CN102916740A - Bidirectional optical power measurement device and method for multi-wavelength passive optical network - Google Patents
Bidirectional optical power measurement device and method for multi-wavelength passive optical network Download PDFInfo
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- CN102916740A CN102916740A CN201210431776XA CN201210431776A CN102916740A CN 102916740 A CN102916740 A CN 102916740A CN 201210431776X A CN201210431776X A CN 201210431776XA CN 201210431776 A CN201210431776 A CN 201210431776A CN 102916740 A CN102916740 A CN 102916740A
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Abstract
The invention discloses a bidirectional optical power measurement device and a method for a multi-wavelength passive optical network and relates to the optical power measurement of an optical access network. The measurement device comprises a first OLT (optical line terminal) port connected with an OLT, a first ONU (optical network unit) port connected with an ONU, a 2*2 optical branching device, a CPU (central processing unit) processing unit, a first adjustable filter, a first optical detector, a first A/D (analog/digital) converter, a second adjustable filter, a second detector, a second A/D converter, a display screen and buttons, wherein the 2*2 optical branching device is connected with the first OLT port, the first ONU port, the first adjustable filter and the second adjustable filter; and the first adjustable filter is connected with the first A/D converter through the first optical detector; and the second adjustable filter is connected with the second A/D converter through the second optical detector. The bidirectional optical power measurement device can simultaneously carry out bidirectional optical power measurement at any wavelength in the multi-wavelength PON (passive optical network) system and is applicable to optical access networks with various wavelength designs such as WDM (wavelength division multiplexing) and PON.
Description
Technical field
The present invention relates to the fields of measurement of optical signal power in the Optical Access Network, particularly relate to bi-directional light power-measuring device and method in a kind of multi-wavelength passive optical network.
Background technology
PON(Passive Optical Network, EPON) is a kind of advanced person's Optical Access Network technology, it adopts point-to-multipoint topological structure, mainly comprise the OLT(Optical Line Terminal that is positioned at local side, optical line terminal), the ONU(Optical Network Unit of user's side, optical network unit) and ODN(Optical Distribution Network, optical distribution network) three parts form." passive " of EPON refers to that optical distribution network all is comprised of optical passive component, do not contain any electronic device and power supply.Consider that from implementation cost and the convenient angle of maintenance EPON generally adopts the single fiber access way, in simple optical fiber, transmit the up-down bidirectional light signal.
PON can be divided into power Splittable PON and WDM PON(Wavelength Division Multiplexing PON by the signal method of salary distribution, wavelength division multiplexing type EPON), power Splittable PON comprises EPON(Ethernet Passive Optical Network, Ethernet passive optical network) and GPON(Gigabit-Capable Passive Optical Network, gigabit/gigabit passive optical network), EPON, GPON all adopts star coupler along separate routes, the up/down row transmits and adopts TDMA/TDM(Time Division Multiple Address/Time Division Multiplex, time division multiple access and time division multiplexing) mode realizes that channel width shares, the signal power that splitter sends OLT is assigned on each ONU.WDM PON technology then is that wavelength-division multiplex technique is used among the PON, by wavelength division component signal is assigned to each road ONU.
Light power meter is for the instrument of measuring absolute light power or the luminous power relative loss factor by one section optical fiber.In the engineering maintenance work of reality, the same time of traditional light power meter can only be measured the power of a specific wavelength of a direction.Because the master slave relation of OLT, ONU in the PON system, therefore need to be under the state that OLT, ONU are communicated with the luminous power of on-line measurement up-down bidirectional, the light power meter that is applied to EPON, GPON can only be measured the luminous power of 3 wavelength (1310nm, 1490nm, 1550nm) of EPON and GPON up-down bidirectional.But in WDM PON system, number of wavelengths generally is 16,32, even more; In the EPON based on other wavelength arrangements, also need to measure the power of up-downgoing wavelength, be beneficial to carrying out of maintenance work, traditional luminous power is taken into account existing PON light power meter all can't precise measuring power.
In sum, existing PON light power meter can only fixation measuring EPON, 1310nm, the 1490nm that defines in the GPON system standard, the luminous power of 1550nm wavelength, can not measure the luminous power of bi-directional wavelength in the EPON of WDM PON and other wavelength arrangements.
