CN114374902A - Calibration and test method for burst mode light receiving power RSSI of OLT light module - Google Patents
Calibration and test method for burst mode light receiving power RSSI of OLT light module Download PDFInfo
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Abstract
The invention discloses a calibration and test method of burst mode light receiving power RSSI of an xGPON OLT optical module, belonging to the technical field of calibration and test of burst mode light receiving power RSSI, which comprises the following steps: s1, using a phase-locked loop frequency synthesizer chip to generate a modulation signal required by the ONU optical module; s2, using a complex programmable logic device CPLD to output TxBEN to the ONU optical module, outputting TRIGGER to the OLT optical module and outputting I2C bus to access the register of the OLT optical module; s3, the PC carries out data communication through a serial port UART and a CPLD; s4, designing an RSSI _ Gen entity in the CPLD; and S5, automatically calibrating the software. The invention has the beneficial effects that: the RSSI detection of the OLT optical module to the burst uplink optical packet of the ONU optical module is realized on an RSSI burst time sequence test board by a low-cost solution, the precision of the OLT optical module under different RSSI burst time sequences can be comprehensively evaluated, and the dependence on imported equipment can be reduced in the batch production process.
Description
Technical Field
The invention relates to the technical field of calibration and test of burst mode light receiving power RSSI, in particular to a method for calibrating and testing burst mode light receiving power RSSI of an OLT (optical line terminal) optical module.
Background
The optical module is composed of photoelectronic devices, an optical interface chip, a microprocessor and the like on hardware, so that the main function of photoelectric conversion of the optical module is realized, namely, an optical transmitter modulates an electric signal into an optical signal, and the optical signal is transmitted through an optical fiber and then is demodulated into the electric signal by an optical receiver; to implement a point-to-multipoint optical communication mode, which is unique to Passive Optical Networks (PONs), one OLT optical module may have as many as 256 ONU optical modems for remote subscribers. The downlink of the OLT equipment is in a Time Division Multiplexing (TDM) broadcast mode, all ONU optical modems can receive the same data packet, and each ONU optical modem only analyzes the data packet containing the logical link digital identification LLID of the ONU optical modem. During the registration of the ONU optical modem on the network for the first time, the OLT equipment allocates the packet length and the time slot of an uplink optical packet to each ONU optical modem newly connected to the network, and each ONU optical modem adopts burst Time Division Multiple Access (TDMA) for uplink, which means that the uplink optical signal of each ONU optical modem is not continuously luminous all the time, but is burst luminous only at a point and finishes the luminous within a specified time.
With reference to the RSSI burst timing chart of fig. two, it is explained how the burst mode optical receiver of the OLT optical module implements the RSSI function.
In the BEN pulse signal in the RSSI burst timing diagram, the default is that the ONU optical module emits light when BEN is set to 1 or the ONU optical module does not emit light when BEN is set to 0. When light of the ONU optical module is transmitted and attenuated to irradiate an avalanche photodiode of the OLT optical module, an APD photocurrent Iapd is formed, and a voltage pulse is formed through a current mirror chip. When the TRIGGER pulse is effective, the sampling and protecting chip enters a sampling mode, after the falling edge of the TRIGGER pulse, the microprocessor is triggered to sample the output voltage of the sampling and protecting chip, and the input optical power is calculated as RSSI and put in a register which can be accessed by I2C.
The conventional calibration and test mode of burst mode light receiving power RSSI is as follows: the pulse generator 81104A produced by Agilent company is adopted to generate TxBEN and TRIGGER time sequences with high precision and high correlation by programming, and the method has the advantages of simple implementation method and the defect that the unit price of imported equipment is too high, and the method is only suitable for scientific research and is not suitable for batch production; two I/O ports of the MCU are adopted for programming, one I/O port is used as a TxBEN signal to be input into the ONU optical module, and the other I/O port is used as a TRIGGER signal to be input into the OLT optical module.
