diode) consist of.
The 2nd optical receiver 8 and the 3rd optical receiver 9 do not use in execution mode 1, are for the optical receiver of the luminous intensity of measuring Communication ray, and the light that receives is converted to the signal of telecommunication.The 2nd optical receiver 8 and the 3rd optical receiver 9 for example are made of PIN type photodiode.
The 1st filter 11 does not use in execution mode 1, is for separating of the light echo of aftermentioned wavelength 1650nm and the filter of Communication ray.Its input side port one 11 is connected in the 1st connecting portion 1.And the 1st port one 12 of its outlet side is set as the output wavelength light shorter than wavelength 1650nm, and is connected in the 1st filter 12.And the 2nd port one 13 of its outlet side is set as the above light of output wavelength 1650nm, and is connected in the 1st optical coupler 14.
The 2nd filter 12 does not use in execution mode 1 yet, is the filter for separating of the Communication ray of the Communication ray of wavelength 1490nm and wavelength 1550nm.Its input side port one 21 is connected in the 1st filter 11.And the 1st port one 22 of its outlet side is set as the output wavelength light longer than wavelength 1490nm, and is connected in the 2nd optical receiver 8.And the 2nd port one 23 of its input side is set as the following light of output wavelength 1490nm, and is connected in the 3rd optical receiver 9.
The 1st optical coupler 14 has respectively 2 ports (141,142,143,144) at two ends, the 1st port one 41 of an end is connected in the 1st laser module 5, the 2 port ones 42 and is connected in the 1st optical receiver 7.And the 1st port one 43 of the other end is connected in the 2nd optical coupler 15, the 2 port ones 44 and is connected in the 1st filter 11.
The 2nd optical coupler 15 has respectively 2 ports (151,152,153,154) at two ends, the 1st port one 51 of an end is connected in the 2nd laser module 6, the 2 port ones 52 and is connected in the 1st optical coupler 14.And the 1st port one 53 of the other end is connected in the 2nd connecting portion 2, the 2 port ones 54 and is connected in the 3rd coupler 16.
The 3rd optical coupler 16 at one end has 2 ports (161,162), and the 1st port one 61 that has 1 port one 63, one end at the other end is connected in the 2nd optical coupler 15, the 2 port ones 62 and is connected in the 2nd filter 12.And the port one 63 of the other end is connected in the 2nd optical receiver 8.
The signal of telecommunication that luminous intensity determination part 21 is changed separately according to the 1st optical receiver 7, the 2nd optical receiver 8 and the 3rd optical receiver 9 is measured the luminous intensity of the light that is received by each optical receiver 7～9.
The measurement result that OTDR determination part 22 is measured according to luminous intensity determination part 21 is carried out OTDR and is measured.
Now, to carrying out OTDR mensuration for the ONU97_3 of connection layout 1 and the optical fiber 933 of optical splitter 92.For this reason, in optical fiber 93_3, an end of ONU97_3 side is cut off, and is connected in the 2nd connecting portion 2 of the related light measurement device of execution mode 1 101.
At this moment, the 1st laser module 5 of the light measurement device 101 that execution mode 1 is related can not be activated, and measures light or measures light as the 3rd communication wavelengths of the light pulse of wavelength 1310nm but optionally penetrate as the 1st communication wavelengths of the light pulse of wavelength 1550nm from the 2nd laser module 6.
The the 1st or the 3rd communication wavelengths is measured light and is penetrated from the 2nd connecting portion 2 to optical fiber 93_3 via the 2nd optical coupler 15.The communication wavelengths that is incident in optical fiber 93_3 measures that light produces Rayleigh scattering etc. during Transmission Fibers 93_3 or based on the reflection of pip, and generation is from the light echo of optical fiber 93_3 towards the 2nd connecting portion 2.
This light echo is incident in the 1st optical receiver 7 from the 2nd connecting portion 2 via the 2nd optical coupler 15 and the 1st optical coupler 14.
Measure the luminous intensity of the light echo that is incident in the 1st optical receiver 7 with luminous intensity determination part 21, carry out OTDR according to its measurement result OTDR determination part 22 and measure, realize for optical fiber 93_3, OTDR mensuration measure light or the 3rd communication wavelengths mensuration light based on the 1st communication wavelengths with 1 related light measurement device 101 of execution mode 1 thus.