Summary of the invention
The objective of the invention is in order to overcome the deficiency of above-mentioned background technology, bi-directional light power-measuring device and method in a kind of multi-wavelength passive optical network are provided, can in the PON of multi-wavelength system, carry out simultaneously the bi-directional light power measurement of any wavelength, be specially adapted to the novel optical access network of the various wavelength planning such as WDM PON system, can also be implemented in the setting wave-length coverage of up-downgoing in the PON system and carry out spectral scan.
Bi-directional light power-measuring device in the multi-wavelength passive optical network provided by the invention, comprise an OLT port, an ONU port, 2 * 2 optical branching devices, CPU processing unit, the first tunable filter, the first photodetector, the first A/D converter, the second tunable filter, the second photodetector, the second A/D converter, display screen, button, described bi-directional light power-measuring device links to each other with the terminal OLT device of outside by an OLT port, links to each other with the far-end ONU equipment of outside by an ONU port; 2 * 2 optical branching devices link to each other with an OLT port, an ONU port, the first tunable filter, the second tunable filter respectively; The first tunable filter links to each other with the first A/D converter by the first photodetector, the second tunable filter links to each other with the second A/D converter by the second photodetector, the first tunable filter, the first A/D converter, the second tunable filter, the second A/D converter, display screen, button all link to each other with the CPU processing unit, wherein:
2 * 2 optical branching devices are used for: adopt the mode of cross-over connection, the part downlink optical signal that OLT sends is introduced the second tunable filter, the part uplink optical signal that ONU sends is introduced the first tunable filter;
The first tunable filter is used for: under the control of CPU processing unit, filter, select the output of ONU uplink optical signal;
The first photodetector is used for: export after the ONU uplink optical signal of the first tunable filter input is converted to the signal of telecommunication;
The first A/D converter is used for: the signal of telecommunication to the input of the first photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The second tunable filter is used for: under the control of CPU processing unit, filter, select the output of OLT downlink optical signal;
The second photodetector is used for: export after the OLT downlink optical signal of the second tunable filter input is converted to the signal of telecommunication;
The second A/D converter is used for: the signal of telecommunication to the input of the second photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The CPU processing unit is used for control the first tunable filter and filters, selects the output of ONU uplink optical signal, controls the second tunable filter and filters, selects the output of OLT downlink optical signal; And the digital signal of the first A/D converter, the second A/D converter input carried out calculating and the compensation of luminous power, and the up-downgoing measuring light power result that will select wavelength outputs to display screen;
Button is used for: the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength of measurement are set;
Display screen is used for: show configuration information and measuring light power information.
In technique scheme, described 2 * 2 optical branching devices comprise 4 ports: the 2nd OLT port, the 2nd ONU port, the first tunable filter port, the second tunable filter port, described 2 * 2 optical branching devices link to each other with an OLT port by the 2nd OLT port, realize that 2 * 2 optical branching devices are connected with OLT; Link to each other with an ONU port by the 2nd ONU port, realize that 2 * 2 optical branching devices are connected with ONU; 2 * 2 optical branching devices link to each other with the first tunable filter by the first tunable filter port, link to each other with the second tunable filter by the second tunable filter port.
In technique scheme, described 2 * 2 optical branching devices adopt the splitting ratio of 5:95, and 95% in the downlink optical signal of the 2nd OLT port is from the output of the 2nd ONU port, and 5% from the output of the second tunable filter port, arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port 95% is from the output of the 2nd OLT port, and 5% from the output of the first tunable filter port, arrives the first tunable filter; It is 0.5dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
In technique scheme, described 2 * 2 optical branching devices adopt the splitting ratio of 10:90, and 90% in the downlink optical signal of the 2nd OLT port is from the output of the 2nd ONU port, and 10% from the output of the second tunable filter port, arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port 90% is from the output of the 2nd OLT port, and 10% from the output of the first tunable filter port, arrives the first tunable filter; It is 0.7dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
In technique scheme, the wave-length coverage of described the first tunable filter, the second tunable filter, the first photodetector, the second photodetector work is all between 1200 ~ 1700 nanometers.
