Method for automatically adjusting power of optical transmission system

Abstract

The invention discloses a method for automatically adjusting the power of an optical transmission system, which comprises the following steps of: periodically interacting upstream and downstream equipment to send optical power on an optical amplifier between sites by using an optical monitoring channel OSC of the optical amplifier and using an LLDP message TLV field, and monitoring an optical power value received by home terminal equipment so as to monitor the cross-loss change between the sites, thereby realizing the automatic adjustment of the power of the optical transmission system. The data acquisition from the site-2OLALA2OUT to the site-1OA-1PA comprises the following steps: the OLAOSC1 sends an optical power value txpower to a downstream optical amplifier, namely the OA-1PA, through an OSC channel in an LLDP message mode periodically for 5 seconds. The structure of the invention uses a dynamic gain mode, monitors the OSC channel through in-band light, and exchanges amplifier states of adjacent sites by using the LLDP message. And on the basis of the set target gain, a single network element automatically fine-tunes the gain of the amplifier so as to adjust the output power.

Description

Technical Field

[0001] The present invention relates to the technical field of automatic power adjustment of optical transmission systems, and in particular to a method for automatic power adjustment of optical transmission systems. Background Art

[0002] With the rapid development of optical communication technology, the amount of data carried by optical networks is growing exponentially, and the requirements for transmission efficiency and stability are increasing. Generally, there are three modes of using optical amplifiers in transmission networks: fixed gain, fixed power, and dynamic gain mode.

[0003] During actual deployment and use of optical networks, external changes beyond network planning, such as changes in fiber loss due to damaged or aged optical cables or poor connector contact, can cause variations in span loss between sites. When EDFA amplifiers are configured in fixed-gain mode, they cannot dynamically compensate for these variations in span loss upstream and downstream of sites. This can cause actual output optical power to differ from the fixed gain settings initially planned and used during equipment commissioning.

[0004] To address this uncertainty, automatic adjustment technology for optical power and gain has become the core support for ensuring network stability and improving transmission efficiency. Traditional manual management models will gradually be replaced by automated and intelligent control technologies due to their slow response speed, high cost and proneness to errors. Summary of the Invention

[0005] The present invention provides a method for automatically adjusting power of an optical transmission system, which can effectively solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention provides the following technical solutions: a method for automatically adjusting the power of an optical transmission system, which uses the optical amplifier optical monitoring channel (OSC) and the LLDP message TLV field to periodically exchange the optical power transmitted by upstream and downstream devices on optical amplifiers between sites, monitor the optical power received by the local device, and thus monitor the change in span loss between sites;

[0007] Based on the set target gain, the gain of the preamplifier PA or line amplifier LA is dynamically adjusted to dynamically adjust the output power to compensate for the span loss variation between the two sites.

[0008] The steps include:

[0009] S1. After the initial deployment of the system or the equipment goes online, the site-side optical amplifier completes equipment debugging based on the pre-configured target gain;

[0010] S2: After the optical amplifier switches to dynamic gain mode, it periodically obtains and compares upstream and downstream power information through the OSC channel, calculates the current span loss value of the optical fiber link, and compares it with the initial or historical benchmark span loss value to determine whether there is an actual span loss change in the link;

[0011] S3. When the detected span loss variation exceeds a preset threshold, the gain value of the preamplifier or line amplifier is dynamically fine-tuned according to the span loss deviation. By adjusting the gain to compensate for the link span loss variation, the output power is dynamically adjusted.

[0012] S4. During the gain adjustment process, the system ensures that the actual gain value after adjustment is within the valid gain range supported by the amplifier. If it exceeds the range, an alarm is generated to prompt the user to intervene;

[0013] S5. When the user modifies the target gain or adjustable optical attenuation parameters through the northbound interface, the system resets the adjusted gain to the initial value and recalculates the span loss benchmark.

[0014] According to the above technical solution, the gain adjustment steps from site-2OLALA2OUT to site-1OA-1PAIN are as follows: the upstream OSC transmit optical power is periodically collected and transmitted to the downstream OA-1PA through LLDP packets. In dynamic gain mode, the OA-1PA adjusts the adjust-gain parameter based on the calculated span loss change to ensure that the sum of the target gain and the adjusted gain is within the amplifier gain support range.

[0015] According to the above technical solution, data collection from site-2 OLALA2OUT to site-1 OA-1PAIN includes: OLAOSC1 sends the optical power value txpower through the OSC channel and transmits it to the downstream optical amplifier, namely OA-1PA, in the form of LLDP messages periodically every 5 seconds.