In addition, in execution mode 1, optical fiber 93_3 is connected with OLT96 through optical splitter 92, and during OLT96 is used, measure light from the 1st communication wavelengths of the Communication ray of OLT96 and the related light measurement device 101 of execution mode 1 and influence each other, the OTDR that therefore can't carry out optical fiber 93_3 measures.
(execution mode 2)
In execution mode 2, undertaken the OTDR of optical fiber 93_3 is measured by the mensuration dedicated optical of wavelength 1650nm.The related light measurement device 101 of the structure of the light measurement device that execution mode 2 is related and execution mode shown in Figure 21 is identical.But the end of optical fiber 93_3 is connected in the 1st connecting portion 1 of light measurement device 101.
In the related light measurement device 101 of execution mode 2, the 2nd laser module 6 can not be activated, but penetrates the mensuration dedicated optical of wavelength 1650nm from the 1st laser module 5.
This is measured dedicated optical and penetrates from the 1st connecting portion 1 to optical fiber 93_3 via the 1st optical coupler 14 and the 1st filter 11.The light echo that produces at optical fiber 93_3 is incident in the 1st optical receiver 7 from the 1st connecting portion 1 via the 1st filter 11 and the 1st optical coupler 14.
Measure the luminous intensity of the light echo that is incident in the 1st optical receiver 7 with luminous intensity determination part 21, and carry out OTDR according to its measurement result OTDR determination part 22 and measure, realize thus for optical fiber 93_3, measure based on the OTDR that measures dedicated optical.
In addition, in execution mode 2, even also have the 1st～the 3rd Communication ray to be incident in the 1st connecting portion 1 except the light echo of measuring dedicated optical, but the 1st filter 11 separates the light shorter than wavelength 1650nm to export to the 1st port one 12 of outlet side, roughly only exports at the 2nd port one 13 of outlet side the light echo of measuring dedicated optical.Therefore, even OLT91 in utilization, also can not affected by Communication ray and carry out OTDR and measure.
(execution mode 3)
When the light measurement device 101 that execution mode 3 is related is used as the stabilized light source of wavelength 1310nm or 1550nm, start the 2nd laser module 6.The wavelength 1310nm that optionally penetrates from the 2nd laser module 6 or the light of 1550nm are incident in the 1st port one 51 of an end of the 2nd optical coupler 15, and penetrate to the 2nd connecting portion 2 from the 1st port one 53 of the other end, and be incident in the 2nd optical receiver 8 from the 2nd port one 54 of the other end.
Measure the luminous intensity of the light that is incident in the 2nd optical receiver 8 with luminous intensity determination part 21.Can remain constant by the luminous intensity of the following light that will penetrate from the 2nd connecting portion 2, namely stablize control part remaining constant mode by the luminous intensity that luminous intensity determination part 21 is measured by not shown luminous intensity, control inputs is in the electric current of the 2nd laser module 6.
In addition, when the light measurement device 101 that execution mode 3 is related is used as the light source of wavelength 1650nm, start the 1st laser module 5.The light of the wavelength 1650nm that penetrates from the 1st laser module 5 penetrates to the 2nd connecting portion 2 via the 1st optical coupler 14 and the 2nd optical coupler 15, and is incident in the 2nd optical receiver 8 from the 2nd optical coupler 15.Can remain by the luminous intensity of the following light that will penetrate from the 2nd connecting portion 2 constantly, namely stablize control part remaining constant mode by the luminous intensity of luminous intensity determination part 21 mensuration by luminous intensity, control inputs is in the electric current of the 1st laser module 5.
(execution mode 4)
The height output light that is incident in the 2nd connecting portion 2 is incident in the 1st laser module 5 via the 2nd optical coupler 15 and the 1st optical coupler 14.At this moment, can between the 1st optical coupler 14 and the 1st optical receiver 7, optical shutter be set, and close this optical shutter as the related luminous intensity determinator of execution mode 4 time, in order to avoid high output light is incident in the 1st optical receiver 7.
Be incident in the height output light of the 1st laser module 5 at the end face reflection of the 1st laser module 5, again turn back to the 1st optical coupler 14, be incident in the 2nd optical receiver 8 via the 2nd optical coupler 15.Luminous intensity determination part 21 is measured the luminous intensity of the light that is incident in the 2nd optical receiver 8.And luminous intensity determination part 21 is proofreaied and correct the luminous intensity of being measured with pre-stored corrected value.With regard to corrected value, prior poor by the wavelength luminous intensity of measuring in advance the light that is incident in the 2nd connecting portion 2 and the luminous intensity of being measured by the 2nd optical receiver 8 for example, and be stored in advance luminous intensity determination part 21.Thus, the related light measurement device 101 of execution mode 4 can carry out the luminous intensity mensuration based on the height output light of external light source.
