CN115426052A - Overload protection device and method for optical module receiving end - Google Patents
Overload protection device and method for optical module receiving end Download PDFInfo
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- 238000012545 processing Methods 0.000 claims description 4
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- 229910021542 Vanadium(IV) oxide Inorganic materials 0.000 description 1
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- XJUNRGGMKUAPAP-UHFFFAOYSA-N dioxido(dioxo)molybdenum;lead(2+) Chemical compound [Pb+2].[O-][Mo]([O-])(=O)=O XJUNRGGMKUAPAP-UHFFFAOYSA-N 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
- H04B10/672—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal
- H04B10/674—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal using a variable optical attenuator
Abstract
The invention discloses an overload protection device and method for an optical module receiving end, wherein an adjustable attenuator made of electro-optic and acousto-optic materials is added in front of a photoelectric detector; the microcontroller sets a non-light input threshold A, a medium-intensity light input threshold B, an optimal light input threshold C and a receiver damage light input threshold D; in the power-on process of the optical module, the microcontroller and the adjustable attenuator are powered on in sequence, the attenuation value is set to be maximum, and the detector is powered on subsequently; if the received light power is greater than D, the overload risk is considered to exist, the power supply of the detector is closed, and the attenuation value is kept to be maximum; if the optical power is greater than C and less than or equal to D, reporting an alarm, and keeping the attenuation value to be maximum; if the optical power is greater than B and less than or equal to C, controlling the attenuation value to enable the optical power to be equal to C; if the optical power is greater than A and less than or equal to B, the attenuation value is kept minimum; if the optical power is less than or equal to A, no optical input is considered, and the attenuation value is kept to be maximum; the invention can effectively prevent the detector from overloading under various use conditions.
Description
Technical Field
The invention relates to the technical field of optical modules, in particular to an overload protection device and method for an optical module receiving end.
Background
With the explosive growth of data flow of the internet driven by applications such as 5G, cloud computing, big data, AI, AR/VR, internet of things and the like, the rapid development of optical communication is promoted, large data centers are continuously built, optical modules serve as key materials for interconnection of equipment, expensive long-distance optical modules are required to be used for interconnection of metropolitan area networks and backbone networks, avalanche photodiodes are used as photoelectric detectors of receiving ends, and in practical application, the input optical power of the optical modules exceeds the damage threshold of the detectors of the receiving ends due to misoperation and the like, so that the detectors are overloaded and damaged, and the customer experience is influenced.
In the existing overload protection method, an overload risk mark is attached to the appearance of an optical module to remind an operator, and the scheme has high requirements on personnel quality, subjectivity and the like; in addition, a mechanical optical switch is added in the optical module, the reliability of the mechanical structure is low, and the attenuation value is not continuously adjustable.
The invention adds the adjustable optical attenuator based on electro-optic or acousto-optic materials between the receiving optical port and the receiving part, sets the control flow, and the microcontroller adjusts the attenuation value by judging the magnitude relation between the receiving optical power and the set threshold value, the adjustment is rapid, the reliability is high, and the overload risk of the optical module under the condition of inputting various overload light intensity optical signals can be avoided.
Disclosure of Invention
The invention aims to quickly and reliably avoid the overload risk of an optical module under the condition of inputting various overload light intensity optical signals, and provides a design and a method for overload protection of an optical module receiving end.
The purpose of the invention is realized by the following technical scheme: an adjustable optical attenuator is added between a receiving optical port and a receiving part, and a corresponding control flow is provided, wherein the control flow comprises the following steps:
step S1: adding a variable optical attenuator between a receiving optical port and a receiving part, adjusting the intensity of an optical signal through the variable optical attenuator, and measuring and calculating the current received optical power through the receiving part;
step S2: setting a received optical power threshold and storing the received optical power threshold in a microcontroller;
and step S3: the optical module is electrified and started and starts to work;
and step S4: the microcontroller judges the overload protection of the current received optical power on the basis of the set received optical power threshold;
step S5; the microcontroller judges the current received optical power;
step S6: and the microcontroller periodically adjusts the attenuation value of the variable optical attenuator, measures and calculates the current received optical power, and then judges according to the steps S4-S5.