Disclosure of Invention
The present invention is directed to provide a method for calibrating and testing the burst mode optical receive power RSSI of an OLT optical module, so as to solve the problems mentioned in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the calibration and test method of the burst mode light receiving power RSSI of the OLT light module specifically comprises the following steps:
s1, generating a modulation signal required by the ONU optical module by using a phase-locked loop frequency synthesizer chip;
s2, outputting two TxBENs to two ONU optical modules by using one complex programmable logic device CPLD, outputting TRIGGER to one OLT optical module and outputting I2C bus to access the register of the OLT optical module;
s3, the PC carries out data communication through the serial port UART and the CPLD;
s4, designing an RSSI _ Gen entity in the CPLD, wherein the RSSI _ Gen entity is a logic circuit of a synchronous counter and a synchronous comparator;
s5, the RSSI calibration steps are as follows: firstly setting a CPLD to a continuous mode and enabling a TxBEN to force an ONU optical module to emit light, secondly adjusting the attenuation of an optical attenuator to output light with different light intensities to an OLT optical module, then switching the CPLD to an RSSI burst mode, outputting TxBEN pulses to enable the ONU optical module to emit burst light packets and synchronously outputting TRIGGER pulses to enable the OLT optical module to enter an RSSI sampling mode, and finally reading back an RSSI sampling value through an I2C bus and forming a lookup table with an actual input light power value, so that the OLT optical module can detect any input light power in a table lookup mode.
As a further scheme of the invention: the phase-locked loop Frequency Synthesizer chip in the step S1 is set as a PLL Frequency Synthesizer chip.
As a still further scheme of the invention: the user can adjust the RSSI timing on the PC by UART presetting the Tonu Tw and Td registers,
the Tonu is a light emitting time length of the ONU optical module in the burst mode, and is configured to make the ONU optical module light emitting time length Tonu equal to (BEN _ reg2-BEN _ reg1) a counter clock period by configuring BEN _ reg1 equal to 1 and BEN _ reg2 equal to 24;
the Tw is a TRIGGER pulse effective duration, which is configured to make the TRIGGER pulse duration Tw (TRG _ reg2-TRG _ reg1) be a counter clock period by configuring TRG _ reg1 to 11 and TRG _ reg2 to 20;
td is the delay time duration of the rising edge of TRIGGER lagging the rising edge of BEN, and is (TRG _ reg1-BEN _ reg1) the counter clock period.
As a still further scheme of the invention: when the RSSI of a GPON OLT optical module or an EPON OLT optical module with only one optical wavelength receiver is calibrated or tested, one ONU optical module is used as a burst mode light source, the GPON ONU optical module or the EPON ONU optical module is inserted into an ONU1 slot, the ONU2 slot is suspended, a TRGBEN _ mode _ reg (01) is configured to enable a TRIGGER and a TxBEN to be linked, an RSSIcon _ reg (7..6) is configured to enable the TRIGGER to be linked with the TxBEN1 only but not linked with the TxBEN2, and an RSSI _ start _ reg (1) is configured to play a TRIGGER and TxBEN1 linkage timing sequence, namely, the CPLD outputs a TRIGGER pulse to the GPON OLT optical module or the EPON OLT optical module, and outputs a TxBEN1 pulse to the EPON OLT optical module or the EPON optical module.
As a still further scheme of the invention: for a 10GEPON OLT optical module with two optical wavelength receivers, since the 10GEPON OLT optical module is an APD optical receiver capable of receiving ONU light with two wavelengths, 1310 and 1270, two ONU optical modules are required as burst mode light sources, where the burst mode light sources include an EPON ONU optical module emitting 1310 wavelength and a 10GEPON ONU optical module emitting 1270 wavelength, the EPON ONU optical module is inserted into an ONU1 slot, a 10GEPON ONU optical module is inserted into an ONU2 slot, and a CPLD needs to generate a TRIGGER signal to the 10GEPON OLT optical module, generate a TxBEN1 signal to the EPON ONU optical module emitting 1310 wavelength, and generate a TxBEN2 signal to the 10GEPON ONU optical module emitting 1270 wavelength.
As a still further scheme of the invention: the conditional augmentation comprises: in calibrating or testing the 1310 wavelength RSSI of the 10GEPON OLT optical module, the TRIGGER of the 10GEPON OLT optical module and the TxBEN1 of the EPON ONU optical module are required to be linked, at the moment, the 10GEPON ONU optical module with the 1270 wavelength is forbidden to emit light, only the EPON ONU optical module with the 1310 wavelength is enabled to emit light in a burst mode, BEN2_ LEVEL _ reg is required to be configured to be 1', for making the 1270 wavelength 10GEPON ONU optical module emit no light in the level mode, TRGBEN _ mode _ reg is configured to be "01", configured to link TRIGGER and TxBEN, RSSIcon _ reg (7..6) '01', for allowing the TRIGGER to be linked only with TxBEN1 and not with TxBEN2, and finally configuring RSSI _ start _ reg to be 1 to make a linkage timing of TRIGGER and TxBEN1, namely, the CPLD outputs a TRIGGER pulse to the 10GEPON OLT optical module to make it enter the RSSI sampling mode, simultaneously, a TxBEN1 pulse is output to an ONU1 slot to enable an EPON ONU optical module to emit light in a burst mode, meanwhile, the output TxBEN2 is constantly 1 to the ONU2 slot, so that the 10GEPON ONU optical module does not emit light.