It is a kind of based on the bi-directional light power measurement method in the multi-wavelength passive optical network of above-mentioned bi-directional light power-measuring device that the present invention also provides, and may further comprise the steps:
The optical signal transmission of S1, OLT emission is to an OLT port of bi-directional light power-measuring device, Optical Fiber Transmission to 2 by this bi-directional light power-measuring device inside * 2 optical branching devices is transferred to the second tunable filter through 2 * 2 optical branching device rear section downlink optical signals; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set, the second tunable filter filters under the control of CPU processing unit, selects the OLT downlink optical signal, outputs to the second photodetector; After being converted to the signal of telecommunication, the OLT downlink optical signal that the second photodetector is inputted the second tunable filter outputs to the second A/D converter, the second A/D converter carries out mould/number conversion to the signal of telecommunication of the second photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the second A/D converter input, the descending measuring light power result who selectes wavelength is outputed to display screen show;
The optical signal transmission of S2, ONU emission is to an ONU port of bi-directional light power-measuring device, Optical Fiber Transmission to 2 by this bi-directional light power-measuring device inside * 2 optical branching devices is transferred to the first tunable filter through 2 * 2 optical branching device rear section uplink optical signals; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set, the first tunable filter filters under the control of CPU processing unit, selects the ONU uplink optical signal, outputs to the first photodetector; After being converted to the signal of telecommunication, the ONU uplink optical signal that the first photodetector is inputted the first tunable filter outputs to the first A/D converter; The first A/D converter carries out mould/number conversion to the signal of telecommunication of the first photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the first A/D converter input, the up measuring light power result who selectes wavelength is outputed to display screen show.
In technique scheme, described 2 * 2 optical branching devices comprise 4 ports: the 2nd OLT port, the 2nd ONU port, the first tunable filter port, the second tunable filter port, described 2 * 2 optical branching devices link to each other with an OLT port by the 2nd OLT port, realize that 2 * 2 optical branching devices are connected with OLT; Link to each other with an ONU port by the 2nd ONU port, realize that 2 * 2 optical branching devices are connected with ONU; 2 * 2 optical branching devices link to each other with the first tunable filter by the first tunable filter port, link to each other with the second tunable filter by the second tunable filter port; The light signal of described OLT emission is through the 2nd OLT port of an OLT port transmission to 2 * 2 optical branching devices, then from the second tunable filter port transmission of 2 * 2 optical branching devices to the second tunable filter; The light signal of ONU emission is transferred to the 2nd ONU port of 2 * 2 optical branching devices through an ONU port transmission to 2 * 2 optical branching devices, then from the first tunable filter port transmission of 2 * 2 optical branching devices to the first tunable filter.
In technique scheme, described 2 * 2 optical branching devices adopt the splitting ratio of 5:95, and 95% in the downlink optical signal of the 2nd OLT port is from the output of the 2nd ONU port, and 5% from the output of the second tunable filter port, arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port 95% is from the output of the 2nd OLT port, and 5% from the output of the first tunable filter port, arrives the first tunable filter; It is 0.5dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
In technique scheme, described 2 * 2 optical branching devices adopt the 10:90 splitting ratio, and 90% in the downlink optical signal of the 2nd OLT port is from the output of the 2nd ONU port, and 10% from the output of the second tunable filter port, arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port 90% is from the output of the 2nd OLT port, and 10% from the output of the first tunable filter port, arrives the first tunable filter; It is 0.7dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
In technique scheme, the wave-length coverage of described the first tunable filter, the second tunable filter, the first photodetector, the second photodetector work is all between 1200 ~ 1700 nanometers.
Compared with prior art, advantage of the present invention is as follows:
(1) optical branching device of the present invention by one 2 * 2 is connected between OLT and the ONU, so that OLT, ONU are working properly; Filter out by 2 tunable filters and need to measure wavelength, realize light/electricity conversion through photodetector, through A/D converter realization mould/number conversion, then enter the CPU processing unit and process and compensate, at last the up-downgoing luminous power is presented on the display screen.The present invention is by 2 tunable filters, realize the selection of any wavelength of single fiber bi-directional in the PON system, broken through the restriction that to measure the fixed wave length luminous power, can in the PON of multi-wavelength system, carry out simultaneously the bi-directional light power measurement of any wavelength, be specially adapted to the novel optical access network of the various wavelength planning such as WDM PON system.