Further, the receiving part comprises a photoelectric detector and a microcontroller, the intensity of a light signal received by the photoelectric detector is converted into photoelectric response current, the microcontroller adjusts the attenuation value of the variable optical attenuator by controlling the voltage of the variable optical attenuator, periodically reads the photoelectric response current, converts the current received light power according to the photoelectric response current value, and the variation range of the attenuation value of the variable optical attenuator is S-T; the corresponding attenuation values of the adjustable optical attenuator under different working voltage values are stored in the microcontroller.
Further, the step S1 of setting the corresponding attenuation values of the adjustable optical attenuator under different operating voltage values includes the following steps:
s1.1: after the optical module is assembled, a power-adjustable laser light source is used as an input optical signal, the output optical power value of the light source is adjusted to be equal to the maximum input optical power of a photoelectric detector, the attenuation value of the variable optical attenuator is adjusted through a microcontroller, the microcontroller converts the current receiving optical power through the photoelectric response current value of the photoelectric detector, the corresponding receiving optical power value under different working voltage values is recorded, the specific attenuation value of the variable optical attenuator under different working voltage values is obtained through data processing, the data is stored in a memory of the microcontroller as a lookup table, the minimum attenuation value is recorded as S, and the maximum attenuation value is recorded as T.
Further, the received light power threshold comprises a no light input threshold a, a medium intensity light input threshold B, an optimal light input threshold C, and a receiver damage light input threshold D; the specific setting steps are as follows:
s2.1: the method comprises the steps that an optical module is electrified to finish normal work, the attenuation value of a variable optical attenuator is kept to be a maximum value T, a power-adjustable laser light source is used as an input light signal, the output light power value of the light source is adjusted to be the minimum input light power of a photoelectric detector, and a microcontroller records the receiving light power value at the moment as a lightless input threshold value A;
s2.2: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power of the photoelectric detector, and recording the receiving light power value at the moment as an optimal light input threshold value C by the microcontroller;
s2.3: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power minus T plus S of the photoelectric detector, and recording the receiving light power value at the moment as a medium-intensity light input threshold value B by the microcontroller;
s2.4: the overload input optical power value of the photodetector minus T is calculated and recorded by the microcontroller as the receiver impairment optical input threshold D.
Further, the step S3 includes first completing initialization after power-on, normally operating the microcontroller, then powering on the variable optical attenuator, keeping the attenuation value at the maximum value T, and finally powering on the receiving part.
Further, the overload protection decision in step S4 includes:
the microcontroller judges the magnitude relation between the current receiving optical power and a receiver damage optical input threshold value D, if the magnitude relation is larger than the threshold value D, the power supply of a receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be a maximum value T, the module reports a receiving overload alarm, only the optical module is electrified again for initialization operation to electrify the receiving part again, and a user is prompted to use the abnormal optical power.
Further, the step S5 of comparing, by the microcontroller, the measured current received light power value with the set received light power threshold includes:
if the microcontroller judges that the receiving optical power is greater than the optimal optical input threshold C and less than or equal to the receiver damaged optical input threshold D, the microcontroller reports a receiving optical power warning and keeps the attenuation value of the variable optical attenuator to be a maximum value T;
if the microcontroller judges that the receiving light power is greater than the medium-intensity light input threshold value B and less than or equal to the optimal light input threshold value C, the microcontroller controls the variable optical attenuator to reduce the attenuation value so that the receiving light power value is equal to the optimal light input threshold value C;
if the microcontroller judges that the received light power is greater than the non-light input threshold A and less than or equal to the medium-intensity light input threshold B, the signal light is considered to be input, the light intensity is small, and the attenuation value of the attenuator is controlled to be the minimum value S;
if the microcontroller judges that the received light power is less than or equal to a lightless input threshold value A, the microcontroller determines that lightless input is available, reports a lightless light signal, and keeps the attenuation value of the variable optical attenuator to be a maximum value T;
if the microcontroller judges that the received light power changes from being larger than the lightless input threshold value A to being smaller than the threshold value A, the signal light input is considered to be lost, and the attenuation value of the variable optical attenuator is controlled to be the maximum value T;
if the microcontroller judges that the receiving light power does not meet the requirements of the steps, the microcontroller is considered to be abnormal, the power supply of the receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be the maximum value T, an abnormal alarm is reported, and a user is prompted to electrify and initialize the optical module again.
The invention also provides an overload protection device for the receiving end of the optical module, which comprises a microcontroller, a transmitting part and a receiving part, wherein the microcontroller is respectively connected with the transmitting part and the receiving part, the transmitting part is provided with a transmitting light port, the receiving part is provided with a receiving light port, and an adjustable optical attenuator is arranged between the receiving part and the receiving light port.