As a still further scheme of the invention: the conditional augmentation comprises: in calibrating or testing the 1270 wavelength RSSI of the 10GEPON OLT optical module, the TRIGGER of the 10GEPON OLT optical module and the TxBEN2 of the 10GEPON ONU optical module are required to be linked, at the moment, the EPON ONU optical module with the wavelength of 1310 is forbidden to emit light, only the 10GEPON ONU optical module with the wavelength of 1270 is enabled to emit light in a burst mode, BEN1_ LEVEL _ reg is configured to be 1', for making the 1310 wavelength EPON ONU optical module emit no light in the level mode, TRGBEN _ mode _ reg is configured to be "01", for linking TRIGGER and TxBEN, RSSIcon _ reg (7..6) '10', for allowing the TRIGGER to be linked only with TxBEN2 and not with TxBEN1, and finally configuring RSSI _ start _ reg to be 1 to make a linkage timing of TRIGGER and TxBEN2, namely, the CPLD outputs a TRIGGER pulse to the 10GEPON OLT optical module to make it enter the RSSI sampling mode, simultaneously, a TxBEN2 pulse is output to an ONU2 slot to enable the 10GEPON ONU optical module to emit light in a burst mode, and meanwhile, the output TxBEN1 is constantly 1 to an ONU1 slot, so that the EPON ONU optical module does not emit light.
As a still further scheme of the invention: for the XGSPON Combo OLT module with two optical wavelength receivers, since the XGS-PON Combo OLT module is two independent APD optical receivers capable of receiving ONU light with two wavelengths, 1310 and 1270, two ONU optical modules are required to be used as burst mode light sources, the burst mode light sources include a GPON ONU optical module emitting 1310 wavelength and an XGSPON ONU optical module emitting 1270 wavelength, the GPON ONU optical module is inserted into the ONU1 slot, the XGSPON ONU optical module is inserted into the ONU2 slot, and the CPLD needs to generate a TRIGGER signal for providing to the XGSPON optical module OLT, generate a TxBEN1 signal for providing to the GPON ONU optical module emitting 1310 wavelength, and generate a TxBEN2 signal for providing to the XGSPON ONU optical module emitting 1270 wavelength.
As a still further scheme of the invention: the conditional augmentation comprises: when the RSSI of 1310 and 1270 wavelengths of the XGSPON OLT optical module is calibrated or tested, the TRIGGER of the XGSPON OLT optical module and the TxBEN1 of the GPON ONU optical module are required to be simultaneously linked with the TxBEN2 of the XGSPON ONU optical module, rsscon _ reg (7..6) × 11 "is required to be configured for enabling the TRIGGER to be simultaneously linked with the TxBEN1 and the TxBEN2, and finally RSSI _ start _ reg ═ 1" is configured to set a linkage timing of the TRIGGER and the TxBEN1, namely, the CPLD outputs a TRIGGER pulse to the XGSPON OLT optical module to enable the XGSPON OLT optical module to enter an RSSI sampling mode, and outputs a TxBEN1 pulse to the ONU1 slot to enable the GPON ONU optical module to emit light in a burst mode, and outputs a TxBEN2 pulse to the ONU2 to enable the XGSPON ONU optical module to emit light in a burst mode.
Compared with the prior art, the invention has the beneficial effects that: 1. the RSSI detection of the burst uplink optical packet of the ONU optical module by 2 OLT optical modules is realized on one RSSI burst time sequence test board by a low-cost solution, the precision of the OLT optical modules under different RSSI burst time sequences can be comprehensively evaluated, and the dependence on imported equipment can be reduced in the batch production process;
2. the modulation signal required by the ONU optical module is generated by only using a phase-locked loop Frequency Synthesizer PLL Frequency Synthesizer chip, TxBEN is output to the ONU optical module by using a complex programmable logic device CPLD, TRIGGER is output to the OLT optical module, and I2C bus is output to access the register of the OLT optical module. The PC carries out data communication through a serial port UART and a CPLD, and is realized by programming, so that the method is suitable for batch production, and can accurately control the time sequence relation between the TxBEN and the TRIGGER and realize ns-level resolution;
3. because a phase-locked loop Frequency Synthesizer PLL Frequency Synthesizer chip is used for generating a modulation signal required by the ONU optical module, and a complex programmable logic device CPLD is used for outputting TxBEN to the ONU optical module, the hardware is simple, the price is cheaper than that of the traditional mode, the use cost is saved, the realization is simple, and the operation is convenient.
