Self-adaptive burst optical power measurement module

Abstract

The utility model provides a self-adaptive burst optical power measurement module, which is characterized in that a photodiode driving module in the module provides voltage VAPD for an OLT (Optical Line Terminal) optical receiving assembly and outputs light current IOpSig detected by the OLT optical receiving assembly to an MCU (Microprogrammed Control Unit). The OLT burst mode receiving unit analyzes and judges the differential electric signal DO + / DO-to output RxSD; after the frequency divider reduces the frequency of the RxSD, a trigger signal RSSI Trigger is output to the MCU, and when the MCU detects an effective signal of the RSSI Trigger, the trigger is interrupted, and the light current IOpSig is sampled. The burst light power measuring module supports burst light power testing, only burst light to be measured needs to be input, clock signals corresponding to the burst light to be measured do not need to be additionally provided, a laser of burst light equipment to be measured does not need to be driven, compatibility is high, and burst light intensity changes can be dynamically reflected.

Description

Technical Field

[0001] This utility model belongs to the field of communication equipment technology, and specifically relates to an adaptive burst optical power measurement module. Background Technology

[0002] Currently, devices with burst light are widely used in fields such as communications, medical care, and scientific research. How to quantify the peak power of burst light at the user end has become an important issue, because only by knowing the magnitude of the burst light peak power can it be used correctly to avoid damaging the docking equipment.

[0003] However, most optical power meters currently on the market are designed to test the average optical power of continuous light and do not support burst light testing. While some devices support burst light testing, they require the device under test (DUT) to provide an interface to drive the laser or to output a synchronization clock. This is clearly unsuitable for burst light devices, as they are not designed to test peak power, and lasers are delicate components, posing application risks by providing external drivers. Some devices employ a peak hold mechanism, which can measure the peak value of the burst light, but only holds the maximum value, failing to update the measurement for power below the peak and thus not providing real-time feedback on the burst light power.

[0004] Typically, an OLT (Optical Line Terminal) optical module receives burst optical signals. The system containing the OLT knows when the burst optical signal is received, so the system provides a trigger signal to the OLT optical module. When the OLT optical module receives a valid trigger signal, it samples the received burst optical signal and calculates the peak power. A trigger signal input with known timing is an indispensable signal for the measurement of burst received optical power by the OLT optical module; it cannot adaptively trigger and sample the peak power of the burst optical signal.

[0005] Therefore, there is an urgent need for a burst optical power measurement module that can solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an adaptive burst power measurement module. This measurement module supports burst power testing, requiring only the burst light to be tested as input. It does not require an additional clock signal for the burst light to be tested, nor does it require driving the laser of the burst light device under test, thus exhibiting strong compatibility.

[0007] To achieve the above objectives, this utility model provides an adaptive burst optical power measurement module, which includes an OLT optical receiving component, a photodiode driving module, an OLT burst mode receiving unit, a frequency divider, and an MCU.

[0008] The OLT optical receiver component is used to receive the burst light under test and convert it into differential electrical signals DO+ / DO-. The output of the OLT optical receiver component is connected to the input of the OLT burst mode receiving unit, and the output of the OLT burst mode receiving unit is connected to a frequency divider; the output of the frequency divider is connected to an MCU.

[0009] The photodiode driver module provides the voltage VAPD to the OLT optical receiver component and outputs the photocurrent I_OpSig detected by the OLT optical receiver component to the MCU.

[0010] The OLT optical receiving component converts the received burst light under test into differential electrical signals DO+ / DO-. The OLT burst mode receiving unit analyzes and judges the received differential electrical signals DO+ / DO-. When the OLT burst mode receiving unit detects that the differential electrical signals DO+ / DO- are greater than the set threshold, the received signal indicator RxSD outputs a valid value. When the differential electrical signals DO+ / DO- are less than the set threshold, the received signal indicator RxSD outputs an invalid value. After the frequency divider reduces the frequency of the received signal indicator RxSD, it outputs a trigger signal RSSI Trigger to the MCU. When the MCU detects a valid RSSI Trigger signal, it triggers an interrupt and samples the photocurrent I_OpSig.

[0011] Preferably, the photocurrent I_OpSig is proportional to the intensity of the burst light to be measured.

[0012] Preferably, the MCU is connected to the computer via an I2C to USB connector. The MCU processes the sampling result of the photocurrent I_OpSig and converts it into an optical power value, which is then read by the computer.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The burst optical power measurement module disclosed in this utility model uses a general-purpose OLT optical receiving component and an OLT burst mode receiving unit. With the addition of a frequency divider for corresponding connection, burst optical power measurement can be realized. It is simple and easy to operate and has no strict timing requirements.

[0015] 2. The burst light power measurement module disclosed in this utility model can reflect the changes in burst light intensity in real time.

[0016] 3. The burst light power measurement module disclosed in this utility model supports burst light power testing. It only requires the burst light to be tested to be input. It does not require an additional clock signal for the burst light to be tested, nor does it require driving the laser of the burst light device to be tested. It has strong compatibility. Attached Figure Description

[0017] Figure 1 The schematic diagram of the adaptive burst optical power measurement module of this utility model is shown;

[0018] Figure 2 It shows Figure 1 The timing diagram of the corresponding node in the schematic diagram is shown;

[0019] Figure 3 A connection diagram of the burst optical power measurement module is shown. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings.

[0021] This invention provides an adaptive burst optical power measurement module, the schematic diagram of which is shown below. Figure 1 As shown, VCC and GND are the positive power supply interface and ground interface that provide the device with normal operation.