Furthermore, the adjustable optical attenuator is made of electro-optic materials or acousto-optic materials.
The invention has the beneficial effects that: the invention can quickly and reliably solve the overload problem of the optical module, especially the optical module using an avalanche photodiode as a photoelectric detector under various use conditions based on the electro-optic effect or acousto-optic effect principle by a series of means of adding the variable optical attenuator between the receiving part and the receiving port of the optical module, optimizing the power-on sequence of each part, reasonably setting the receiving optical power judgment threshold value, reasonably configuring different operations and periodically judging the receiving optical power by the microcontroller and carrying out corresponding processing.
Drawings
Fig. 1 is a schematic structural diagram of an overload protection device for an optical module receiving end according to the present invention;
fig. 2 is a flowchart of an overload protection method for an optical module receiving end according to 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 obtained by a person skilled in the art without any inventive step are within the scope of protection of the present invention.
As shown in fig. 1, the overload protection device for the receiving end of the optical module of the present invention includes a microcontroller, an emitting portion, and a receiving portion, wherein the microcontroller is respectively connected to the emitting portion and the receiving portion, the emitting portion is provided with an emitting light port, the receiving portion is provided with a receiving light port, a tunable optical attenuator is disposed between the receiving portion and the receiving light port, and the tunable optical attenuator is made of an electro-optic material or an acousto-optic material. The electro-optic material can be one of vanadium oxide, tungsten oxide and nickel oxide, and the acousto-optic material can be one of mercurous chloride, lead molybdate and tellurium oxide.
As shown in fig. 2, the control flow includes the following steps:
step S1: the variable optical attenuator is characterized in that an electro-optic or acousto-optic material variable optical attenuator is additionally arranged between a receiving optical port and a receiving part, wherein the receiving part comprises a photoelectric detector serving as a main component, the photoelectric detector converts the intensity of a received optical signal into photoelectric response current, the microcontroller periodically reads the photoelectric response current, converts the current received optical power according to the current value, judges the optical power value and a set threshold value, the variation range of the attenuation value of the variable optical attenuator is S-T (dB), and the corresponding attenuation values of the variable optical attenuator under different working voltage values are stored in the microcontroller;
step S2: the microcontroller converts the current received light power according to the photoelectric response current value, sets four received light power thresholds, namely a no light input threshold A, a medium-intensity light input threshold B, an optimal light input threshold C and a receiver damaged light input threshold D, and stores the four received light power thresholds in the microcontroller, wherein no light signal is input when the received light power thresholds are less than or equal to the threshold A, no light signal is input when the received light power thresholds are greater than the threshold A and less than or equal to the threshold B, light signal input is considered when the received light power thresholds are greater than the threshold A and less than or equal to the threshold B, the input signal intensity is small, the signal intensity is considered to be moderate when the received light power thresholds are greater than the threshold B and less than or equal to the threshold C, the optimal value can be optimized, the signal intensity is considered to be strong when the received light power thresholds are greater than the threshold C and less than or equal to the threshold D, the received light power supply needs to be immediately closed;
and step S3: the optical module is powered on and started, initialization is firstly completed after power on, namely the microcontroller works normally, then the variable optical attenuator works in a powered-on mode, the attenuation value is kept to be the maximum value T, finally the receiving part works in a powered-on mode, the microcontroller periodically judges the current receiving optical power value, and the detector overload risk in the power-on process of the optical module is solved through the power-on sequence;
step S4; the microcontroller judges the current received optical power on the basis of setting a threshold, firstly, if the microcontroller judges that the current received optical power is greater than a receiver damaged optical input threshold D, the light intensity is considered to possibly damage a receiving part, the power supply of the receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be a maximum value T, a module reports and receives an overload alarm, in order to avoid the continuous damage of a photoelectric detector and prompt a user to use abnormity, and only the optical module is electrified again for initialization operation, the receiving part can be electrified again and the alarm is cleared;
step S5: if the microcontroller judges that the current receiving optical power is greater than the optimal optical input threshold C and less than or equal to the receiver damage optical input threshold D, the attenuation value of the variable optical attenuator is kept to be the maximum value T, and the microcontroller reports a warning that the current receiving optical power is high, so that a user is prompted that the input optical power is strong, and the photoelectric detector has the risk of reducing the service life;
step S6: the microcontroller judges that the current receiving optical power is greater than the medium-intensity optical input threshold B and less than or equal to the optimal optical input threshold C, the microcontroller controls the variable optical attenuator to reduce the attenuation value, so that the current receiving optical power value is equal to the optimal optical input threshold C;
step S7: if the microcontroller judges that the current receiving optical power is greater than the non-light input threshold A and less than or equal to the medium-intensity light input threshold B, the signal light is considered to be input, and the light intensity is small, and the attenuation value of the attenuator is controlled to be the minimum value S;
step S8: if the microcontroller judges that the current receiving optical power is less than or equal to a lightless input threshold value A, the microcontroller determines that lightless input exists, reports a lightless optical signal, and keeps the attenuation value of the variable optical attenuator to be a maximum value T;
step S9: if the microcontroller judges that the current receiving optical power changes from being larger than the lightless input threshold value A to being smaller than the threshold value A, the signal light input is considered to be lost, the attenuation value of the variable optical attenuator is controlled to be the maximum value T, and the detector is prevented from being damaged due to overload caused by overload light intensity input in the follow-up process;
step S10: if the controller judges that the current receiving optical power does not meet the requirements of the steps, the microcontroller is considered to work abnormally, the power supply of the receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be the maximum value T, an abnormal alarm is reported, and a user is prompted to electrify and initialize the optical module again.