[0016] According to the above technical solution, after the site equipment from site-2OLALA2OUT to site-1OA-1PAIN is installed, the OA-1PA preamplifier uses the COSTANT_GIAN mode, configures the target gain target-gain and target voa, and completes equipment debugging to meet network planning expectations.

[0017] According to the above technical solution, the PA amplifier mode is changed to DYNAMIC_GAIN in site-2OLALA2OUT to site-1OA-1PAIN, and the default adjust-gain is 0dB;

[0018] adjust_gain=0.

[0019] According to the above technical solution, the loss calculation from OLA LA2OUT at site-2 to OA-1 PAIN at site-1 includes the following: the difference between the OLA OASC1 txpower received by OA-1 and the OSC received optical power (rxpower) monitored by OA-1 can be regarded as the span loss of the OLA to OA-1 section of the SPAN-1 optical fiber. If the OA-1 OSC does not generate an alarm for the first time, the calculated span loss at this time will be used as the basis for the next decision.

[0020] spanloss_base=monitoring_osc_rx_pwr–upstream_osc_tx_pw r;

[0021] According to the above technical solution, the decision execution in site-2OLALA2OUT to site-1OA-1PAIN includes: calculating the span loss with a period of 5 seconds. When the difference with the benchmark is greater than the 0.5dB threshold, OA-1PAadjust-gain is updated accordingly, and the benchmark value is updated;

[0022] When adjusting-gain, ensure that the OA-1PAtarget-gain+adjust-gain value is within the valid range supported by the amplifier gain. If it exceeds the range, an alarm will be issued to the user.

[0023] spanloss_update=monitoring_osc_rx_pwr–upstream_osc_tx_pwr;

[0024] spanloss_diff=spanloss_update–spanloss_base;

[0025] spanloss_base=spanloss_update;

[0026] adjust_gain=adjust_gain+spanloss_diff;

[0027] Send the sum of the target-gain manually configured by the user on the OA-1PA and the calculated adjust-gain to the amplifier hardware;

[0028] applied_gain=target_gain+adjust_gain.

[0029] According to the above technical solution, when a user modifies the OA-1 PA target gain target-gain or the adjustable optical attenuation target-voa value on the OA board through the northbound interface from site-2OLALA2OUT to site-1OA-1PAIN, it is considered a manual configuration adjustment intervention. PAadjust-gain is reset to 0dB, and the span loss reference value is recalculated.

[0030] adjust_gain=0.

[0031] According to the above technical solution, the power information exchange and span loss calculation between sites depend on the OSC channel. When an OSC alarm occurs, no adjust-gain adjustment is performed.

[0032] Compared with the existing technology, the present invention has the following advantages: The method of dynamically adjusting amplifier gain achieves the purpose of dynamically adjusting the amplifier output power. As an enhancement to the fixed-gain mode of the amplifier, the amplifier uses the dynamic gain mode to exchange amplifier status between adjacent sites through the in-band OSC channel using LLDP messages, thereby monitoring changes in fiber span loss between sites. Based on the set target gain, the network element automatically fine-tunes the amplifier gain to achieve the purpose of adjusting the output power, eliminating the need for a centralized controller or network management to adjust the amplifier gain or output power of each site on the end-to-end service path.

[0033] Using dynamic gain mode, the OSC channel is monitored in-band optically, and LLDP messages are used to exchange amplifier status with neighboring sites. Based on the set target gain, individual network elements automatically fine-tune the amplifier gain, thereby adjusting the output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0035] In the attached figure:

[0036] Figure 1 It is a schematic diagram of the method steps of the present invention;

[0037] Figure 2 It is a schematic structural diagram of the steps of the site-2OLA LA2OUT to site-1OA-1PAIN method of the present invention. DETAILED DESCRIPTION

[0038] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0039] Example: Figure 1-2 As shown, the present invention provides a technical solution, a method for automatically adjusting the power of an optical transmission system, characterized by: using the LLDP message TLV field through the optical amplifier optical supervisory channel (OSC) to periodically exchange the optical power transmitted by upstream and downstream devices on the optical amplifiers between sites, and monitor the optical power received by the local device, thereby monitoring the change in span loss between sites;

[0040] Based on the set target gain, the gain of the preamplifier PA or line amplifier LA is dynamically adjusted to dynamically adjust the output power to compensate for the span loss variation between the two sites.

[0041] The steps include:

[0042] S1. After the initial deployment of the system or the equipment goes online, the site-side optical amplifier completes equipment debugging based on the pre-configured target gain;

[0043] S2: After the optical amplifier switches to dynamic gain mode, it periodically obtains and compares upstream and downstream power information through the OSC channel, calculates the current span loss value of the optical fiber link, and compares it with the initial or historical benchmark span loss value to determine whether there is an actual span loss change in the link;

[0044] S3. When the detected span loss variation exceeds a preset threshold, the gain value of the preamplifier or line amplifier is dynamically fine-tuned according to the span loss deviation. By adjusting the gain to compensate for the link span loss variation, the output power is dynamically adjusted.