Drawings
Fig. 1 is a block diagram of an RSSI burst timing test of an OLT optical module according to the present invention;
fig. 2 is a diagram of CPLD source code combined timing simulation provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The interpretation of the relevant terms referred to in this application is: passive Optical Network (PON), Time Division Multiplexing (TDM).
Referring to fig. 1-2, in an embodiment of the present invention, a method for calibrating and testing a burst mode optical receiving power RSSI of an OLT optical module specifically includes the following steps: s1, generating a modulation signal required by the ONU optical module by using a phase-locked loop Frequency Synthesizer chip, in this embodiment, the phase-locked loop Frequency Synthesizer chip is a PLL Frequency Synthesizer chip, S2, outputting two TxBEN paths to two ONU optical modules by using a complex programmable logic device CPLD, outputting TRIGGER to one OLT optical module and outputting I2C bus to access a register of the OLT optical module; s3, the PC carries out data communication through a serial port UART and a CPLD, S4, an RSSI _ Gen entity is designed in the CPLD, the RSSI _ Gen entity is essentially a logic circuit of a synchronous counter and a synchronous comparator, and the method comprises the step S5, which is a step aiming at calibrating the RSSI, so that the calibration and the test of the RSSI of the burst mode light receiving power RSSI of the OLT optical module in the volume of the application can be realized, wherein the RSSI calibration step is as follows: firstly setting a CPLD to a continuous mode and enabling a TxBEN to force an ONU optical module to emit light, secondly adjusting the attenuation of an optical attenuator to output light with different light intensities to an OLT optical module, then switching the CPLD to an RSSI burst mode, outputting TxBEN pulses to enable the ONU optical module to emit burst light packets and synchronously outputting TRIGGER pulses to enable the OLT optical module to enter an RSSI sampling mode, and finally reading back an RSSI sampling value through an I2C bus and forming a lookup table with an actual input light power value, so that the OLT optical module can detect any input light power in a table lookup mode.
The programming for the RSSI _ Gen entity described above is as follows:
in the above-mentioned program entity, the program entity,
the CLOCK _ buf adopts an external 200M crystal oscillator CLOCK;
RSSI _ start _ reg is a 1-bit software register value sent by the PC through the UART;
BEN _ RSSI _ reg1 and BEN _ RSSI _ reg2 are 2 8-bit software register values sent by the PC through the UART;
TRG _ RSSI _ reg1 and TRG _ RSSI _ reg2 are 2 8-bit software register values sent by the PC through the UART;
BEN _ RSSI _ buf and TRG _ RSSI _ buf are intermediate register values of TxBEN and TRIGGER, respectively;
as a further embodiment of the present application, please refer to fig. 1 and fig. 2, wherein in order to implement the above functions, it is necessary to fully interpret the CPID in combination with the source code, that is, the user can preset Tonu, Tw and Td registers on the PC to adjust the RSSI timing through the UART, and in the program, BEN _ reg1 is specifically preset to 1 and BEN _ reg2 is preset to 25; TRG _ reg1 is 11 and TRG _ reg2 is 21, where Td is the time during which the rising edge of TRIGGER lags behind the rising edge of TxBEN, and Tw is the time during which TRIGGER is high, i.e., the time during which TRIGGER is high
Tonu is the light emitting time length of the ONU optical module in the burst mode, and the ONU optical module light emitting time length Tonu may be (BEN _ reg2-BEN _ reg1) by configuring BEN _ reg1 to be 1 and BEN _ reg2 to be 24;
tw is the TRIGGER pulse effective duration, and the TRIGGER pulse duration Tw may be (TRG _ reg2-TRG _ reg1) a counter clock period by configuring TRG _ reg1 to be 11 and TRG _ reg2 to be 20;
td is the delay time duration for the rising edge of TRIGGER to lag the rising edge of TxBEN, and is (TRG _ reg1-BEN _ reg1) times the counter clock period.