(2) because 2 tunable filters all have continuously adjustable characteristic, the present invention can also be implemented in the setting wave-length coverage of up-downgoing in the PON system and carry out spectral scan.
Description of drawings
Fig. 1 is the practical engineering application schematic diagram of the embodiment of the invention.
Fig. 2 is the structured flowchart of bi-directional light power-measuring device in the embodiment of the invention.
Among the figure: the 1-the two OLT port, the 2-the two ONU port, the 3-the first tunable filter port, the 4-the second tunable filter port.
Embodiment
The present invention is described in further detail below in conjunction with drawings and the specific embodiments.
Referring to shown in Figure 1, in practical engineering application, OLT connects a plurality of ONU by the passive light branch unit, when carrying out multi-wavelength passive optical network bi-directional light power measurement, the bi-directional light power-measuring device is connected between OLT and the ONU.
Referring to shown in Figure 2, the embodiment of the invention provides the power-measuring device of the bi-directional light in a kind of multi-wavelength passive optical network, comprise an OLT port, an ONU port, 2 * 2 optical branching devices, CPU processing unit, the first tunable filter, the first photodetector, the first A/D converter, the second tunable filter, the second photodetector, the second A/D converter, display screen, button, the bi-directional light power-measuring device links to each other with the terminal OLT device of outside by an OLT port, links to each other with the far-end ONU equipment of outside by an ONU port; 2 * 2 optical branching devices link to each other with an OLT port, an ONU port, the first tunable filter, the second tunable filter respectively; The first tunable filter links to each other with the first A/D converter by the first photodetector, the second tunable filter links to each other with the second A/D converter by the second photodetector, and the first tunable filter, the first A/D converter, the second tunable filter, the second A/D converter, display screen, button all link to each other with the CPU processing unit.
The following describes the function of each device.
2 * 2 optical branching devices are used for: adopt the mode of cross-over connection, the part downlink optical signal that OLT sends is introduced the second tunable filter, the part uplink optical signal that ONU sends is introduced the first tunable filter;
The first tunable filter is used for: under the control of CPU processing unit, filter, select the output of ONU uplink optical signal;
The first photodetector is used for: export after the ONU uplink optical signal of the first tunable filter input is converted to the signal of telecommunication;
The first A/D converter is used for: the signal of telecommunication to the input of the first photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The second tunable filter is used for: under the control of CPU processing unit, filter, select the output of OLT downlink optical signal;
The second photodetector is used for: export after the OLT downlink optical signal of the second tunable filter input is converted to the signal of telecommunication;
The second A/D converter is used for: the signal of telecommunication to the input of the second photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The CPU processing unit is used for control the first tunable filter and filters, selects the output of ONU uplink optical signal, controls the second tunable filter and filters, selects the output of OLT downlink optical signal; And the digital signal of the first A/D converter, the second A/D converter input carried out calculating and the compensation of luminous power, and the up-downgoing measuring light power result that will select wavelength outputs to display screen;
Button is used for: the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength of measurement are set;
Display screen is used for: the up-downgoing measuring light power result who shows configuration information and selected wavelength.
Referring to shown in Figure 2,2 * 2 optical branching devices comprise 4 ports: the 2nd OLT port one, the 2nd ONU port 2, the first tunable filter port 3, the second tunable filter port 4,2 * 2 optical branching devices link to each other with an OLT port by the 2nd OLT port one, realize that 2 * 2 optical branching devices are connected with OLT; Link to each other with an ONU port by the 2nd ONU port 2, realize that 2 * 2 optical branching devices are connected with ONU; 2 * 2 optical branching devices link to each other with the first tunable filter by the first tunable filter port 3, link to each other with the second tunable filter by the second tunable filter port 4.