Step S11: and the microcontroller periodically repeats the steps from S4 to S10 to judge the current received light power value and operates according to the specific requirements of each step.
The microcontroller realizes the adjustment of the attenuation value of the variable optical attenuator by controlling the voltage of the variable optical attenuator, and the corresponding attenuation values of the variable optical attenuator under different working voltage values are stored in the microcontroller.
Wherein the step S1 includes:
s1.1: after the optical module is assembled, a power-adjustable laser light source is used as an input optical signal, the output optical power value of the light source is adjusted to be equal to the maximum input optical power of a photoelectric detector, the attenuation value of the variable optical attenuator is adjusted through a microcontroller, the microcontroller converts the current receiving optical power through the photoelectric response current value of the photoelectric detector, the corresponding receiving optical power value under different working voltage values is recorded, the specific attenuation value of the variable optical attenuator under different working voltage values is obtained through data processing, the data is stored in a memory of the microcontroller as a lookup table, the minimum attenuation value is recorded as S, and the maximum attenuation value is recorded as T.
The step S2 includes:
s2.1: the method comprises the steps that an optical module is electrified to finish normal work, the attenuation value of a variable optical attenuator is kept to be a maximum value T, a power-adjustable laser light source is used as an input light signal, the output light power value of the light source is adjusted to be the minimum input light power of a photoelectric detector, and a microcontroller records the receiving light power value at the moment as a lightless input threshold value A;
s2.2: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power of the photoelectric detector, and recording the receiving light power value at the moment as an optimal light input threshold value C by the microcontroller;
s2.3: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power minus T plus S of the photoelectric detector, and recording the receiving light power value at the moment as a medium-intensity light input threshold value B by the microcontroller;
s2.4: and calculating a numerical value obtained by subtracting T from the overload input light power value of the photoelectric detector, and recording the numerical value as a receiver damage light input threshold value D by the microcontroller.
