CN-116242588-B - Sensitivity-adjustable optical fiber connector detection method and circuit

CN116242588BCN 116242588 BCN116242588 BCN 116242588BCN-116242588-B

Abstract

The method is characterized by comprising the following steps of 1, adopting an infrared receiving and transmitting module to emit infrared detection light and receive the infrared detection reflection light so as to detect the physical connection state of the optical fiber connector, 2, receiving the infrared detection reflection light through a delay comparison module and comparing a reflection signal generated by the infrared detection reflection light with a reference voltage so as to generate a comparison signal, wherein the delay comparison module realizes adjustment of the width of a delay window based on an adjustment resistor so as to adjust the sensitivity of the state detection method, and 3, activating a light emitting diode through the comparison signal and outputting a state detection signal through a filtering module. The invention overcomes the displacement error of the optical fiber connector by adjusting the reference voltage and the width of the delay window, ensures the accuracy of the detection result and expands the application range of the method.

Inventors

LI SHUANGLONG
MO JINGYANG
LI SHUANGCEN
JIA TING
ZHOU WEI
QIU QI
JI YUAN
XU XIAOWEI
YU FEIYING
QIANG MENGYE
JIA ZEFENG
WANG GANG
SI ZHONGMING
ZHOU QI

Assignees

国网江苏省电力有限公司无锡供电分公司

Dates

Publication Date: 20260512
Application Date: 20230113

Claims (7)

1. A method for detecting an optical fiber connector with adjustable sensitivity, the method comprising the steps of: Step 1, an infrared receiving and transmitting module is adopted to emit infrared detection light and receive the infrared detection reflected light so as to detect the physical connection state of the optical fiber connector; step 2, receiving the infrared detection reflected light through a delay comparison module, and comparing a reflected signal generated by the infrared detection reflected light with a reference voltage to generate a comparison signal; The delay comparison module is used for adjusting the width of a delay window based on an adjusting resistor, so that the sensitivity of the detection method is adjusted; step 3, activating the light emitting diode by using the comparison signal, and outputting a state detection signal through the filtering module; wherein the delay window width is determined based on the signal interference amplitude of the photodiode in the infrared transceiver module; calculating the optimal resistance value of the adjusting resistor based on the width of the delay window, and adjusting the current resistance value of the adjusting resistor in the delay comparison module based on the optimal resistance value; and the delay comparison module is realized by a hysteresis comparator, the distance between switching voltages of the hysteresis comparator in the process of rising and falling edges of signals is defined as a delay window width, and the delay window width is adjusted by adjusting the resistance value of the adjusting resistor so as to balance the detection sensitivity and the detection range.
2. The method for detecting an optical fiber connector with adjustable sensitivity according to claim 1, wherein: the method is realized by an optical fiber connector detection circuit with adjustable sensitivity, the circuit comprises an infrared receiving and transmitting module, an adjusting module, a delay comparing module, an indicating module and a filtering module, The infrared receiving and transmitting module is used for emitting infrared detection light and receiving infrared detection reflected light based on reflection of the optical fiber connector according to the infrared detection light; the adjusting module is used for realizing the generation of reference voltage based on self-voltage division adjustment; The delay comparison module is used for comparing the reflection signal generated by the infrared detection reflected light with the reference voltage and generating a comparison signal; The indication module is used for converting the comparison signal into an optical indication signal and outputting the optical indication signal; and the filtering module is used for filtering the comparison signal and outputting the filtered comparison signal to the MCU.
3. A method of detecting an adjustable sensitivity fiber optic connector according to claim 2, wherein: In the infrared receiving and transmitting module, the anode of a photodiode which emits infrared detection light is connected to a power supply voltage VCC through a first resistor R1, and the cathode is grounded; the collector electrode of the photodiode receiving the infrared detection reflected light is connected to a power supply voltage VCC through a second resistor R2 and is directly connected to the non-inverting input end of the delay comparison module; The emitter of the photodiode is grounded.
4. A method of detecting an adjustable sensitivity fiber optic connector according to claim 2, wherein: the regulating module comprises a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a first capacitor C1, wherein, The third resistor R3, the fourth resistor R4 and the fifth resistor R5 are connected end to end and connected between the power supply voltage VCC and the ground; The fourth resistor R4 is an adjustable resistor, the adjusting end of the adjustable resistor is connected with the upper polar plate of the first capacitor C1, and the lower polar plate of the first capacitor C1 is grounded; The adjusting end of the fourth resistor is also connected to the negative phase input end of the delay comparison module.
5. A method of detecting an adjustable sensitivity fiber optic connector according to claim 2, wherein: the delay comparison module comprises an operational amplifier and a regulating resistor, wherein, The operational amplifier is connected in a positive feedback mode, and the regulating resistor is positioned on a positive feedback branch of the operational amplifier; The positive phase input end of the operational amplifier is connected with the infrared receiving and transmitting module, the negative phase input end of the operational amplifier is connected with the adjusting module, and the output end of the operational amplifier is respectively connected with the indicating module and the filtering module; The adjusting end of the adjusting resistor is controlled by an external circuit to control the width of the delay window.
6. A method of detecting an adjustable sensitivity fiber optic connector according to claim 2, wherein: The indicating module comprises a seventh resistor R7, an eighth resistor R8 and a light emitting diode; wherein the seventh resistor R7 is connected between the power supply voltage VCC and the output end of the delay comparison module; one end of the eighth resistor R8 is connected with the power supply voltage, the other end of the eighth resistor R8 is connected with the positive electrode of the light emitting diode, and the negative electrode of the light emitting diode is connected with the output end of the delay comparison module.
7. A method of detecting an adjustable sensitivity fiber optic connector according to claim 2, wherein: the filtering module is an RC circuit.