On the basis of the bi-directional light power-measuring device in above-mentioned multi-wavelength passive optical network, the embodiment of the invention also provides the power measurement method of the bi-directional light in a kind of multi-wavelength passive optical network, may further comprise the steps:
S1, OLT the emission light signal bi-directional light power measurement:
Referring to shown in Figure 2, the light signal of OLT emission, be transferred to an OLT port of bi-directional light power-measuring device, optical fiber by this bi-directional light power-measuring device inside, be transferred to the 2nd OLT port one of 2 * 2 optical branching devices, then the part downlink optical signal is transferred to the second tunable filter from the second tunable filter port 4 of 2 * 2 optical branching devices; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set again, the second tunable filter filters, selects the OLT downlink optical signal under the control of CPU processing unit, outputs to the second photodetector; The second photodetector is converted to the signal of telecommunication with the OLT downlink optical signal of the second tunable filter input, output electrical signals is to the second A/D converter, the second A/D converter carries out mould/number conversion to the signal of telecommunication of the second photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the second A/D converter input, the descending measuring light power result who selectes wavelength is outputed to display screen show.
S2, ONU the emission light signal bi-directional light power measurement:
Referring to shown in Figure 2, the light signal of ONU emission, be transferred to an ONU port of bi-directional light power-measuring device, optical fiber by this bi-directional light power-measuring device inside, be transferred to the 2nd ONU port 2 of 2 * 2 optical branching devices, then the part uplink optical signal is transferred to the first tunable filter from the first tunable filter port 3 of 2 * 2 optical branching devices; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set again, the first tunable filter filters under the control of CPU processing unit, selects the ONU uplink optical signal, outputs to the first photodetector; After being converted to the signal of telecommunication, the ONU uplink optical signal that the first photodetector is inputted the first tunable filter outputs to the first A/D converter; The first A/D converter carries out mould/number conversion to the signal of telecommunication of the first photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the first A/D converter input, the up measuring light power result who selectes wavelength is outputed to display screen show.
In order to ensure the normal operation of OLT, ONU, and reduce as far as possible the bi-directional light power-measuring device and be connected across the insertion loss of introducing between OLT, the ONU, 2 * 2 optical branching devices adopt the splitting ratio of 5:95 or 10:90.2 * 2 optical branching devices have been realized the on-line testing of OLT, ONU, have guaranteed the realization of basic function.
When 2 * 2 optical branching devices adopt the splitting ratio of 5:95, the descending luminous power of the 2nd OLT port one 95% from 2 outputs of the 2nd ONU port, 5% luminous power arrives the second tunable filter from 4 outputs of the second tunable filter port; The up luminous power of the 2nd ONU port 2 95% from the 2nd OLT port one output, 5% luminous power arrives the first tunable filter from 3 outputs of the first tunable filter port.The bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU and is approximately 0.5dB, to reach the minimum purpose of OLT, ONU normal operation impact.
When 2 * 2 optical branching devices adopt the splitting ratio of 10:90, the descending luminous power of the 2nd OLT port one 90% from 2 outputs of the 2nd ONU port, 10% luminous power arrives the second tunable filter from 4 outputs of the second tunable filter port; The up luminous power of the 2nd ONU port 2 90% from the 2nd OLT port one output, 10% luminous power arrives the first tunable filter from 3 outputs of the first tunable filter port; The bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU and is approximately 0.7dB, to reach the minimum purpose of OLT, ONU normal operation impact.
In order to satisfy the requirement of optical access network measuring light power, all between 1200 ~ 1700 nanometers, precision satisfies the test needs to the wave-length coverage of the first tunable filter, the second tunable filter, the first photodetector, the second photodetector work.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention comprises these changes and modification interior.The content that is not described in detail in this specification belongs to the known prior art of this area professional and technical personnel.