As a further embodiment of the present application, please refer to fig. 1 and 2, wherein when the RSSI of the GPON OLT optical module or EPON OLT optical module with only one optical wavelength receiver is calibrated or tested, one ONU optical module is used as a burst-mode light source, and the GPON ONU optical module or EPON ONU optical module is inserted into an ONU1 slot, wherein the ONU2 slot is suspended, and by configuring TRGBEN _ mode _ reg as "01" (even though TRIGGER and TxBEN are linked), configuring rsscon _ reg (7..6) as "01" (even though TRIGGER is linked with TxBEN1 only and is not linked with TxBEN 2), configuring _ start _ reg as "1" to make a timing sequence of the TRIGGER linked with TxBEN1, that is, CPLD outputs a TRIGGER pulse to the GPON OLT optical module or EPON ONU optical module, and outputs a RSSI pulse to the GPON OLT optical module or EPON ONU optical module 1;
however, for the 10GEPON OLT optical module having two optical wavelength receivers, since the 10GEPON OLT is an APD optical receiver capable of receiving ONU light having two wavelengths, respectively, 1310 wavelength and 1270 wavelength, two ONU optical modules (one EPON ONU optical module emitting 1310 wavelength and one 10GEPON ONU optical module emitting 1270 wavelength) are required to be used as burst mode light sources, that is, the EPON ONU optical module is inserted into the ONU1 slot, the 10GEPON ONU optical module is inserted into the ONU2 slot, and the CPLD needs to generate a TRIGGER signal to the 10GEPON OLT optical module, generate a TxBEN1 signal to the EPON ONU optical module emitting 1310 wavelength, generate a TxBEN2 signal to the 10GEPON ONU optical module emitting 1270 wavelength, that is, the TRIGGER signal to the 10GEPON optical module and the TxBEN signal to the two ONU optical modules emitting two wavelengths, respectively, are controlled separately, and the APD optical module of the 10GEPON is an APD optical module, responsivities of upstream light with 1310 wavelength and upstream light with 1270 wavelength are different, so that RSSI calibration coefficients of the two wavelengths in the 10GEPON OLT optical module are different, and the CPLD code needs to be conditionally expanded.
As a further embodiment of the present application, please refer to fig. 1 and 2, wherein the condition expansion includes two additions, one of which is that when calibrating or testing the 1310-wavelength RSSI of the 10GEPON OLT optical module, TRIGGER of the 10GEPON OLT optical module and TxBEN1 of the EPON ONU optical module are required to be linked, at which moment the 1270-wavelength 10GEPON ONU optical module is prohibited from emitting light and only the 1310-wavelength EPON ONU optical module is enabled to emit light in a burst mode, BEN2_ LEVEL _ reg "1" (even if the 1270-wavelength 10GEPON optical module does not emit light in a LEVEL mode), TRGBEN _ mode _ reg "01" (even if TRIGGER and TxBEN are linked), rsscon _ reg (7..6) "01" (even if TRIGGER is linked with TxBEN1 but not with TxBEN 2), and finally RSSI _ start "1" is configured to be linked with TxBEN1 and make a sampling pulse enter a sampling mode, namely, TRIGGER pulse 1 is output to CPLD, simultaneously, outputting a TxBEN1 pulse to an ONU1 slot to enable the EPON ONU optical module to emit light in a burst mode, and simultaneously outputting TxBEN2 constant to be 1 to an ONU2 slot to enable the 10GEPON ONU optical module not to emit light; another method is that when calibrating or testing 1270 wavelength RSSI of 10GEPON OLT optical module, TRIGGER of 10GEPON OLT optical module and TxBEN2 of 10GEPON ONU optical module are required to be linked, at this moment, EPON ONU optical module of 1310 wavelength is prohibited from emitting light and only 10GEPON ONU optical module of 1270 wavelength is enabled to emit light in burst, BEN1_ LEVEL _ reg is required to be configured as "1" (even though EPON ONU optical module of 1310 wavelength does not emit light in LEVEL mode), TRGBEN _ mode _ reg is configured as "01" (even though TRIGGER and TxBEN are linked), RSSIcon _ reg (7..6) "10" (even though TRIGGER is linked with TxBEN2 only and not TxBEN 1), and finally RSSI _ start _ reg is configured as "1" to make a TRIGGER linked with TxBEN2, namely, a TRIGGER pulse is output to TRIGGER 10 RSSI of 10GEPON OLT, and simultaneously make the GEPON ONU optical module emit light in burst mode 46 2, and meanwhile, the output TxBEN1 is constantly 1 to an ONU1 slot, so that the EPON ONU optical module does not emit light.