(execution mode 5)
Be incident in the Communication ray of the 1st connecting portion 1 to the 1st port one 12 outputs of the outlet side of the 1st filter 11, and be incident in the 2nd filter 12.Be incident in the Communication ray of the 2nd filter, the Communication ray of wavelength 1550nm is exported to the 1st port one 22 of the outlet side of the 2nd filter 12, and is incident in the 2nd optical receiver 8 via the 3rd optical coupler 16.Luminous intensity determination part 21 is measured the luminous intensity of the light that is incident in the 2nd optical receiver 8.
In addition, be incident in the Communication ray of the 2nd filter, the Communication ray of wavelength 1490nm is exported to the 2nd port one 23 of the outlet side of the 2nd filter 12, and is incident in the 3rd optical receiver 9.Luminous intensity determination part 21 is measured the luminous intensity of the light that is incident in the 3rd optical receiver 9.Thus, the related light measurement device 101 of execution mode 5 can be distinguished from the wavelength 1490nm of OLT96 and the Communication ray of wavelength 1550nm and carry out luminous intensity mensuration.
(execution mode 6)
The related light measurement device of execution mode 6 is for being used under the state that OLT96 and ONU97_3 keep communicate by letter realization based on the device of the OTDR mensuration of the mensuration dedicated optical of wavelength 1650nm.
Fig. 3 represents the light measurement device of the present invention 102 that execution mode 6 is related.The related light measurement device 102 of present embodiment 6 has appended the 4th optical coupler 17 and the 5th optical coupler 18 on the structure of the related light measurement device of the present invention 101 of execution mode 1～execution mode 5.
The 4th optical coupler 17 at one end has 1 port one 71, has 2 ports (172,173) at the other end, and the port one 71 of an end is connected in the 1st port one 12 of the outlet side of the 1st filter 11.And input side port one 21, the 2 port ones 73 that the 1st port one 72 of the other end is connected in the 2nd filter 12 are connected in the 5th optical coupler 18.
The 5th optical coupler 18 at one end has 2 ports (181,182), and the 1st port one 81 that has 1 port one 83, one end at the other end is connected in the 4th optical coupler 17, the 2 port ones 82 and is connected in the 1st optical coupler 14.And the port one 83 of the other end is connected in the 2nd optical coupler 15.
The optical fiber 97_3 that is measured by OTDR is connected in the 1st connecting portion 1.And ONU97_3 is connected in the 2nd connecting portion 2., and via the 1st filter 11, the 4th optical coupler 17, the 5th optical coupler 18, and the 2nd optical coupler 15, penetrate to ONU97_3 from the 2nd connecting portion 2 from the 1st connecting portion 1 incident from the Communication ray of the wavelength 1490nm of OLT96 and wavelength 1550nm.And,, via the path opposite with aforesaid paths, penetrate to OLT96 from the 1st connecting portion 1 after the 2nd connecting portion 2 incidents from the Communication ray of the wavelength 1310nm of ONU97_3.Thus, though the related light measurement device 102 of execution mode 6 in OTDR measures, OLT96 and ONU97_3 also can keep communications status.
The Communication ray that is incident in the 1st connecting portion 1 from OLT96 can to the 2nd port one 13 outputs of outlet side, therefore not affect the 1st optical receiver 7 in OTDR mensuration because of the 1st filter 11.But the Communication ray that is incident in the 2nd connecting portion 2 from ONU97_3 also is incident in the 1st optical receiver 7, will affect OTDR under this state and measure.Below describe being used for removing this method from the impact of the Communication ray of ONU97_3.
In PON, from the Communication ray time division multiplexing of a plurality of ONU97_1～ONU97_N.Therefore, export with the burst shape from the Communication ray of ONU97_3.At this, according to the method for explanation in execution mode 4, by receive and be determined at by luminous intensity determination part 21 Communication ray of the end face reflection of the 1st laser module 5 with the 2nd optical receiver 8, can measure the Communication ray whether incident has the burst shape.And, if only during the mensuration of the shape Communication ray that happens suddenly, carry out measuring based on the OTDR of the mensuration dedicated optical of wavelength 1650nm according to the method for explanation in execution mode 2, can realize exactly OTDR mensuration under the state that OLT96 and ONU97_3 keep communicating by letter.
