CN107547134B - Optical fiber transmission method and device - Google Patents
Optical fiber transmission method and device Download PDFInfo
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- CN107547134B CN107547134B CN201610505718.5A CN201610505718A CN107547134B CN 107547134 B CN107547134 B CN 107547134B CN 201610505718 A CN201610505718 A CN 201610505718A CN 107547134 B CN107547134 B CN 107547134B
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Abstract
The invention provides a method and a device for optical fiber transmission, which comprise the following steps: detecting current optical power corresponding to an initial optical signal after amplification, judging whether the current optical power meets a trigger condition, judging whether current gain corresponding to the current optical power is in an optimal gain range when the trigger condition is met, and outputting an optical signal corresponding to standard optical power after the current optical power is attenuated to the standard optical power if the current gain is in the optimal gain range, wherein the standard optical power is a standard value obtained after the initial power is amplified by the preset gain. Therefore, the optical power value and the gain of the optical signal in the optical fiber transmission can be controlled in real time so as to adjust the optimal optical power value and gain, the transmission is stable, the noise is low, finally, the amplified optical signal is attenuated, the requirement of a user on the optical signal gain value is met, and the output result is controllable.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for optical fiber transmission.
Background
As society has advanced and the use of fiber optic communication technology has increased rapidly, telephone companies have begun replacing older copper wire systems with fiber optic links since the first commercial installation of fiber optic systems in 1977. Optical fiber transmission, that is, data and signal transmission using optical fiber as a medium. The optical fiber can be used for transmitting analog signals and digital signals, and can meet the requirement of video transmission. Optical fiber is a very convenient tool for transmitting signals, and one thin optical core of a cable can replace more than thousands of physical communication lines, thereby completing large-scale and long-distance communication work.
Although optical fiber transmission has the advantages of large information capacity, high transmission speed and the like, the loss caused in the optical fiber transmission process also attracts more and more attention. The loss characteristics of optical fiber transmission are one of the most important factors determining the transmission distance, transmission stability and reliability of an optical network. The most common method for reducing the transmission loss of optical fiber at present is to use an optical fiber amplifier to amplify the optical power of the optical signal during the optical fiber transmission process. However, the conventional optical fiber amplifier and the optical fiber transmission method can only preset the gain for amplifying the optical power of the optical signal, which results in uncontrollable noise and unstable output during the optical signal transmission.
Disclosure of Invention
The embodiment of the invention aims to provide an optical fiber transmission method, which solves the problems that only gain for amplifying optical power of an optical signal can be preset in optical fiber transmission, and real-time adjustment cannot be carried out, so that noise cannot be controlled and output is unstable during optical signal transmission.
In order to achieve the above object, an embodiment of the present invention provides an optical fiber transmission method, including:
detecting current optical power corresponding to an amplified initial optical signal, and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power;
when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted;
and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain.
The embodiment of the present invention further provides an optical fiber transmission apparatus, including:
the detection module is used for detecting the current optical power corresponding to the amplified initial optical signal and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power;
a determining module, configured to determine whether a current gain corresponding to the current optical power is within an optimal gain range when the trigger condition is met, where the optimal gain is a gain value corresponding to the initial optical power when transmission noise is the minimum;
and the output module is used for outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power if the current gain is within the range of the optimal gain, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain.
Embodiments of the present invention also provide a computer storage medium having one or more programs stored therein that are executable by a computer, where the one or more programs, when executed by the computer, cause the computer to perform a method of optical fiber transmission as provided above.
One of the above technical solutions has the following advantages or beneficial effects:
in the embodiment of the invention, the current optical power corresponding to an amplified initial optical signal is detected, and whether the current optical power meets a trigger condition is judged, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power; when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted; and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain. Therefore, the optical power value and the gain of the optical signal in the optical fiber transmission can be controlled in real time so as to adjust the optimal optical power value and gain, the transmission is stable, the noise is low, finally, the amplified optical signal is attenuated, the requirement of a user on the optical signal gain value is met, and the output result is controllable.