Another conditional expansion further comprises: when the RSSI of 1310 and 1270 wavelengths of the XGSPON OLT optical module is calibrated or tested, the TRIGGER of the XGSPON OLT optical module and the TxBEN1 of the GPON ONU optical module are required to be linked with the TxBEN2 of the XGSPON ONU optical module at the same time, rsscon _ reg (7..6) × 11 "is required to be configured for enabling the TRIGGER to be linked with the TxBEN1 and the TxBEN2 at the same time, and finally RSSI _ start _ reg ═ 1" is configured to make a linkage timing of the TRIGGER and the TxBEN1, that is, the CPLD outputs a TRIGGER pulse to the XGSPON OLT optical module to enable the XGSPON OLT optical module to enter an RSSI sampling mode, and outputs a TxBEN1 pulse to the ONU1 to enable the GPON ONU optical module to emit light in a burst mode, and outputs a TxBEN1 pulse to the ONU2 to enable the XGSPON ONU optical module to emit light in a burst mode. In this embodiment, for the XGSPON Combo OLT optical module having two optical wavelength receivers, since the XGS-PON Combo OLT optical module is two independent APD optical receivers capable of receiving ONU light with two wavelengths, 1310 and 1270, two ONU optical modules are required as burst mode light sources, the burst mode light source includes a GPON ONU optical module emitting 1310 wavelength and an XGSPON ONU optical module emitting 1270 wavelength, a GPON ONU optical module is inserted into the ONU1 slot, an XGSPON ONU optical module is inserted into the ONU2 slot, and the CPLD is required to generate TRIGGER signal for providing to the XGSPON OLT optical module, generate TxBEN1 signal for providing to the GPON ONU optical module emitting wavelength 1310, and generate TxBEN2 signal for providing to the XGSPON ONU optical module emitting 1270 wavelength.
The above program code is explained in which TxBEN and TRIGGER are in Level mode (user can set 1 or clear 0 at will) when the user programmable 2bit TRGBEN _ mode _ reg is "00", TxBEN and TRIGGER are in Tinming mode (associated with the counter as described above) when "01", but RSSIcon _ reg (7) '1', BEN2_ temp are counter related pulses and can switch polarity, otherwise Level mode is maintained, but RSSIcon _ reg (6) '1', BEN1_ temp are counter related pulses and can switch polarity, otherwise Level mode is maintained. In the application, the adopted xGPON OLT optical module generally refers to a series of OLT optical modules which follow IEEE and ITU-T passive optical network protocol clusters, such as EPON, 10GEPON, GPON, XGPON, XGSPON, NGPON2 and the like, and the most widely deployed optical modules such as the GPON OLT, 10GEPON OLT, XGSPON OLT and the like are illustrated as representatives.
In a specific use scenario, the following scenarios are classified:
the application scene one: if the user wants the ONU2 optical module with 1270 wavelength to emit light constantly (BEN1_ LEVEL _ reg is "0"), the ONU1 optical module with 1310 wavelength does not emit light (BEN1_ LEVEL _ reg is "1"), the TRIGGER "simultaneously sets RSSIcon _ reg (7..6) to" 00", and then the implementation is realized;
application scenario two: if a user wants to link the ONU1 optical module with the 1310 wavelength and the TRIGGER of the EPON OLT optical module, the ONU1 optical module with the 1310 wavelength is not made to emit light (BEN1_ LEVEL _ reg is equal to "1"), and then a TRIGGER is added to the EPON OLT optical module (RSSIcon _ reg (1..0) is required to be equal to "01", and RSSIcon _ reg (7..6) is equal to "01"), so that the method is realized;
application scenario three: if a user wants to link together only the ONU2 optical module with 1270 wavelength and the TRIGGER of the 10GEPON OLT optical module, the ONU2 optical module with 1270 wavelength is not made to emit light (BEN2_ LEVEL _ reg is "1") and the ONU1 optical module with 1310 wavelength is not made to emit light (BEN1_ LEVEL _ reg is "1"), and then one TRIGGER is added to the 10GEPON OLT optical module (RSSIcon _ reg (1..0) '01' is required and RSSIcon _ reg (7..6) '10' is required), so that the method is realized.