As above, light measurement device involved in the present invention can distinguish that a plurality of different wave lengths carry out luminous intensity mensuration or carry out OTDR with a plurality of communication light wavelengths and measure with 1, and owing to can also be used as light source, so can reduce in order to lay or to maintain optical fiber and the quantity of the device that carries.And, use because a plurality of component parts of light measurement device involved in the present invention are common to be a plurality of functions, so can than the integrated more miniaturization of the device of simple function, also make contributions for reducing installation cost.And the related light measurement device 102 of execution mode 6 can carry out optical fiber under the state that OLT and ONU keep communicating by letter OTDR measures, and can also be used in the supervision purposes of optical fiber etc.
Utilizability on industry
The present invention can be applicable to the information communication industry.
Claims (3)
1. a light measurement device (101,102), 1 OLT that it be used for to arrange or maintenance connects the Communication ray that sends the 1st wavelength and the 2nd wavelength is optical line terminal (96) is the optical network unit (optical fiber (93_3) of 97_1～97_N) with a plurality of ONU that send the Communication ray of the 3rd wavelength, described light measurement device, it possesses:
The 1st connecting portion (1) can connect described optical fiber;
The 1st laser module (5), through described the 1st connecting portion towards described optical fiber penetrate as from the equal mensuration dedicated optical of the light pulse of the 4th different wavelength of described the 1st wavelength, the 2nd wavelength or the 3rd wavelength;
The 1st optical receiver (7) receives from described optical fiber through the light echo of the described mensuration dedicated optical of described the 1st connecting portion incident and is converted to the signal of telecommunication;
Luminous intensity determination part (21) is according to the luminous intensity of described signal of telecommunication mensuration by the light of described the 1st optical receiver reception;
The OTDR determination part is optical time domain reflection determination part (22), measures the characteristic of described optical fiber according to the luminous intensity of being measured by described luminous intensity determination part,
Described light measurement device is characterized in that, possesses:
The 2nd laser module (6) optionally produces as the 1st communication wavelengths of described the 1st wavelength light pulse and measures light and measure light as the 3rd communication wavelengths of described the 3rd wavelength light pulse;
The 1st filter (11), reception from comprising of described the 1st connecting portion described the 1st wavelength and/or described the 2nd wavelength Communication ray and the light of the light echo of described mensuration dedicated optical, and be separated into the Communication ray of described the 1st wavelength and/or described the 2nd wavelength and the light echo of described mensuration dedicated optical;
The 2nd filter (12) receives by described the 1st wavelength of described the 1st filter separation and/or the Communication ray of described the 2nd wavelength, and is separated into described the 1st wavelength Communication ray and described the 2nd wavelength Communication ray;
The 2nd optical receiver (8) receives described the 1st wavelength Communication ray that is separated by described the 2nd filter and is converted to the signal of telecommunication;
The 3rd optical receiver (9) receives described the 2nd wavelength Communication ray that is separated by described the 2nd filter and is converted to the signal of telecommunication;
The 1st optical coupler (14), the described mensuration dedicated optical that reception is penetrated from described the 1st laser module also penetrates to described the 1st connecting portion via described the 1st filter, and receive the described mensuration dedicated optical of being separated by described the 1st filter and penetrate this light echo to described the 1st optical receiver;
The 2nd connecting portion (2) can be connected with described optical fiber;
The 2nd optical coupler (15), when described the 2nd connecting portion is connected with described optical fiber, reception is measured light and penetrates to described the 2nd connecting portion from described the 1st communication wavelengths mensuration light or described the 3rd communication wavelengths that described the 2nd laser module penetrates, and reception is measured the light echo of light or described the 3rd communication wavelengths mensuration light and penetrates this light echo to described the 1st optical coupler through described the 1st communication wavelengths of described the 2nd connecting portion incident; And
The 3rd optical coupler (16) receives that described the 1st communication wavelengths that penetrates from described the 2nd optical coupler measures that light or described the 3rd communication wavelengths are measured light or described the 1st wavelength light of being separated by described the 2nd filter and penetrating to described the 2nd optical receiver,
Described the 1st photo-coupler is further as follows, namely when the light from external light source is incident in described the 2nd connecting portion, reception is via this light of described the 2nd photo-coupler and to described the 1st laser module ejaculation, and receiving this light penetrates at the reverberation of the end face reflection of described the 1st laser module and to described the 2nd photo-coupler, and when the light echo of described the 1st communication wavelengths mensuration light or described the 3rd communication wavelengths mensuration light is incident in described the 2nd connecting portion, to described the 1st optical receiver, penetrate this light echo via described the 2nd photo-coupler
Described the 2nd optical receiver further through described the 1st optical coupler, described the 2nd optical coupler and described the 3rd optical coupler be received in described the 1st laser module end face reflection reverberation and be converted to the signal of telecommunication,
Described luminous intensity determination part is further according to measure the luminous intensity of the light that receives from the described signal of telecommunication of described the 2nd optical receiver or described the 3rd optical receiver.