Drawings
Fig. 1 is a flowchart of a method for optical fiber transmission according to an embodiment of the present invention;
FIG. 2 is a flow chart of another method for optical fiber transmission according to an embodiment of the present invention;
fig. 3 is a structural diagram of an optical fiber transmission apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, an embodiment of the present invention provides an optical fiber transmission method, including the following steps:
step S101, detecting a current optical power corresponding to an amplified initial optical signal, and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power.
In this step, the optical fiber transmission system is first started, initial parameters are set, the initial parameters may include an initial optical power, a preset gain, and an initial current value of an optical signal, where the optical signal is a signal that the optical fiber transmission system needs to transmit, the initial optical power is an initial intensity of an optical signal that a user needs to transmit, the preset gain and a multiple by which the optical signal that the user wants the optical signal to transmit through the optical fiber transmission system is amplified, that is, the multiple by which the initial optical power is amplified, the initial current value is an initial operating current of a laser in the optical fiber transmission system, and the initial current value is a current value corresponding to light output by the laser that needs to be coupled when the initial optical power is amplified by the preset gain theoretically.
After the optical fiber transmission system is operated, an initial optical signal is coupled with light emitted by a laser through a coupler after an interference signal is filtered by an isolator, the initial optical signal is amplified, the amplified initial optical signal is transmitted after being adjusted through the isolator and a filter, at the moment, the amplified initial optical signal passing through the isolator and the filter is detected and defined as current optical power, the current optical power is judged, and whether the current optical power meets a trigger condition is judged. The triggering condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power.
Step S102, when the trigger condition is satisfied, determining whether a current gain corresponding to the current optical power is within an optimal gain range, where the optimal gain is a gain value corresponding to the initial optical power when transmission noise is minimum.
In this step, when it is determined that the current optical power satisfies the trigger condition, that is, when the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and the preset gain of the initial optical power, further determination is performed to determine whether the current gain corresponding to the amplified current optical power, that is, the actual gain of the current optical power obtained by amplifying the initial optical power, is within the range of the optimal gain.
Since the light transmission system inevitably causes loss during transmission, if the initial optical power is amplified by the predetermined gain, the loss generally does not result in the optical power that should be theoretically amplified, and thus the actual gain is larger than the predetermined gain. In addition, when optical signals with different optical powers are transmitted, different transmission noises exist under different gains, and in order to reduce loss and obtain the best transmission effect, the optical signal is preferably transmitted by using a gain value corresponding to the minimum transmission noise, and the gain value corresponding to the minimum transmission noise is generally called as the optimal gain.
Therefore, in order to obtain the best transmission effect and deliver the transmission loss, it is necessary to determine whether the current gain corresponding to the current optical power is within the range of the optimal gain.
Step S103, if the current gain is within the optimal gain range, after attenuating the current optical power to a standard optical power, outputting an optical signal corresponding to the standard optical power, where the standard optical power is a standard value of the initial optical power amplified by the preset gain.
In this step, if the current gain is within the range of the optimal gain, that is, when the optical fiber transmission system is transmitting an optical signal, the transmission effect is optimal and the loss is the lowest. At this time, the current optical power is obtained by amplifying the initial optical power by the current gain, and the current gain is obtained by operating the system, and is generally greater than the preset gain, and meanwhile, the current optical power is also greater than or equal to the sum of the initial optical power of the optical signal and the preset gain of the initial optical power, so that the current optical power is greater than the optical power permitted by the user.
In order to enable a user to obtain an optical signal with a desired optical power, attenuation processing needs to be performed on the current optical power, where the optical signal with the current optical power is output after being attenuated to a standard optical power by an optical attenuator. The standard optical power is a theoretical standard value obtained by amplifying the initial power by the preset gain, that is, an optical power value of an optical signal desired by a user.
In this embodiment, a current optical power corresponding to an amplified initial optical signal is detected, and whether the current optical power meets a trigger condition is determined, where the trigger condition is that the current optical power is greater than or equal to a sum of an initial optical power of the optical signal and a preset gain of the initial optical power; when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted; and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain. Therefore, the optical power value and the gain of the optical signal in the optical fiber transmission can be controlled in real time so as to adjust the optimal optical power value and gain, the transmission is stable, the noise is low, finally, the amplified optical signal is attenuated, the requirement of a user on the optical signal gain value is met, and the output result is controllable.
