CN112986663A - 一种L-band光纤放大器中前馈泵浦失效的探测结构及方法 - Google Patents

一种L-band光纤放大器中前馈泵浦失效的探测结构及方法 Download PDF

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CN112986663A
CN112986663A CN201911283703.9A CN201911283703A CN112986663A CN 112986663 A CN112986663 A CN 112986663A CN 201911283703 A CN201911283703 A CN 201911283703A CN 112986663 A CN112986663 A CN 112986663A
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output
current value
pump
band
feed
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朱之乾
傅永军
顾永士
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Fuzhou Gaoyi Communication Co Ltd
Photop Technologies Inc
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Priority to CN201911283703.9A priority Critical patent/CN112986663A/zh
Priority to US16/903,246 priority patent/US11677209B2/en
Priority to DE102020133142.8A priority patent/DE102020133142A1/de
Priority to FR2013078A priority patent/FR3109247B1/fr
Priority to GBGB2214966.0A priority patent/GB202214966D0/en
Priority to GB2019572.3A priority patent/GB2592112B/en
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Priority to US18/311,379 priority patent/US20230361525A1/en
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Abstract

本发明公开一种L‑band光纤放大器中前馈泵浦失效的探测结构及方法，在普通的输出监控PD之前，增加一个C/L band的薄膜滤波器。当前馈泵浦失效后，前级铒纤反转率急剧降低，从而对信号光产生强烈的吸收。失去信号光的进入，后级铒纤，在反馈泵浦的激励下，只能产生C‑band 受激自发辐射，而不能产生有效的L‑band信号。通过在输出监控PD支路增加C/L band的滤波器，可以阻止C‑band 受激自发辐射进入PD。使输出监控PD因为缺乏L‑band信号功率而触发软件报错。本发明兼容现有的设计，极易推广。