[0022] The measurement module includes an OLT optical receiver component, a photodiode driver module, an OLT burst mode receiver unit, a frequency divider, and an MCU. The output of the OLT optical receiver component is connected to the input of the OLT burst mode receiver unit, the output of the OLT burst mode receiver unit is connected to the frequency divider, and the output of the frequency divider is connected to the MCU.

[0023] The OLT optical receiver component is a common OLT receiver on the market, used to receive burst light under test and convert it into differential electrical signals DO+ / DO-.

[0024] The photodiode driver module provides voltage VAPD to the OLT optical receiver component and outputs the photocurrent I_OpSig detected by the OLT optical receiver component to the MCU. The photocurrent I_OpSig is proportional to the intensity of the burst light to be measured.

[0025] The OLT burst mode receiver unit is a general-purpose PON (Passive Optical Network) OLT chip, which is existing technology and will not be described in detail here.

[0026] The OLT optical receiver converts the received burst light under test into differential electrical signals DO+ / DO-. The OLT burst mode receiver analyzes the received differential electrical signals DO+ / DO-. When the differential electrical signals DO+ / DO- are greater than a set threshold, the Receive Signal Detector (RxSD) outputs a valid value, such as a high level; when the differential electrical signals DO+ / DO- are less than the set threshold, the Receive Signal Detector (RxSD) outputs an invalid value, such as a low level. The RxSD is input to a frequency divider, which reduces the frequency of the Receive Signal Detector (RxSD) before outputting a trigger signal RSSI Trigger to the MCU. When the MCU detects a valid RSSI Trigger signal, it triggers an interrupt and samples the photocurrent I_OpSig.

[0027] When a burst of light under test is input to the OLT optical receiver component, the RxSD output signal follows the burst light transition, forming a clock signal that is approximately synchronized with the injected burst light under test, i.e., an adaptive clock recovery mechanism. Since each burst light input generates a valid RxSD signal, frequent triggering of MCU interrupts can easily lead to MCU crashes. Therefore, in this solution, the RxSD signal is down-divided by a frequency divider before being output to the MCU.

[0028] Figure 2 for Figure 1 The timing diagram of the corresponding node in the block diagram is shown. "...n Pulses" indicates that there are n pulse optical signals in between. The photocurrent I_OpSig represents the detected burst light signal. Due to the circuit delay of the OLT optical receiving component and the OLT burst mode receiving unit, after the tPD delay, RxSD serves as the output of the received burst light signal indicator, following the changes in the injected burst light to form an approximately synchronous clock signal. After passing through the frequency divider, the RSSI Trigger frequency decreases relative to the RxSD signal. When the MCU detects the valid trigger signal of the RSSI Trigger, it samples the burst light signal I_OpSig. The burst light power measurement module disclosed in this utility model can reflect the changes in burst light intensity in real time.

[0029] Figure 3 This is a connection diagram for the burst optical power measurement module. The MCU connects to the computer via an I2C-to-USB connector, powers the burst optical power measurement device (e.g., 3.3V and GND are connected to the device's VCC and GND interfaces respectively), injects the burst optical signal under test into the measurement module, adapts to the burst optical signal, restores the signal clock, and divides the clock to trigger the MCU. Internally, the MCU samples the burst optical signal according to the set sampling mechanism, processes and calculates the burst optical power value. The user can read the optical power value in real time via computer. The MCU's sampling mechanism is existing technology and will not be described in detail here.

[0030] The burst light power measurement module disclosed in this utility model supports burst light power testing. It only requires the burst light to be tested as input, without the need to provide a corresponding clock signal for the burst light to be tested, nor is it necessary to drive the laser of the burst light device under test, thus having strong compatibility.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An adaptive burst optical power measurement module, characterized in that, The system includes an OLT optical receiver component, a photodiode driver module, an OLT burst mode receiver unit, a frequency divider, and an MCU. The OLT optical receiver component receives the burst light under test and converts it into differential electrical signals DO+ / DO-. The output of the OLT optical receiver component is connected to the input of the OLT burst mode receiver unit, and the output of the OLT burst mode receiver unit is connected to the frequency divider. The output of the frequency divider is connected to the MCU. The photodiode driver module provides a voltage VAPD to the OLT optical receiver component and converts the photocurrent I_OpSig detected by the OLT optical receiver component into a signal. The signal is output to the MCU. The OLT optical receiving component converts the received burst light under test into differential electrical signals DO+ / DO-. The OLT burst mode receiving unit analyzes and judges the received differential electrical signals DO+ / DO-. When the OLT burst mode receiving unit detects that the differential electrical signals DO+ / DO- are greater than the set threshold, the received signal indicator RxSD outputs a valid value. When the differential electrical signals DO+ / DO- are less than the set threshold, the received signal indicator RxSD outputs an invalid value. The frequency divider reduces the frequency of the received signal indicator RxSD and outputs a trigger signal RSSI Trigger to the MCU. When the MCU detects a valid RSSI Trigger signal, it triggers an interrupt and samples the photocurrent I_OpSig.

2. The adaptive burst optical power measurement module according to claim 1, characterized in that, The photocurrent I_OpSig is proportional to the intensity of the burst light to be measured.

3. The adaptive burst optical power measurement module according to claim 2, characterized in that, The MCU is connected to the computer via an I2C to USB connector. The MCU processes the sampling results of the photocurrent I_OpSig and converts them into optical power values, which are then read by the computer.

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