As shown in fig. 2, another method for optical fiber transmission according to an embodiment of the present invention includes:
step S201, detecting a current optical power corresponding to an amplified initial optical signal, and determining whether the current optical power meets a trigger condition, where the trigger condition is that the current optical power is greater than or equal to a sum of the initial optical power of the optical signal and a preset gain of the initial optical power.
Step S202, when the trigger condition is met, calculating to obtain a current gain corresponding to the current optical power, wherein the current gain is a difference value between the amplified optical power and the initial optical power;
extracting the optimal gain by using a preset method;
and judging whether the absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain.
It should be noted that step S202 is replaceable, that is, step S202 may be understood as a limitation to step S102 in the embodiment shown in fig. 1, but in the embodiment of the present invention, step S102 is not limited to the implementation of step S202, for example, the implementation may also be implemented in an implementation that determines whether the current gain is within the range of the optimal gain by a ratio of the current gain to the optimal gain, that is, step S201 may be replaced by determining whether the current gain is within the range of the optimal gain or replacing the current gain with the feature in step S101 by a ratio of the current gain to the optimal gain.
In this step, when it is determined that the current optical power satisfies the trigger condition, that is, when the current optical power is greater than or equal to a sum of an initial optical power of the optical signal and a preset gain of the initial optical power, first, a calculation is performed through a preset algorithm to obtain a current gain corresponding to the current optical power. Wherein, the preset algorithm here is: the current gain is a difference between the amplified optical power and the initial optical power.
Then, the optimum gain is extracted using a preset method. In this embodiment, the optimum gain value corresponding to the initial optical power in the gain optical power noise table is searched for by looking up the gain optical power noise table. Since the specifications of the optical fiber amplifiers used in each optical fiber transmission system are different, the gain optical power noise tables are different for the optical fiber amplifiers of different specifications, and generally, each optical fiber amplifier has its own specific gain optical power noise table. However, the present invention is not limited to this, and the optimal gain may be obtained by corresponding calculation in other embodiments.
After finding the optimal gain, comparing the current gain with the optimal gain, and judging whether the current gain is in the direction of the optimal gain, wherein the judging method is to perform subtraction operation on the current gain and the optimal gain, judge whether the absolute value of the obtained difference is smaller than a preset threshold, and if the absolute value of the difference is smaller than the preset threshold, judge that the current gain is in the range of the optimal gain.
Preferably, in this embodiment, the predetermined threshold is 0.5. That is, if the absolute value of the difference between the current gain and the optimal gain is less than 0.5, it is determined that the current gain is within the range of the optimal gain.
Step S203, if the current gain is within the optimal gain range, after attenuating the current optical power to a standard optical power, outputting an optical signal corresponding to the standard optical power, where the standard optical power is a standard value of the initial optical power amplified by the preset gain.
Step S201 and step S203 are the same as step S101 and step S103 in the first embodiment of the present invention, and are not described herein again.
Optionally, the optical fiber transmission method further includes:
and if the current gain does not meet the trigger condition, compensating the initial output current of the laser to adjust the current optical power, and judging whether the adjusted current gain is in the range of the optimal gain or not after the adjusted current optical power meets the trigger condition.
In the present embodiment, this step is performed between step S201 and step S202.
In this step, when it is determined that the current optical power does not satisfy the trigger condition, that is, when the current optical power is smaller than the sum of the initial optical power of the optical signal and the preset gain of the initial optical power, in order to make the current power satisfy the trigger condition, a compensation method is used to compensate the initial output current of the laser, so that the optical power obtained by coupling the initial optical power and the compensated current, that is, the current optical power obtained after adjustment satisfies the trigger condition, and then it is determined whether the adjusted current gain is within the range of the optimal gain.
And if the current optical power obtained after the initial current is compensated does not meet the trigger condition, compensating again until the current optical power meets the trigger condition.