Description

一种L-band光纤放大器中前馈泵浦失效的探测结构及方法
技术领域
本发明涉及光学领域，尤其涉及一种L-band光纤放大器中前馈泵浦失效的探测结构及方法。
背景技术
目前市面上现有的探测手段主要是在泵浦后面增加额外的PD，以实现监控。增加了额外的成本器件和电路成本。同时还增加了电路的复杂度。第二种手段是利用泵浦内部的背光检测光电二极管。但是该光电二极管精度差，随寿命变化大，还容易收到外界光纤状态的影响(接受光偏振态的改变)，非常容易产生误报，实际效果并不理想。同时对于新型双芯片泵浦，该手段更是失去功效。
为满足当前迅猛增长的光通讯网络的容量需求，信号扩容到L band波段，随之而来新型L band光纤放大器被大规模铺设使用。L-band光纤放大器设计结构复杂，功率消耗大，越来越多的前馈泵浦被引入到设计当中。前馈泵浦虽然结构简单，但是由于缺乏闭环监控，缺少有效的扑捉手段，一旦失效难以及时定位。带来现网失效，宕机等严重问题。
发明内容
本发明的目的在于提供一种低成本的，高准确性的L-band光纤放大器中前馈泵浦失效的探测结构及方法。
本发明采用的技术方案是：
一种L-band光纤放大器中前馈泵浦失效的探测结构，光纤放大器包括前馈控制器、PI控制器、输入PD和输出PD，光纤放大器的输入接入第一分光器的公共端，第一分光器的第一分光口连接第一合波器的一个输入端，第一分光器的第二分光口连接输入PD的输入端，输入 PD的电输出口连接前馈控制器的输入端，前馈控制器的输出端连接前馈泵浦，前馈泵浦的输出连接第一合波器的另一输入端，第一合波器的输出端连接前级铒纤，前级铒纤的输出端连接第二合波器的一个输入端；输入PD的电输出口同时连接PI控制器的输入端，PI控制器的反馈端连接输出PD的输出端，PI控制器的输出端连接反馈泵浦，反馈泵浦的输出端连接第二合波器的另一输入端，第二合波器的输出端连接后级铒纤，后级铒纤的输出端连接第二分光器的公共端，第二分光器的第一分光口连接光纤放大器的输出端，第二分光器的第二分光口通过一C/L薄膜滤波器连接输出PD，C/L薄膜滤波器用于阻止C-BAND受激自发辐射进入输出PD中，输出PD上配置有监控软件，监控软件在反馈泵浦的电流值大于最大电流值或大于 2倍的正常工作电流值时发出反馈泵浦失效告警。
进一步地，前级铒纤的输出端通过一增益平坦滤波器连接第二合波器的一个输入端。
进一步地，本发明还公开了一种L-band光纤放大器中前馈泵浦失效的探测方法，其包括以下步骤：
步骤1，在L-band光纤放大器的输出监控PD的输入前端增加C/L滤波器，
步骤2，获取反馈泵浦的电流值以及对应时刻的正常工作电流值，
步骤3，分别判断获取的反馈泵浦的电流值是否大于最大电流值，同时判断反馈泵浦的电流值是否大于2倍的正常工作电流值；
步骤4，当反馈泵浦的电流值大于最大电流值或者大于2倍的正常工作电流值时，触发反馈泵浦失效告警。
进一步地，步骤2中的正常工作电流值在生产测试所得并记录入模块内存以供判断。
进一步地，步骤3的最大电流值为1090mA。
进一步地，步骤4的失效告警由用于监控输出PD的软件进行弹窗告警。
本发明采用以上技术方案，在普通的输出监控PD之前，增加一个C/L band的薄膜滤波器。当前馈泵浦失效后，前级铒纤反转率急剧降低，从而对信号光产生强烈的吸收。失去信号光的进入，后级铒纤在反馈泵浦的激励下，只能产生C-band受激自发辐射，而不能产生有效的L-band信号。通过在输出监控PD支路增加C/L band的滤波器，可以阻止C-band受激自发辐射进入PD。使输出监控PD因为缺乏L-band信号功率而触发软件报错。
本发明仅仅是简单的增加一个C/L薄膜滤波器，就能在复杂L-band放大器中，使用现有的PD，实现前馈泵浦失效的捕捉。避免了额外成本的增加，避免电路上的复杂设计，兼容现有的设计，极易推广。
附图说明
以下结合附图和具体实施方式对本发明做进一步详细说明；
图1为本发明一种L-band光纤放大器中前馈泵浦失效的探测结构示意图；
图2为本发明一种L-band光纤放大器中前馈泵浦失效的探测方法的测试结果示意图；
图3为本发明一种L-band光纤放大器中前馈泵浦失效的探测方法的告警逻辑流程示意图。
具体实施方式
如图1至图3之一所示，本发明公开了一种L-band光纤放大器中前馈泵浦失效的探测结构，光纤放大器包括前馈控制器FF、PI控制器、输入PD和输出PD，光纤放大器的输入端IN 接入第一分光器A1的公共端，第一分光器A1的第一分光口连接第一合波器B1的一个输入端，第一分光器A1的第二分光口连接输入PD(Input PD)的输入端，输入PD(Input PD)的一个输出口连接前馈控制器FF的输入端，前馈控制器FF的输出端连接前馈泵浦Pump 1，前馈泵浦Pump 1的输出连接第一合波器B1的另一输入端，第一合波器B1的输出端连接前级铒纤 D1，前级铒纤D1的输出端连接第二合波器B2的一个输入端；输入PD(Input PD)的另一输出口连接PI控制器的输入端，PI控制器的反馈端连接输出PD的输出端，PI控制器的输出端连接反馈泵浦Pump 2，反馈泵浦Pump 2的输出端连接第二合波器B2的另一输入端，第二合波器B2的输出端连接后级铒纤D2，后级铒纤D2的输出端连接第二分光器的公共端，第二分光器的第一分光口连接光纤放大器的输出端OUT，第二分光器的第二分光口通过一C/L薄膜滤波器连接输出PD，C/L薄膜滤波器用于阻止C-BAND受激自发辐射进入输出PD中，输出PD上配置有监控软件，监控软件在反馈泵浦Pump 2的电流值大于最大电流值或大于2倍的正常工作电流值时发出反馈泵浦Pump 2失效告警。
进一步地，前级铒纤D1的输出端通过一增益平坦滤波器C连接第二合波器B2的一个输入端。
进一步地，本发明还公开了一种L-band光纤放大器中前馈泵浦Pump 1失效的探测方法，其包括以下步骤：
步骤1，在L-band光纤放大器的输出监控PD的输入前端增加C/L滤波器，
步骤2，获取反馈泵浦Pump 2的电流值以及对应时刻的正常工作电流值，正常工作电流值在生产测试时获得，并记录入模块内存，供模块软件判断。
步骤3，分别判断获取的反馈泵浦Pump 2的电流值是否大于最大电流值,最大电流值是指的是反馈泵浦Pump2的最大标称工作电流，同时判断反馈泵浦Pump 2的电流值是否大于2 倍的正常工作电流值；
步骤4，当反馈泵浦Pump 2的电流值大于最大电流值或者大于2倍的正常工作电流值时，触发反馈泵浦Pump 2失效告警。表1为L-band光纤放大器中前馈泵浦Pump 1失效的探测方法的测试结果对比表格，具体地，告警测试结果示意图如图2所示。
表1-L-band光纤放大器中前馈泵浦Pump 1失效的探测方法的测试结果对比表格
Figure RE-GDA0002385688780000041
进一步地，步骤2中的正常工作电流值在生产测试所得并记录入模块内存以供判断。
进一步地，步骤3的最大电流值为1090mA。
进一步地，步骤4的失效告警由用于监控输出PD的软件进行弹窗告警。
本发明采用以上技术方案，在普通的输出监控PD之前，增加一个C/L band的薄膜滤波器。如图2所示，当前馈泵浦Pump 1失效后，前级铒纤D1反转率急剧降低，从而对信号光产生强烈的吸收。失去信号光的进入，后级铒纤D2在反馈泵浦Pump 2的激励下，只能产生C-band受激自发辐射，而不能产生有效的L-band信号。通过在输出监控PD支路增加C/Lband的滤波器，可以阻止C-band受激自发辐射进入PD。使输出监控PD因为缺乏L-band信号功率而触发软件报错。作为补偿，反馈泵浦Pump 2(pump 2)会被一直驱动到电流最大值 (>1090mA)，远远高于正常工作条件所需要的电流。即使在最小功率条件上，反馈泵浦Pump 2也需要3倍的工作电流，配合软件告警逻辑即可实现失效的及时告警。
本发明仅仅是简单的增加一个C/L薄膜滤波器，就能在复杂L-band放大器中，使用现有的PD，实现前馈泵浦Pump 1失效的捕捉。避免了额外成本的增加，避免电路上的复杂设计，兼容现有的设计，极易推广。
尽管结合优选实施方案具体展示和介绍了本发明，但所属领域的技术人员应该明白，在不脱离所附权利要求书所限定的本发明的精神和范围内，在形式上和细节上对本发明做出各种变化，均为本发明的保护范围。