And an application scene four: if a user wants the ONU2 optical module with 1270 wavelength and the ONU1 optical module with 1310 wavelength to be simultaneously linked with the TRIGGER of the XGSPON OLT optical module, the ONU2 optical module with 1270 wavelength is not made to emit light (BEN2_ LEVEL _ reg is "1") and the ONU1 optical module with 1310 wavelength is not made to emit light (BEN1_ LEVEL _ reg is "1"), and then a TRIGGER is applied to the XGSPON OLT optical module (rsscon _ reg (1..0) '01' and rsscon _ reg (7..6) '11' are required), so that the purpose is achieved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (9)
- The method for calibrating and testing the burst mode light receiving power RSSI of the OLT light module is characterized by comprising the following steps:s1, generating a modulation signal required by the ONU optical module by using a phase-locked loop frequency synthesizer chip;s2, outputting two TxBENs to two ONU optical modules by using one complex programmable logic device CPLD, outputting TRIGGER to one OLT optical module and outputting I2C bus to access the register of the OLT optical module;s3, the PC carries out data communication through the serial port UART and the CPLD;s4, designing an RSSI _ Gen entity in the CPLD, wherein the RSSI _ Gen entity is a logic circuit of a synchronous counter and a synchronous comparator;s5, the RSSI calibration steps are as follows: firstly setting a CPLD to a continuous mode and enabling a TxBEN to force an ONU optical module to emit light, secondly adjusting the attenuation of an optical attenuator to output light with different light intensities to an OLT optical module, then switching the CPLD to an RSSI burst mode, outputting TxBEN pulses to enable the ONU optical module to emit burst light packets and synchronously outputting TRIGGER pulses to enable the OLT optical module to enter an RSSI sampling mode, and finally reading back an RSSI sampling value through an I2C bus and forming a lookup table with an actual input light power value, so that the OLT optical module can detect any input light power in a table lookup mode.
- 2. The method of claim 1, wherein the phase-locked loop Frequency Synthesizer chip in step S1 is configured as a PLL Frequency Synthesizer chip.
- 3. The method of claim 1, wherein the RSSI timing can be adjusted by a user on a PC via UART default Tonu, Tw and Td registers,the Tonu is a light emitting time length of the ONU in the burst mode, and is configured to make the ONU light emitting time length Tonu (BEN _ reg2-BEN _ reg1) equal to a counter clock period by configuring BEN _ reg1 equal to 1 and BEN _ reg2 equal to 24;the Tw is a TRIGGER pulse effective duration, which is configured to make the TRIGGER pulse duration Tw (TRG _ reg2-TRG _ reg1) be a counter clock period by configuring TRG _ reg1 to 11 and TRG _ reg2 to 20;td is the delay time duration of the rising edge of TRIGGER lagging the rising edge of BEN, and is (TRG _ reg1-BEN _ reg1) the counter clock period.
- 4. The method of claim 1, wherein when calibrating or testing the RSSI of the GPON OLT module or the EPON OLT module having only one optical wavelength receiver, one ONU optical module is used as a burst-mode light source, the GPON ONU optical module or the EPON ONU optical module is inserted into the ONU1 slot, the ONU2 slot is suspended, TRGBEN _ mode _ reg "01" is configured to link the TRIGGER and the TxBEN, rsscon _ reg (7..6) "01" is configured to link the TRIGGER only with the TxBEN1 and not with the TxBEN2, and RSSI _ start _ reg "1" is configured to set a timing for linking the TRIGGER with the TxBEN1, that is, the CPLD outputs a TRIGGER pulse to the GPON OLT or the EPON OLT, and outputs a TxBEN pulse 1 to the EPON OLT or the EPON ONU optical module.
- 5. The method of claim 1, wherein for a 10GEPON OLT optical module having two optical wavelength receivers, since the 10GEPON OLT optical module is an APD optical receiver capable of receiving ONU light with two wavelengths, 1310 and 1270, two ONU optical modules are required as burst-mode light sources, the burst-mode light sources include an EPON ONU optical module emitting 1310 wavelength and a 10GEPON ONU optical module emitting 1270 wavelength, an EPON ONU optical module is inserted into an ONU1 slot, a 10GEPON ONU is inserted into an ONU2 slot, and a CPLD is required to generate TRIGGER signal to the 10GEPON OLT optical module, TxBEN1 signal to the EPON optical module emitting 1310 wavelength, and TxBEN2 signal to the 10GEPON ONU optical module emitting 1270 wavelength.