In the present embodiment, when compensating the current value of the laser, the constant compensation is adopted, that is, a constant current value is constantly compensated. Since different lasers have different operating currents, the fixed compensation value can be used to perform specific compensation values according to different characteristics of the lasers. In other embodiments, other compensation manners may also be adopted, such as gradually implementing the current compensation by using a larger compensation value and then gradually reducing the compensation value until the current optical power satisfies the trigger condition.
Optionally, the optical fiber transmission method further includes:
when the current gain is within the range of the optimal gain, monitoring the current output current of the laser in real time, wherein the current output current is the working current of the laser detected in real time;
judging whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold, wherein the first threshold current is the current of the laser working correspondingly when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain;
if the difference value between the current output current and the first threshold current of the laser is larger than the preset threshold, compensating the current output current by using a preset algorithm so as to ensure that the adjusted current gain is within the range of the optimal gain;
and if the difference value between the current output current and the first threshold current of the laser is smaller than or equal to the preset threshold, or the difference value between the current output current compensated by using a preset algorithm and the first threshold current of the laser is smaller than or equal to the preset threshold, performing attenuation processing on the current optical power.
In the present embodiment, this step is performed between step S202 and step S203.
In this step, if the current gain is within the range of the optimal gain, that is, when the optical fiber transmission system is transmitting an optical signal, the transmission effect is optimal and the loss is the lowest. And at the moment, monitoring the current output current of the laser in real time, wherein the current output current is the working current of the laser detected in real time.
The real-time monitoring refers to periodically monitoring and detecting the current output current, and in this embodiment, the period of the real-time monitoring may be 1 time per second, but is not limited thereto, and the period of the real-time monitoring may be set as needed.
After the current output current is detected, in order to prove that the laser operates stably and the output current is stable, the current output current of the laser is compared with the first threshold current of the laser, and whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold or not is judged. And the first threshold current is the current at which the laser correspondingly works when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain.
If the difference between the current output current and the first threshold current of the laser is greater than the preset threshold, that is, the working current of the laser changes, the optical fiber transmission system is unstable, and the optical power of the output optical signal cannot be stably guaranteed, so that the working current of the laser needs to be compensated by a preset algorithm, so that the difference between the current output current and the first threshold current of the laser is less than or equal to the preset threshold, and the adjusted current gain is within the range of the optimal gain.
The preset algorithm can be various, as long as the compensated working current of the laser can meet the requirement. For example, the preset algorithm may be: i = Id + (-K1 | (Ipd (n) -Ipd (0))), where I is the compensated laser driving current value, Id (n) is the detected laser driving current value, Ipd (n) is the detected optical power corresponding current value, Ipd (0) is the first threshold current, and K1 is the integral coefficient, where K1 is 2 in this embodiment.
And if the difference value between the current output current and the first threshold current of the laser is less than or equal to the preset threshold, continuing to execute the next step to attenuate the current optical power. In this embodiment, the preset threshold is 0.005 ma, but is not limited thereto, and the preset threshold may be set as needed.
Optionally, step S203 includes:
when the current gain is within the range of the optimal gain, monitoring the current optical power after attenuation in real time;
judging whether the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value or not;
if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is greater than the preset threshold value, compensating the working current of the attenuator by using a preset algorithm so as to ensure that the current optical power is attenuated to the standard optical power;
and if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to the preset threshold, considering the attenuated current optical power as the standard optical power, and outputting the optical signal corresponding to the standard optical power.
In this step, since the last output optical power needs to be controlled to meet the user's demand, the output optical power needs to be detected and adjusted, and thus when the current gain is within the range of the optimal gain, the attenuated current optical power is monitored in real time.
Judging whether the absolute value of the difference between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is smaller than or equal to a preset threshold, if the absolute value of the difference between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is larger than the preset threshold, adjusting an attenuator in an optical fiber transmission system by using a preset algorithm, particularly compensating the working current of the attenuator to perform attenuation adjustment on the current optical power, so that the adjusted current optical power meets the condition that the absolute value of the difference between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is smaller than or equal to the preset threshold, and the current optical power is guaranteed to be attenuated to the standard optical power.