Claims (6)

1.一种L-band光纤放大器中前馈泵浦失效的探测结构，光纤放大器包括前馈控制器、PI控制器、输入PD和输出PD，光纤放大器的输入接入第一分光器的公共端，第一分光器的第一分光口连接第一合波器的一个输入端，第一分光器的第二分光口连接输入PD的输入端，输入PD的电输出口连接前馈控制器的输入端，前馈控制器的输出端连接前馈泵浦，前馈泵浦的输出连接第一合波器的另一输入端，第一合波器的输出端连接前级铒纤，前级铒纤的输出端连接第二合波器的一个输入端；输入PD的电输出口同时连接PI控制器的输入端，PI控制器的反馈端连接输出PD的输出端，PI控制器的输出端连接反馈泵浦，反馈泵浦的输出端连接第二合波器的另一输入端，第二合波器的输出端连接后级铒纤，后级铒纤的输出端连接第二分光器的公共端，第二分光器的第一分光口连接光纤放大器的输出端，其特征在于：第二分光器的第二分光口通过一C/L薄膜滤波器连接输出PD，C/L薄膜滤波器用于阻止C-BAND受激自发辐射进入输出PD中，输出PD上配置有监控软件，监控软件在反馈泵浦的电流值大于最大电流值或大于2倍的正常工作电流值时发出反馈泵浦失效告警。
2.根据权利要求1所述的一种L-band光纤放大器中前馈泵浦失效的探测结构，其特征在于：前级铒纤的输出端通过一增益平坦滤波器连接第二合波器的一个输入端。
3.一种L-band光纤放大器中前馈泵浦失效的探测方法，其特征在于：其包括以下步骤：
步骤1，在L-band光纤放大器的输出监控PD的输入前端增加C/L滤波器，
步骤2，获取反馈泵浦的电流值以及对应时刻的正常工作电流值；
步骤3，分别判断获取的反馈泵浦的电流值是否大于最大电流值，最大电流值指的是反馈泵浦的最大标称工作电流，同时判断反馈泵浦的电流值是否大于2倍的正常工作电流值；
步骤4，当反馈泵浦的电流值大于最大电流值或者大于2倍的正常工作电流值时，触发反馈泵浦失效告警。
4.根据权利要求3所述的一种L-band光纤放大器中前馈泵浦失效的探测方法，其特征在于：步骤2中的正常工作电流值在生产测试所得并记录入模块内存以供判断。
5.根据权利要求3所述的一种L-band光纤放大器中前馈泵浦失效的探测方法，其特征在于：步骤3的最大电流值为1090mA。
6.根据权利要求3所述的一种L-band光纤放大器中前馈泵浦失效的探测方法，其特征在于：步骤4的失效告警由用于监控输出PD的软件进行弹窗告警。
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