Example 1
The following operations are performed according to the steps of fig. 2:
step S1: the working wavelength of the input optical signal is 1311nm; selecting an adjustable optical attenuator manufactured based on the electro-optic effect of the vanadium dioxide film, determining that the attenuation value of the adjustable optical attenuator is 1.8dB at the control voltage of 0V and is 8dBm at the maximum value at the control voltage of 5V through the step S1.1, and storing the corresponding attenuation values of the adjustable optical attenuator under different working voltage values in a microcontroller;
step S2: the photoelectric detector is an avalanche type photoelectric detector, the minimum input optical power is-21.3 dBm, the maximum input optical power is-4.5 dBm, and the overload input optical power is 3.5dBm; according to the setting process from the step S2.1 to the step S2.4, four receiving optical power thresholds, namely a no optical input threshold A, a medium-intensity optical input threshold B, an optimal optical input threshold C and a receiver damage optical input threshold D are respectively-29.3 dBm, -18.7dBm, -12.5dBm and-4.5 dBm;
and step S3: the module power-on starting sequence is set as follows, after power-on, initialization is firstly completed, namely the microcontroller works normally, then the variable optical attenuator works power-on, at the moment, the control voltage is kept at 5V, the attenuation value is kept at the maximum value of 8dBm, and finally, the receiving part works power-on;
step S4; the microcontroller judges the current received optical power, when judging that the current received optical power is larger than-4.5 dBm, the microcontroller closes the power supply of the receiving part, controls the attenuation value of the variable optical attenuator to be the maximum value of 8dBm, and the module reports a receiving overload alarm and prompts an abnormality;
step S5: if the microcontroller judges that the current receiving optical power is more than-12.5 dBm and less than or equal to-4.5 dBm, the microcontroller reports a receiving optical power warning and keeps the attenuation value of the variable optical attenuator to be a maximum value of 8dB;
step S6: if the microcontroller judges that the current received optical power is greater than-18.7 dBm and less than or equal to-12.5 dBm, the microcontroller reduces the attenuation value of the variable optical attenuator to enable the current received optical power to be equal to the optimal optical input threshold value of-12.5 dBm, for example, when the current received optical power is-15 dBm, the attenuation value is controlled to be reduced by 2.5dBm;
step S7: if the microcontroller judges that the current received optical power is greater than a lightless input threshold value of minus 29.3dBm and less than or equal to a medium-intensity optical input threshold value of minus 18.7dBm, the attenuation value of the attenuator is controlled to be the minimum value of 1.8dB, and the current received optical power is increased by 6.2dB;
step S8: if the microcontroller judges that the current receiving optical power is less than or equal to a lightless input threshold value of-29.3 dBm, the microcontroller determines that lightless input exists, reports a lightless optical signal, and keeps the attenuation value of the variable optical attenuator to be a maximum value of 8dB;
step S9: if the microcontroller judges that the current receiving optical power is changed from being larger than a lightless input threshold value of minus 29.3dBm to being smaller than the threshold value of minus 29.3dBm, the signal light input is considered to be lost, and the attenuation value of the variable optical attenuator is controlled to be the maximum value of 8dB;
step S10: if the microcontroller judges that the current received optical power does not meet the requirements of the steps, the microcontroller is considered to work abnormally, the power supply of the receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be a maximum value of 8dB, an abnormal alarm is reported, and a user is prompted to electrify the optical module again for initialization.
Step S11: and the microcontroller takes 4ms as a period, repeats the step sequence from S4 to S10 to judge the current received light power value, and operates according to the specific requirements of each step.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and although the invention has been described in detail with reference to the foregoing examples, it will be apparent to those skilled in the art that various changes in the form and details of the embodiments may be made and equivalents may be substituted for elements thereof. All modifications, equivalents and the like which come within the spirit and principle of the invention are intended to be included within the scope of the invention.
Claims (9)
1. An overload protection method for an optical module receiving end is characterized by comprising the following steps:
step S1: adding a variable optical attenuator between a receiving optical port and a receiving part, adjusting the intensity of an optical signal through the variable optical attenuator, and measuring and calculating the current received optical power through the receiving part;
step S2: setting a received optical power threshold and storing the received optical power threshold in a microcontroller;
and step S3: the optical module is electrified and started and starts to work;
and step S4: the microcontroller judges the overload protection of the current received optical power on the basis of the set received optical power threshold;
step 5; the microcontroller judges the current received optical power;
step S6: and the microcontroller periodically adjusts the attenuation value of the variable optical attenuator, measures and calculates the current received optical power, and then judges according to the steps S4-S5.
2. The overload protection method for the receiving end of the optical module according to claim 1, wherein: the receiving part comprises a photoelectric detector and a microcontroller, the photoelectric detector receives optical signal intensity and converts the optical signal intensity into photoelectric response current, the microcontroller adjusts the attenuation value of the variable optical attenuator by controlling the voltage of the variable optical attenuator, reads the photoelectric response current periodically, converts the current received optical power according to the photoelectric response current value, and the variation range of the attenuation value of the variable optical attenuator is S-T; the corresponding attenuation values of the adjustable optical attenuator under different working voltage values are stored in the microcontroller.
3. The overload protection method for the receiving end of the optical module according to claim 2, wherein: the step S1 of setting the corresponding attenuation values of the adjustable optical attenuator under different working voltage values comprises the following steps:
s1.1: after the optical module is assembled, a power-adjustable laser light source is used as an input optical signal, the output optical power value of the light source is adjusted to be equal to the maximum input optical power of a photoelectric detector, the attenuation value of the variable optical attenuator is adjusted through a microcontroller, the microcontroller converts the current received optical power through the photoelectric response current value of the photoelectric detector, corresponding received optical power values under different working voltage values are recorded, specific attenuation values of the variable optical attenuator under different working voltage values are obtained through data processing, the data are stored in a memory of the microcontroller as a lookup table, the minimum attenuation value is recorded as S, and the maximum attenuation value is recorded as T.