The preset algorithm may be various, as long as the compensated attenuator can attenuate the current optical power to the standard optical power. For example, the predetermined algorithm may be: vset = V + (-K2 ^ C- (a + Pin))), where Vset is the driving voltage of the compensated attenuator, V is the detected driving voltage of the attenuator, C is the detected current optical power, Pin is the initial optical power of the optical signal, a is the preset gain of the initial optical power, and K2 is an integral coefficient, where K2 is 0.1 in the present embodiment.
And if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value, considering the current optical power as the standard optical power, and directly outputting the optical signal corresponding to the standard optical power without adjustment.
In the present embodiment, the preset threshold is 0.2dBm, but the present invention is not limited thereto, and in other embodiments, the preset threshold may be set as needed.
In this embodiment, a current optical power corresponding to an amplified initial optical signal is detected, and whether the current optical power meets a trigger condition is determined, where the trigger condition is that the current optical power is greater than or equal to a sum of an initial optical power of the optical signal and a preset gain of the initial optical power; calculating to obtain a current gain corresponding to the current optical power, wherein the current gain is a difference value between the amplified optical power and the initial optical power, extracting the optimal gain by using a preset method, judging whether an absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain; and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain. Therefore, the optical power value and the gain of the optical signal in the optical fiber transmission can be controlled in real time so as to adjust the optimal optical power value and gain, the transmission is stable, the noise is low, finally, the amplified optical signal is attenuated, the requirement of a user on the optical signal gain value is met, and the output result is controllable.
As shown in fig. 3, an embodiment of the present invention provides an optical fiber transmission apparatus 300, including:
a detection module 301, configured to detect a current optical power corresponding to an amplified initial optical signal, and determine whether the current optical power meets a trigger condition, where the trigger condition is that the current optical power is greater than or equal to a sum of an initial optical power of the optical signal and a preset gain of the initial optical power;
a determining module 302, configured to determine whether a current gain corresponding to the current optical power is within an optimal gain range when the trigger condition is met, where the optimal gain is a gain value corresponding to the initial optical power when transmission noise is the minimum;
if the current gain is within the range of the optimal gain, the output module 303 attenuates the current optical power to a standard optical power, and then outputs an optical signal corresponding to the standard optical power, where the standard optical power is a standard value of the initial optical power amplified by the preset gain.
Optionally, the apparatus 300 further includes:
and the compensation module 304 is configured to compensate the output current of the laser to adjust the current optical power if the trigger condition is not met, and then determine whether the adjusted current gain is within an optimal gain range after the adjusted current optical power meets the trigger condition.
Optionally, the determining module 302 may be configured to calculate and adjust the current gain when the trigger condition is met, where the current gain is a difference between the amplified optical power and the initial optical power;
extracting the optimal gain by using a preset method;
and judging whether the absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain.
Optionally, the apparatus 300 further includes:
a first monitoring module 305, configured to monitor a current output current of the laser in real time when the current gain is within the range of the optimal gain, where the current output current is an operating current of the laser detected in real time;
judging whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold, wherein the first threshold current is the current of the laser working correspondingly when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain;
if the difference value between the current output current and the first threshold current of the laser is larger than the preset threshold, compensating the current output current by using a preset algorithm so as to ensure that the adjusted current gain is within the range of the optimal gain;
and if the difference value between the current output current and the first threshold current of the laser is smaller than or equal to the preset threshold, or the difference value between the current output current compensated by using a preset algorithm and the first threshold current of the laser is smaller than or equal to the preset threshold, performing attenuation processing on the current optical power.
Optionally, the apparatus 300 further includes:
a second monitoring module 306, configured to monitor the current optical power after attenuation in real time when the current gain is within the range of the optimal gain;
judging whether the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value or not;
if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is greater than the preset threshold value, compensating the working current of the attenuator by using a preset algorithm so as to ensure that the current optical power is attenuated to the standard optical power;
and if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to the preset threshold, considering the attenuated current optical power as the standard optical power, and outputting the optical signal corresponding to the standard optical power.