[0045] S4. During the gain adjustment process, the system ensures that the actual gain value after adjustment is within the valid gain range supported by the amplifier. If it exceeds the range, an alarm is generated to prompt the user to intervene;

[0046] S5. When the user modifies the target gain or adjustable optical attenuation parameters through the northbound interface, the system resets the adjusted gain to the initial value and recalculates the span loss benchmark.

[0047] The automatic power adjustment achieved by this method is completed at a single site, without the need for a centralized controller or network management to adjust the amplifier gain or output power of each site on the end-to-end service path.

[0048] According to the above technical solution, the gain adjustment steps from site-2OLALA2OUT to site-1OA-1PAIN are as follows: the upstream OSC transmit optical power is periodically collected and transmitted to the downstream OA-1PA through LLDP packets. In dynamic gain mode, the OA-1PA adjusts the adjust-gain parameter based on the calculated span loss change to ensure that the sum of the target gain and the adjusted gain is within the amplifier gain support range.

[0049] According to the above technical solution, data collection from site-2 OLALA2OUT to site-1 OA-1PAIN includes: OLAOSC1 sends the optical power value (txpower) through the OSC channel and transmits it periodically (5 seconds) to the downstream optical amplifier, namely OA-1PA, in the form of LLDP messages.

[0050] According to the above technical solution, after the site equipment from site-2OLALA2OUT to site-1OA-1PAIN is installed, OA-1PA (preamplifier) uses the COSTANT_GIAN mode, configures the target gain target-gain and target voa, and completes equipment debugging to meet network planning expectations.

[0051] According to the above technical solution, the PA amplifier mode is changed to DYNAMIC_GAIN in site-2OLALA2OUT to site-1OA-1PAIN, and the default adjust-gain is 0dB;

[0052] adjust_gain=0.

[0053] According to the above technical solution, the loss calculation from OLALA2OUT at site-2 to PAIN at site-1 includes the following: the difference between the OLAOSC1txpower received by OA-1 and the OSC received optical power (rxpower) monitored by OA-1 can be regarded as the span loss of the OLA to OA-1 section of the SPAN-1 optical fiber. If the OA-1 OSC does not generate an alarm for the first time, the calculated span loss at this time will be used as the basis for the next decision.

[0054] spanloss_base=monitoring_osc_rx_pwr–upstream_osc_tx_pw r;

[0055] According to the above technical solution, the decision execution in site-2OLALA2OUT to site-1OA-1PAIN includes: calculating the span loss with a period of 5 seconds. When the difference with the benchmark is greater than the 0.5dB threshold, OA-1PAadjust-gain is updated accordingly, and the benchmark value is updated;

[0056] When adjusting-gain, ensure that the OA-1PAtarget-gain+adjust-gain value is within the valid range supported by the amplifier gain. If it exceeds the range, an alarm will be issued to the user.

[0057] spanloss_update=monitoring_osc_rx_pwr–upstream_osc_tx_pwr;

[0058] spanloss_diff=spanloss_update–spanloss_base;

[0059] spanloss_base=spanloss_update;

[0060] adjust_gain=adjust_gain+spanloss_diff;

[0061] Send the sum of the target-gain manually configured by the user on the OA-1PA and the calculated adjust-gain to the amplifier hardware;

[0062] applied_gain=target_gain+adjust_gain.

[0063] According to the above technical solution, when a user modifies the OA-1 PA target gain target-gain or the adjustable optical attenuation target-voa value on the OA board through the northbound interface from site-2OLALA2OUT to site-1OA-1PAIN, it is considered a manual configuration adjustment intervention. PAadjust-gain is reset to 0dB, and the span loss reference value is recalculated.

[0064] adjust_gain=0.

[0065] According to the above technical solution, the power information exchange and span loss calculation between sites depend on the OSC channel. When an OSC alarm occurs, no adjust-gain adjustment is performed.