Claims (10)
1. the bi-directional light power-measuring device in the multi-wavelength passive optical network, it is characterized in that: comprise an OLT port, an ONU port, 2 * 2 optical branching devices, CPU processing unit, the first tunable filter, the first photodetector, the first A/D converter, the second tunable filter, the second photodetector, the second A/D converter, display screen, button, described bi-directional light power-measuring device links to each other with the terminal OLT device of outside by an OLT port, links to each other with the far-end ONU equipment of outside by an ONU port; 2 * 2 optical branching devices link to each other with an OLT port, an ONU port, the first tunable filter, the second tunable filter respectively; The first tunable filter links to each other with the first A/D converter by the first photodetector, the second tunable filter links to each other with the second A/D converter by the second photodetector, the first tunable filter, the first A/D converter, the second tunable filter, the second A/D converter, display screen, button all link to each other with the CPU processing unit, wherein:
2 * 2 optical branching devices are used for: adopt the mode of cross-over connection, the part downlink optical signal that OLT sends is introduced the second tunable filter, the part uplink optical signal that ONU sends is introduced the first tunable filter;
The first tunable filter is used for: under the control of CPU processing unit, filter, select the output of ONU uplink optical signal;
The first photodetector is used for: export after the ONU uplink optical signal of the first tunable filter input is converted to the signal of telecommunication;
The first A/D converter is used for: the signal of telecommunication to the input of the first photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The second tunable filter is used for: under the control of CPU processing unit, filter, select the output of OLT downlink optical signal;
The second photodetector is used for: export after the OLT downlink optical signal of the second tunable filter input is converted to the signal of telecommunication;
The second A/D converter is used for: the signal of telecommunication to the input of the second photodetector carries out mould/number conversion, and the digital signal that obtains is outputed to the CPU processing unit;
The CPU processing unit is used for control the first tunable filter and filters, selects the output of ONU uplink optical signal, controls the second tunable filter and filters, selects the output of OLT downlink optical signal; And the digital signal of the first A/D converter, the second A/D converter input carried out calculating and the compensation of luminous power, and the up-downgoing measuring light power result that will select wavelength outputs to display screen;
Button is used for: the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength of measurement are set;
Display screen is used for: show configuration information and measuring light power information.
2. the bi-directional light power-measuring device in the multi-wavelength passive optical network as claimed in claim 1, it is characterized in that: described 2 * 2 optical branching devices comprise 4 ports: the 2nd OLT port (1), the 2nd ONU port (2), the first tunable filter port (3), the second tunable filter port (4), described 2 * 2 optical branching devices link to each other with an OLT port by the 2nd OLT port (1), realize that 2 * 2 optical branching devices are connected with OLT; Link to each other with an ONU port by the 2nd ONU port (2), realize that 2 * 2 optical branching devices are connected with ONU; 2 * 2 optical branching devices link to each other with the first tunable filter by the first tunable filter port (3), link to each other with the second tunable filter by the second tunable filter port (4).
3. the bi-directional light power-measuring device in the multi-wavelength passive optical network as claimed in claim 1, it is characterized in that: described 2 * 2 optical branching devices adopt the splitting ratio of 5:95, in the downlink optical signal of the 2nd OLT port (1) 95% exported from the 2nd ONU port (2), 5% from the output of the second tunable filter port (4), arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port (2) 95% is from the output of the 2nd OLT port (1), and 5% from the output of the first tunable filter port (3), arrives the first tunable filter; It is 0.5dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
4. the bi-directional light power-measuring device in the multi-wavelength passive optical network as claimed in claim 1, it is characterized in that: described 2 * 2 optical branching devices adopt the splitting ratio of 10:90, in the downlink optical signal of the 2nd OLT port (1) 90% exported from the 2nd ONU port (2), 10% from the output of the second tunable filter port (4), arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port (2) 90% is from the output of the 2nd OLT port (1), and 10% from the output of the first tunable filter port (3), arrives the first tunable filter; It is 0.7dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
5. such as the bi-directional light power-measuring device in each described multi-wavelength passive optical network in the claim 1 to 4, it is characterized in that: the wave-length coverage of described the first tunable filter, the second tunable filter, the first photodetector, the second photodetector work is all between 1200 ~ 1700 nanometers.