In this embodiment, a current optical power corresponding to an amplified initial optical signal is detected, and whether the current optical power meets a trigger condition is determined, where the trigger condition is that the current optical power is greater than or equal to a sum of an initial optical power of the optical signal and a preset gain of the initial optical power; when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted; and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain. Therefore, the optical power value and the gain of the optical signal in the optical fiber transmission can be controlled in real time so as to adjust the optimal optical power value and gain, the transmission is stable, the noise is low, finally, the amplified optical signal is attenuated, the requirement of a user on the optical signal gain value is met, and the output result is controllable.
It will be understood by those skilled in the art that all or part of the steps of the method for implementing the above embodiments may be implemented by hardware associated with program instructions, and the program may be stored in a computer readable medium, and when executed, the program includes the following steps:
detecting current optical power corresponding to an amplified initial optical signal, and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power;
when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted;
and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain.
Optionally, the method further includes:
and if the current gain does not meet the trigger condition, compensating the initial output current of the laser to adjust the current optical power, and judging whether the adjusted current gain is in the range of the optimal gain or not after the adjusted current optical power meets the trigger condition.
Optionally, the step of judging whether the current gain is within an optimal gain range when the trigger condition is satisfied includes:
when the trigger condition is met, calculating to obtain the current gain, wherein the current gain is the difference value between the amplified optical power and the initial optical power;
extracting the optimal gain by using a preset method;
and judging whether the absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain.
Optionally, the method may include:
when the current gain is within the range of the optimal gain, monitoring the current output current of the laser in real time, wherein the current output current is the working current of the laser detected in real time;
judging whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold, wherein the first threshold current is the current of the laser working correspondingly when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain;
if the difference value between the current output current and the first threshold current of the laser is larger than the preset threshold, compensating the current output current by using a preset algorithm so as to ensure that the adjusted current gain is within the range of the optimal gain;
and if the difference value between the current output current and the first threshold current of the laser is smaller than or equal to the preset threshold, or the difference value between the current output current compensated by using a preset algorithm and the first threshold current of the laser is smaller than or equal to the preset threshold, performing attenuation processing on the current optical power.
Optionally, if the current gain is within the range of the optimal gain, the step of outputting the optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power further includes:
when the current gain is within the range of the optimal gain, monitoring the current optical power after attenuation in real time;
judging whether the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value or not;
if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is greater than the preset threshold value, compensating the working current of the attenuator by using a preset algorithm so as to ensure that the current optical power is attenuated to the standard optical power;
and if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to the preset threshold, considering the attenuated current optical power as the standard optical power, and outputting the optical signal corresponding to the standard optical power.
The storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A method of optical fiber transmission, comprising:
detecting current optical power corresponding to an amplified initial optical signal, and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power;
when the trigger condition is met, judging whether the current gain corresponding to the current optical power is in an optimal gain range, wherein the optimal gain is a gain value corresponding to the minimum transmission noise when the initial optical power is transmitted;
and if the current gain is within the range of the optimal gain, outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain.
2. The method of claim 1, wherein the method further comprises:
and if the current gain does not meet the trigger condition, compensating the initial output current of the laser to adjust the current optical power, and judging whether the adjusted current gain is in the range of the optimal gain or not after the adjusted current optical power meets the trigger condition.
3. The method of claim 1, wherein the step of determining whether the current gain is within an optimal gain range when the trigger condition is satisfied comprises:
when the trigger condition is met, calculating to obtain the current gain, wherein the current gain is the difference value between the amplified optical power and the initial optical power;
extracting the optimal gain by using a preset method;
and judging whether the absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain.
4. The method of claim 2, wherein the method further comprises:
when the current gain is within the range of the optimal gain, monitoring the current output current of the laser in real time, wherein the current output current is the working current of the laser detected in real time;
judging whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold, wherein the first threshold current is the current of the laser working correspondingly when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain;
if the difference value between the current output current and the first threshold current of the laser is larger than the preset threshold, compensating the current output current by using a preset algorithm so as to ensure that the adjusted current gain is within the range of the optimal gain;
and if the difference value between the current output current and the first threshold current of the laser is smaller than or equal to the preset threshold, or the difference value between the current output current compensated by using a preset algorithm and the first threshold current of the laser is smaller than or equal to the preset threshold, performing attenuation processing on the current optical power.
