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1. 发明申请

US20090141757A1 OPTICAL AMPLIFIERS 审中-公开
标题翻译：光放大器
公开(公告)号：US20090141757A1
公开(公告)日：2009-06-04
申请号：US12267644
申请日：2008-11-10
申请人： Andrew John Parker , Jonathan Stuart Drake , Michael Biddle
发明人： Andrew John Parker , Jonathan Stuart Drake , Michael Biddle
IPC分类号： H01S3/04 , H01S3/00
摘要： An optical amplifier comprises an optical fibre, a pump laser for optically pumping the optical fibre to amplify an optical signal, a TEC 1 for cooling the pump laser on receipt of a cooling current, a temperature sensor 2 for monitoring the temperature of the amplifier housing; and a control circuit 3 for controlling the cooling current in dependence on a sensing output from the temperature sensor 2, so as to maintain the temperature of the pump laser at a temperature set point. The control circuit 3 is configured (i) to maintain the temperature of the pump laser at a first temperature set point within a predetermined temperature range of the amplifier, and (ii) to maintain the temperature of the pump laser at a second temperature set point, higher than the first temperature set point, when the sensing output from the temperature sensor 2 exceeds a threshold value. The feature that the temperature set point is raised to a higher level when the temperature of the pump laser goes above a preset level reduces the amount of self-heating of the pump laser, and thus prevents a thermal runaway situation.
摘要翻译：一种光放大器，包括光纤，用于光学泵浦光纤放大光信号的泵浦激光器，用于在接收到冷却电流时冷却泵激光器的TEC1;用于监视放大器壳体的温度的温度传感器2 ; 以及用于根据来自温度传感器2的感测输出来控制冷却电流的控制电路3，以将泵浦激光器的温度保持在温度设定点。控制电路3被配置为（i）将泵浦激光器的温度保持在放大器的预定温度范围内的第一温度设定点，和（ii）将泵浦激光器的温度保持在第二温度设定点高于第一温度设定点，当温度传感器2的感测输出超过阈值时。当泵浦激光器的温度超过预设值时，温度设定点升高到较高水平的特征降低了泵浦激光器的自加热量，从而防止了热失控的情况。

2. 发明授权

US07139118B2 Optical amplifiers 有权
标题翻译：光放大器
公开(公告)号：US07139118B2
公开(公告)日：2006-11-21
申请号：US11146709
申请日：2005-06-07
申请人： Roger David Griggs , Clive John Palmer , Andrew John Parker , Timothy Andrew Semmens
发明人： Roger David Griggs , Clive John Palmer , Andrew John Parker , Timothy Andrew Semmens
IPC分类号： H01S3/00
CPC分类号： H01S3/06754 , H01S3/06758 , H01S3/10015 , H01S3/10023 , H01S3/1301 , H01S2301/02 , H04B10/2942 , H04B2210/003
摘要： A multistage optical amplifier is controlled to compensate for the effect of amplified spontaneous emission (ASE) by a method comprising the following steps. Optical input and output signals to a first gain stage are detected, and the drive current to the first gain stage is controlled in dependence on the optical input signal to the first gain stage. Optical input and output signals to a last gain stage are detected, and the drive current to the last gain stage is controlled to maintain the output power of the last gain stage substantially constant. The effect of ASE in the first gain stage is compensated for by applying a correction factor based on the ASE of the first gain stage and the output power of the first gain stage. The drive current supplied to the first gain stage is controlled to zero in on an error signal of the general form: (Total Power at B−Stage 1 ASE)−(A+Stage 1 Gain) where Total Power at B is the power of the output signal from the first gain stage, and A is the input signal of the first gain stage. Furthermore the drive current supplied to the last gain stage is controlled to zero in on an error signal of the general form: (Total Power at E−Stage 2 ASE)−(D+Stage 2 Gain) where Total Power at E is the power of the output signal from the last gain stage, and D is the input signal of the last gain stage. In this method the correction factor is calibrated in the gain control mode and is subsequently applied in the power control mode, and this therefore simplifies the calibration procedure.
摘要翻译：控制多级光放大器以通过包括以下步骤的方法来补偿放大的自发发射（ASE）的影响。检测到第一增益级的光输入和输出信号，并且根据到第一增益级的光输入信号来控制到第一增益级的驱动电流。检测到最后一个增益级的光输入和输出信号，并控制到最后一个增益级的驱动电流，以保持最后增益级的输出功率基本恒定。 ASE在第一增益级中的作用通过应用基于第一增益级的ASE和第一增益级的输出功率的校正因子来补偿。提供给第一增益级的驱动电流在一般形式的误差信号上被控制为零：<？in-line-formula description =“在线公式”end =“lead”？>（B处的总功率 - 1号增益） - （A +阶段1增益）<？in-line-formula description =“在线公式”end =“tail”？>其中B处的总功率是第一个输出信号的功率增益级，A为第一增益级的输入信号。此外，提供给最后一个增益级的驱动电流在一般形式的误差信号上被控制为零：<？in-line-formula description =“在线公式”end =“lead”？>（总功率 E阶段2 ASE） - （D +阶段2增益）<？in-line-formula description =“在线公式”end =“tail”？>其中E处的总功率是来自最后一个增益级，D是最后一个增益级的输入信号。在该方法中，校正因子在增益控制模式下被校准，随后在功率控制模式中被应用，因此简化了校准过程。

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