- 6. The method of claim 6, wherein the conditional expansion comprises: in calibrating or testing the 1310 wavelength RSSI of the 10GEPON OLT optical module, the TRIGGER of the 10GEPON OLT optical module and the TxBEN1 of the EPON optical module need to be linked, at this moment, the 10GEPON ONU optical module with the 1270 wavelength is prohibited from emitting light, but only the EPON ONU optical module with the 1310 wavelength is enabled to emit light in a burst mode, the BEN2_ LEVEL _ reg is required to be configured as "1", for making the 1270 wavelength 10GEPON ONU optical module emit no light in the level mode, TRGBEN _ mode _ reg is configured to be "01", configured to link TRIGGER and TxBEN, RSSIcon _ reg (7..6) '01', for allowing the TRIGGER to be linked only with TxBEN1 and not with TxBEN2, and finally configuring RSSI _ start _ reg to be 1 to make a linkage timing of TRIGGER and TxBEN1, namely, the CPLD outputs a TRIGGER pulse to the 10GEPON OLT optical module to make it enter the RSSI sampling mode, simultaneously, a TxBEN1 pulse is output to an ONU1 slot to enable an EPON ONU optical module to emit light in a burst mode, meanwhile, the output TxBEN2 is constantly 1 to the ONU2 slot, so that the 10GEPON ONU optical module does not emit light.
- 7. The method of claim 6, wherein the conditional expansion comprises: in calibrating or testing the 1270 wavelength RSSI of the 10GEPON OLT optical module, the TRIGGER of the 10GEPON OLT optical module and the TxBEN2 of the 10GEPON ONU are required to be linked, at the moment, the EPON ONU optical module with the 1310 wavelength is forbidden to emit light, only the 10GEPON ONU optical module with the 1270 wavelength is enabled to emit light in a burst mode, BEN1_ LEVEL _ reg is configured to be 1', for making the 1310 wavelength EPON ONU optical module emit no light in the level mode, TRGBEN _ mode _ reg is configured to be "01", for linking TRIGGER and TxBEN, RSSIcon _ reg (7..6) '10', for allowing the TRIGGER to be linked only with TxBEN2 and not with TxBEN1, and finally configuring RSSI _ start _ reg to be 1 to make a linkage timing of TRIGGER and TxBEN2, namely, the CPLD outputs a TRIGGER pulse to the 10GEPON OLT optical module to make it enter the RSSI sampling mode, simultaneously, a TxBEN2 pulse is output to an ONU2 slot to enable the 10GEPON ONU optical module to emit light in a burst mode, and meanwhile, the output TxBEN1 is constantly 1 to an ONU1 slot, so that the EPON ONU optical module does not emit light.
- 8. The method of claim 1, it is characterized in that for the XGSON Combo OLT optical module with two optical wavelength receivers, since the XGS-PON Combo OLT optical module is two independent APD optical receivers that can simultaneously receive ONU light of two wavelengths of 1310 wavelength and 1270 wavelength, two ONU optical modules are required as burst-mode light sources, including one GPON ONU optical module emitting 1310 wavelengths and one xgspoon ONU optical module emitting 1270 wavelengths, the GPON ONU optical module is inserted into an ONU1 slot, the XGSON ONU optical module is inserted into an ONU2 slot, the CPLD generates a TRIGGER signal for supplying to the XGSON OLT optical module, generates a TxBEN1 signal for supplying to the GPON ONU optical module emitting 1310 wavelength and generates a TxBEN2 signal for supplying to the XGSON ONU optical module emitting 1270 wavelength.
- 9. The method of claim 8, wherein the conditional expansion comprises: when the RSSI of 1310 and 1270 wavelengths of the XGSPON OLT optical module is calibrated or tested, the TRIGGER of the XGSPON OLT optical module and the TxBEN1 of the GPON ONU optical module are required to be simultaneously linked with the TxBEN2 of the XGSPON ONU optical module, rsscon _ reg (7..6) × 11 "is required to be configured for enabling the TRIGGER to be simultaneously linked with the TxBEN1 and the TxBEN2, and finally RSSI _ start _ reg ═ 1" is configured to set a linkage timing of the TRIGGER and the TxBEN1, namely, the CPLD outputs a TRIGGER pulse to the XGSPON OLT optical module to enable the XGSPON OLT optical module to enter an RSSI sampling mode, and outputs a TxBEN1 pulse to the ONU1 slot to enable the GPON ONU optical module to emit light in a burst mode, and outputs a TxBEN2 pulse to the ONU2 to enable the XGSPON ONU optical module to emit light in a burst mode.
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