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Comparison between first-order and second-order optical phase-lock loops

机译:一阶和二阶光学锁相环的比较

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A comparison between the performance of modified first-order and second-order optical phase-lock loops (OPLL's) is made, revealing that the modified first-order loop offers better performance when long loop delay time is present and a wide bandwidth loop filter is used. The introduction of a 10 dB gain margin from the critical gain can be used to keep the damping close to that expected when the delay time is negligible. If OPLL design is optimized for this gain margin and 5 MHz linewidth lasers are used, the increase in the phase-error variance with delay time is 54 rad/sup 2///spl mu/s for a modified first-order and 80 rad/sup 2///spl mu/s for a second-order loop, confirming that modified first-order loops are less sensitive to loop delay.
机译:比较了修改后的一阶和二阶光学锁相环(OPLL)的性能,发现当存在较长的环路延迟时间并且使用宽带宽环路滤波器时,修改后的一阶环路可提供更好的性能。用过的。当延迟时间可以忽略不计时,可以从临界增益引入10 dB的增益裕度,以使阻尼保持接近预期值。如果针对此增益裕量优化OPLL设计并使用5 MHz线宽激光器,则对于修改的一阶和80 rad,相位误差方差随延迟时间的增加为54 rad / sup 2 /// spl mu / s。 / sup 2 //// spl mu / s用于二阶循环,确认修改后的一阶循环对循环延迟不太敏感。

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