4. The overload protection method for the receiving end of the optical module according to claim 1, wherein: the receiving light power threshold comprises a non-light input threshold A, a medium-intensity light input threshold B, an optimal light input threshold C and a receiver damage light input threshold D; the specific setting steps are as follows:
s2.1: the optical module is electrified to finish normal work, the attenuation value of the variable optical attenuator is kept to be a maximum value T, the power-adjustable laser light source is used as an input light signal, the output light power value of the light source is adjusted to be the minimum input light power of the photoelectric detector, and the microcontroller records the receiving light power value at the moment as a non-light input threshold value A;
s2.2: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power of the photoelectric detector, and recording the receiving light power value at the moment as an optimal light input threshold value C by the microcontroller;
s2.3: keeping the attenuation value of the variable optical attenuator to be a maximum value T, adjusting the output light power value of the light source to be the maximum input light power minus T plus S of the photoelectric detector, and recording the receiving light power value at the moment as a medium-intensity light input threshold value B by the microcontroller;
s2.4: the overload input optical power value of the photodetector minus T is calculated and recorded by the microcontroller as the receiver impairment optical input threshold D.
5. The overload protection method for the receiving end of the optical module according to claim 1, wherein: and the step S3 comprises the steps of firstly finishing initialization after power-on, normally working the microcontroller, then powering on the variable optical attenuator to work, keeping the attenuation value to be the maximum value T, and finally powering on the receiving part.
6. The overload protection method for the receiving end of the optical module according to claim 1, wherein: the overload protection decision in step S4 includes:
the microcontroller judges the magnitude relation between the current receiving optical power and a receiver damage optical input threshold value D, if the magnitude relation is larger than the threshold value D, the power supply of a receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be a maximum value T, the module reports a receiving overload alarm, only the optical module is electrified again for initialization operation to electrify the receiving part again, and a user is prompted to use the abnormal optical power.
7. The overload protection method for the receiving end of the optical module according to claim 1, wherein: the step S5 of comparing the measured current received optical power value with the set received optical power threshold by the microcontroller includes:
if the microcontroller judges that the received light power is greater than the optimal light input threshold C and less than or equal to the receiver damage light input threshold D, the microcontroller reports a received light power warning and keeps the attenuation value of the variable optical attenuator to be a maximum value T;
if the microcontroller judges that the receiving light power is greater than the medium-intensity light input threshold value B and less than or equal to the optimal light input threshold value C, the microcontroller controls the variable optical attenuator to reduce the attenuation value so that the receiving light power value is equal to the optimal light input threshold value C;
if the microcontroller judges that the received light power is greater than the non-light input threshold A and less than or equal to the medium-intensity light input threshold B, the signal light is considered to be input, the light intensity is small, and the attenuation value of the attenuator is controlled to be the minimum value S;
if the microcontroller judges that the received light power is less than or equal to a lightless input threshold value A, the microcontroller determines that lightless input is available, reports a lightless light signal, and keeps the attenuation value of the variable optical attenuator to be a maximum value T;
if the microcontroller judges that the received light power changes from being larger than the lightless input threshold value A to being smaller than the threshold value A, the signal light input is considered to be lost, and the attenuation value of the variable optical attenuator is controlled to be the maximum value T;
if the microcontroller judges that the receiving light power does not meet the requirements of the steps, the microcontroller is considered to be abnormal, the power supply of the receiving part is closed, the attenuation value of the variable optical attenuator is controlled to be the maximum value T, an abnormal alarm is reported, and a user is prompted to electrify and initialize the optical module again.
8. An overload protection device for an optical module receiving end comprises a microcontroller, a transmitting part and a receiving part, and is characterized in that: the microcontroller is respectively connected with the transmitting part and the receiving part, the transmitting part is provided with a transmitting light port, the receiving part is provided with a receiving light port, and a variable optical attenuator is arranged between the receiving part and the receiving light port.
9. The overload protection device for the receiving end of the optical module as claimed in claim 8, wherein: the variable optical attenuator is made of electro-optic materials or acousto-optic materials.
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Application publication date: 20221202 |