5. The method of claim 1, wherein the step of outputting the optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power if the current gain is within the range of the optimal gain further comprises:
when the current gain is within the range of the optimal gain, monitoring the current optical power after attenuation in real time;
judging whether the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value or not;
if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is greater than the preset threshold value, compensating the working current of the attenuator by using a preset algorithm so as to ensure that the current optical power is attenuated to the standard optical power;
and if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to the preset threshold, considering the attenuated current optical power as the standard optical power, and outputting the optical signal corresponding to the standard optical power.
6. An optical fiber transmission apparatus, comprising:
the detection module is used for detecting the current optical power corresponding to the amplified initial optical signal and judging whether the current optical power meets a trigger condition, wherein the trigger condition is that the current optical power is greater than or equal to the sum of the initial optical power of the optical signal and a preset gain of the initial optical power;
a determining module, configured to determine whether a current gain corresponding to the current optical power is within an optimal gain range when the trigger condition is met, where the optimal gain is a gain value corresponding to the initial optical power when transmission noise is the minimum;
and the output module is used for outputting an optical signal corresponding to the standard optical power after attenuating the current optical power to the standard optical power if the current gain is within the range of the optimal gain, wherein the standard optical power is a standard value of the initial optical power amplified by the preset gain.
7. The apparatus of claim 6, further comprising a compensation module, configured to compensate an output current of the laser to adjust the current optical power if the trigger condition is not satisfied, and determine whether the adjusted current gain is within an optimal gain range after the adjusted current optical power satisfies the trigger condition.
8. The apparatus of claim 7, wherein the determining module is further configured to adjust the current gain by calculation when the trigger condition is satisfied, wherein the current gain is a difference between the amplified optical power and the initial optical power;
extracting the optimal gain by using a preset method;
and judging whether the absolute value of the difference value between the current gain and the optimal gain is smaller than a preset threshold, and if the absolute value of the difference value is smaller than the preset threshold, judging that the current gain is in the range of the optimal gain.
9. The apparatus of claim 7, further comprising a first monitoring module for monitoring a present output current of the laser in real time when the present gain is within the range of the optimal gain, wherein the present output current is an operating current of the laser detected in real time;
judging whether the absolute value of the difference value between the current output current of the laser and the first threshold current of the laser is smaller than a preset threshold, wherein the first threshold current is the current of the laser working correspondingly when the current optical power meets the trigger condition for the first time and the current gain is within the range of the optimal gain;
if the difference value between the current output current and the first threshold current of the laser is larger than the preset threshold, compensating the current output current by using a preset algorithm so as to ensure that the adjusted current gain is within the range of the optimal gain;
and if the difference value between the current output current and the first threshold current of the laser is smaller than or equal to the preset threshold, or the difference value between the current output current compensated by using a preset algorithm and the first threshold current of the laser is smaller than or equal to the preset threshold, performing attenuation processing on the current optical power.
10. The apparatus of claim 6, further comprising a second monitoring module for monitoring the attenuated current optical power in real time when the current gain is within the range of the optimal gain;
judging whether the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to a preset threshold value or not;
if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is greater than the preset threshold value, compensating the working current of the attenuator by using a preset algorithm so as to ensure that the current optical power is attenuated to the standard optical power;
and if the absolute value of the difference value between the sum of the initial optical power of the optical signal and the preset gain of the initial optical power and the current optical power is less than or equal to the preset threshold, considering the attenuated current optical power as the standard optical power, and outputting the optical signal corresponding to the standard optical power.
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| CN109325297B (en) * | 2018-09-27 | 2022-03-08 | 郑州云海信息技术有限公司 | Method for managing length of wire harness and server |
| CN112543063A (en) * | 2019-09-23 | 2021-03-23 | 中兴通讯股份有限公司 | Output power adjusting method and device and amplifier |
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| WO2007039765A1 (en) * | 2005-10-06 | 2007-04-12 | Bookham Technology Plc | Optical component for gain-flattening wdm signals comprising said component and optical amplifier |
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