6. one kind based on the bi-directional light power measurement method in the multi-wavelength passive optical network of each described bi-directional light power-measuring device in the claim 1 to 5, it is characterized in that, may further comprise the steps:
The optical signal transmission of S1, OLT emission is to an OLT port of bi-directional light power-measuring device, Optical Fiber Transmission to 2 by this bi-directional light power-measuring device inside * 2 optical branching devices is transferred to the second tunable filter through 2 * 2 optical branching device rear section downlink optical signals; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set, the second tunable filter filters under the control of CPU processing unit, selects the OLT downlink optical signal, outputs to the second photodetector; After being converted to the signal of telecommunication, the OLT downlink optical signal that the second photodetector is inputted the second tunable filter outputs to the second A/D converter, the second A/D converter carries out mould/number conversion to the signal of telecommunication of the second photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the second A/D converter input, the descending measuring light power result who selectes wavelength is outputed to display screen show;
The optical signal transmission of S2, ONU emission is to an ONU port of bi-directional light power-measuring device, Optical Fiber Transmission to 2 by this bi-directional light power-measuring device inside * 2 optical branching devices is transferred to the first tunable filter through 2 * 2 optical branching device rear section uplink optical signals; By button the mode of operation of wavelength light power measurement or up-downgoing spectral scan, the wavelength that need measure are set, the first tunable filter filters under the control of CPU processing unit, selects the ONU uplink optical signal, outputs to the first photodetector; After being converted to the signal of telecommunication, the ONU uplink optical signal that the first photodetector is inputted the first tunable filter outputs to the first A/D converter; The first A/D converter carries out mould/number conversion to the signal of telecommunication of the first photodetector input, and the digital signal that obtains is outputed to the CPU processing unit; The CPU processing unit carries out calculating and the compensation of luminous power to the digital signal of the first A/D converter input, the up measuring light power result who selectes wavelength is outputed to display screen show.
7. the bi-directional light power measurement method in the multi-wavelength passive optical network as claimed in claim 6, it is characterized in that: described 2 * 2 optical branching devices comprise 4 ports: the 2nd OLT port (1), the 2nd ONU port (2), the first tunable filter port (3), the second tunable filter port (4), described 2 * 2 optical branching devices link to each other with an OLT port by the 2nd OLT port (1), realize that 2 * 2 optical branching devices are connected with OLT; Link to each other with an ONU port by the 2nd ONU port (2), realize that 2 * 2 optical branching devices are connected with ONU; 2 * 2 optical branching devices link to each other with the first tunable filter by the first tunable filter port (3), link to each other with the second tunable filter by the second tunable filter port (4); The light signal of described OLT emission is through the 2nd OLT port (1) of an OLT port transmission to 2 * 2 optical branching devices, and then the second tunable filter port (4) from 2 * 2 optical branching devices is transferred to the second tunable filter; The light signal of ONU emission is transferred to the 2nd ONU port (2) of 2 * 2 optical branching devices through an ONU port transmission to 2 * 2 optical branching devices, and then the first tunable filter port (3) from 2 * 2 optical branching devices is transferred to the first tunable filter.
8. the bi-directional light power measurement method in the multi-wavelength passive optical network as claimed in claim 6, it is characterized in that: described 2 * 2 optical branching devices adopt the splitting ratio of 5:95, in the downlink optical signal of the 2nd OLT port (1) 95% exported from the 2nd ONU port (2), 5% from the output of the second tunable filter port (4), arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port (2) 95% is from the output of the 2nd OLT port (1), and 5% from the output of the first tunable filter port (3), arrives the first tunable filter; It is 0.5dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
9. the bi-directional light power measurement method in the multi-wavelength passive optical network as claimed in claim 6, it is characterized in that: described 2 * 2 optical branching devices adopt the 10:90 splitting ratio, in the downlink optical signal of the 2nd OLT port (1) 90% exported from the 2nd ONU port (2), 10% from the output of the second tunable filter port (4), arrives the second tunable filter; In the uplink optical signal of the 2nd ONU port (2) 90% is from the output of the 2nd OLT port (1), and 10% from the output of the first tunable filter port (3), arrives the first tunable filter; It is 0.7dB that described bi-directional light power-measuring device is connected across the insertion loss of introducing between OLT, the ONU.
10. such as the bi-directional light power measurement method in each described multi-wavelength passive optical network in the claim 6 to 9, it is characterized in that: the wave-length coverage of described the first tunable filter, the second tunable filter, the first photodetector, the second photodetector work is all between 1200 ~ 1700 nanometers.
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