Description

Sensitivity-adjustable optical fiber connector detection method and circuit Technical Field The invention relates to the technical field of electronics, in particular to a detection method and a circuit of an optical fiber connector with adjustable sensitivity. Background Currently, in the field of long-distance communication, optical signals are usually transmitted through a plurality of segments of optical fibers connected to each other. The single-mode optical fiber or the multimode optical fiber can be detachably connected end to end based on the optical fiber connector, and the two end faces of the optical fiber are precisely butted, so that the light energy output by the transmitting optical fiber can be coupled into the receiving optical fiber to the greatest extent, and the loss and the error of an intervening optical link in the optical fiber connection process are reduced. In practical applications, a fiber optic connection box is generally used to implement connection transmission of multiple single-mode or multimode fibers. A number of fiber optic connectors may typically be included in a single fiber optic connection box, each capable of end-to-end mating of two optical fibers. However, in a power system or other application scenario, multiple fiber optic connectors in a fiber optic connection box may not all be in a connected state. In addition, since the optical fiber connection box is generally applied to environments such as a cable tower and the like with severe environments or difficult to observe, maintenance personnel of the optical fiber communication system have difficulty in collecting, monitoring, and even maintaining and controlling the states of the respective optical fiber connectors in the optical fiber connection box for a plurality of times. Furthermore, because the optical fiber connectors in the optical fiber connection box can be actually operated on site by operation and maintenance personnel, the connection and disconnection of the optical fibers are realized, and the network architecture of the optical fiber communication system is adjusted, so that the plugging operation of the optical fiber connectors on the optical fiber connectors is difficult to avoid. When an operator operates the optical fiber connector, a slight displacement of the optical fiber connector may occur. When the optical fiber connectors are moved, how to accurately collect the connection state of each connector in the optical fiber connection box becomes a problem which is difficult to solve in the prior art. In view of the foregoing, there is a need for a method and circuit for detecting an optical fiber connector with adjustable sensitivity. Disclosure of Invention In order to solve the defects in the prior art, the invention provides the optical fiber connector detection method and the optical fiber connector detection circuit with adjustable sensitivity, which are used for detecting the optical fiber connector through the infrared receiving and transmitting module so as to receive, process and analyze infrared detection reflected light reflected by the optical fiber connector, thereby obtaining a state detection signal of the optical fiber connector. The invention adopts the following technical scheme. The invention relates to a detection method of an optical fiber connector with adjustable sensitivity, which comprises the following steps of 1, adopting an infrared receiving and transmitting module to emit infrared detection light and receive the infrared detection reflection light so as to detect the physical connection state of the optical fiber connector, 2, receiving the infrared detection reflection light through a delay comparison module and comparing a reflection signal generated by the infrared detection reflection light with a reference voltage so as to generate a comparison signal, wherein the delay comparison module realizes the adjustment of the width of a delay window based on an adjusting resistor so as to adjust the sensitivity of the state detection method, and 3, activating a light emitting diode by utilizing the comparison signal and outputting the state detection signal through a filtering module. Preferably, the width of the delay window is determined based on the signal interference amplitude of the photodiode in the infrared receiving and transmitting module, the optimal resistance value of the adjusting resistor is calculated based on the width of the delay window, and the current resistance value of the adjusting resistor in the delay comparison module is adjusted based on the optimal resistance value. The invention relates to a detection circuit of an optical fiber connector with adjustable sensitivity, which comprises an infrared receiving and transmitting module, an adjusting module, a delay comparing module, an indicating module and a filtering module, wherein the infrared receiving and transmitting module is used for emitting infrared detection light and receiving the