2. light measurement device as claimed in claim 1, is characterized in that, further possesses:
The 4th optical coupler (17), be inserted between described the 1st filter and described the 2nd filter, reception is by the Communication ray of described the 1st wavelength of the 1st filter separation and/or described the 2nd wavelength and it is carried out difference, penetrates by a side of the light of difference to described the 2nd filter; And
The 5th optical coupler (18), be inserted between described the 1st optical coupler and described the 2nd optical coupler, the opposing party of one side of the light that reception is penetrated from described the 1st optical coupler and the light that penetrates from described the 4th optical coupler also penetrates to described the 2nd optical coupler, and receive the light that penetrates from described the 2nd optical coupler and it is carried out difference, penetrate by a side of the light of difference to described the 1st optical coupler, penetrate by the opposing party of the light of difference to described the 4th optical coupler.
3. light measurement device as claimed in claim 2, is characterized in that,
Be connected in described the 1st connecting portion at described optical fiber, any of described a plurality of ONU is connected in described the 2nd connecting portion, and under any state that keeps communicating by letter of described OLT and described a plurality of ONU,
Described OTDR determination part only during described luminous intensity determination part does not carry out from the mensuration of the luminous intensity of described the 2nd optical receiver, is measured the characteristic of described optical fiber by described the 1st laser module.
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| JP2011-241845 | 2011-11-04 | ||
| JP2011241845A JP5564027B2 (en) | 2011-11-04 | 2011-11-04 | Light measuring device |
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| CN101047451A (en) * | 2006-06-16 | 2007-10-03 | 华为技术有限公司 | Method for on-line measuring parameter of passive optical network function |
| CN101217313A (en) * | 2008-01-11 | 2008-07-09 | 北京邮电大学 | A fault diagnosis method applied OTDR passive optical network optical fiber |
| CN101296039A (en) * | 2007-04-28 | 2008-10-29 | 英保达股份有限公司 | Optical fiber link monitoring system and method for passive optical fiber network |
| US20080279549A1 (en) * | 2007-05-09 | 2008-11-13 | Tohru Kazawa | Optical line terminal and optical network unit capable of alarm transmission scheme for passive optical network system |
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| JP3967346B2 (en) * | 2004-09-06 | 2007-08-29 | アンリツ株式会社 | Optical line abnormality diagnosis device |
| JP5179122B2 (en) * | 2007-08-30 | 2013-04-10 | アンリツ株式会社 | Optical line abnormality diagnosis apparatus and operation screen display method of the apparatus |
| JP2009085684A (en) * | 2007-09-28 | 2009-04-23 | Yokogawa Electric Corp | Optical pulse tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101047451A (en) * | 2006-06-16 | 2007-10-03 | 华为技术有限公司 | Method for on-line measuring parameter of passive optical network function |
| CN101296039A (en) * | 2007-04-28 | 2008-10-29 | 英保达股份有限公司 | Optical fiber link monitoring system and method for passive optical fiber network |
| US20080279549A1 (en) * | 2007-05-09 | 2008-11-13 | Tohru Kazawa | Optical line terminal and optical network unit capable of alarm transmission scheme for passive optical network system |
| CN101217313A (en) * | 2008-01-11 | 2008-07-09 | 北京邮电大学 | A fault diagnosis method applied OTDR passive optical network optical fiber |
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| CN103095368B (en) | 2015-07-01 |
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