[0066] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A method for automatically adjusting power of an optical transmission system, characterized by: Through the optical amplifier optical monitoring channel (OSC), using the TLV field in LLDP packets, the upstream and downstream devices periodically exchange the transmit optical power on the optical amplifiers between sites and monitor the receive optical power value of the local device, thereby monitoring the changes in span loss between sites. Based on the set target gain, the gain of the preamplifier PA or line amplifier LA is dynamically adjusted to dynamically adjust the output power to compensate for the span loss variation between the two sites. The steps include: S1. After the initial deployment of the system or the equipment goes online, the site-side optical amplifier completes equipment debugging based on the pre-configured target gain; S2: After the optical amplifier switches to dynamic gain mode, it periodically obtains and compares upstream and downstream power information through the OSC channel, calculates the current span loss value of the optical fiber link, and compares it with the initial or historical benchmark span loss value to determine whether there is an actual span loss change in the link; S3. When the detected span loss variation exceeds a preset threshold, the gain value of the preamplifier or line amplifier is dynamically fine-tuned according to the span loss deviation. By adjusting the gain to compensate for the link span loss variation, the output power is dynamically adjusted. S4. During the gain adjustment process, the system ensures that the actual gain value after adjustment is within the valid gain range supported by the amplifier. If it exceeds the range, an alarm is generated to prompt the user to intervene; S5. When the user modifies the target gain or adjustable optical attenuation parameters through the northbound interface, the system resets the adjusted gain to the initial value and recalculates the span loss benchmark.

2. The method for automatic power adjustment of an optical transmission system according to claim 1, characterized in that: The gain adjustment procedure for the OLALA2OUT at site-2 to the OA-1PAIN at site-1 is as follows: the upstream OSC transmit optical power is periodically collected and transmitted to the downstream OA-1PA through LLDP packets. In dynamic gain mode, the OA-1PA adjusts the adjust-gain parameter based on the calculated span loss change to ensure that the sum of the target gain and the adjusted gain is within the amplifier gain support range.

3. The method for automatic power adjustment of an optical transmission system according to claim 2, characterized in that: Data collected from site-2 OLALA2OUT to site-1 OA-1PAIN includes: OLAOSC1 sends the optical power value txpower through the OSC channel in the form of LLDP messages periodically every 5 seconds to the downstream optical amplifier, namely OA-1PA.

4. The method for automatic power adjustment of an optical transmission system according to claim 3, characterized in that: After the equipment is installed in the site from OLALA2OUT at site-2 to OA-1PAIN at site-1, use the COSTANT_GIAN mode for the OA-1PA preamplifier, configure the target gain and target voa, and complete equipment debugging to meet network planning expectations.

5. The method for automatic power adjustment of an optical transmission system according to claim 3, wherein: Change the PA amplifier mode to DYNAMIC_GAIN in site-2OLALA2OUT to site-1OA-1PAIN. The default adjust-gain is 0dB. adjust_gain=0.

6. The method for automatic power adjustment of an optical transmission system according to claim 2, characterized in that: The loss calculation from OLA2OUT at site-2 to OA-1PAIN at site-1 includes the following: The difference between the OLAOSC1txpower received by OA-1 and the OSC received optical power (rxpower) monitored by OA-1 can be regarded as the span loss of the OLA to OA-1 section of the SPAN-1 fiber. If the OA-1 OSC does not generate an alarm for the first time, the calculated span loss is used as the basis for the next decision. spanloss_base=monitoring_osc_rx_pwr–upstream_osc_tx_pw r.

7. The method for automatic power adjustment of an optical transmission system according to claim 2, characterized in that: The decision execution in site-2OLALA2OUT to site-1OA-1PAIN includes: calculating the span loss with a period of 5 seconds. When the difference from the benchmark is greater than the 0.5dB threshold, OA-1PAadjust-gain is updated accordingly, and the benchmark value is updated; When adjusting-gain, ensure that the OA-1PAtarget-gain+adjust-gain value is within the valid range supported by the amplifier gain. If it exceeds the range, an alarm will be issued to the user. spanloss_update=monitoring_osc_rx_pwr–upstream_osc_tx_pwr; spanloss_diff=spanloss_update–spanloss_base; spanloss_base=spanloss_update; adjust_gain=adjust_gain+spanloss_diff; Send the sum of the target-gain manually configured by the user on the OA-1PA and the calculated adjust-gain to the amplifier hardware; applied_gain=target_gain+adjust_gain.

8. The method for automatic power adjustment of an optical transmission system according to claim 2, wherein: When a user modifies the OA-1 PA target gain (target-gain) or the adjustable optical attenuation (target-voa) value on the OA board through the northbound interface from site-2OLALA2OUT to site-1OA-1PAIN, it is considered a manual configuration adjustment. PAadjust-gain is reset to 0dB, triggering recalculation of the span loss reference value. adjust_gain=0.

9. The method for automatic power adjustment of an optical transmission system according to claim 2, characterized in that: Inter-site power information exchange and span loss calculation depend on the OSC channel. When an OSC alarm occurs, no adjust-gain adjustment is performed.

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