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| d2:offset_phase_lock_servo [2018/12/05 16:34] – [Table] Michael Radunsky | d2:offset_phase_lock_servo [2019/05/24 15:40] – [Offset Phase Lock Servo] Michael Radunsky |
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| Please read [[:limited_warranty|Limited Warranty]] and [[:warnings_cautions|General Warnings and Cautions]] prior to operating the D2-135. | Please read [[:limited_warranty|Limited Warranty]] and [[:warnings_cautions|General Warnings and Cautions]] prior to operating the D2-135. |
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| [[d2:quick_start_opls|A quick-start guide]] is available for the D2-135. | [[d2:quick_start_opls|A quick-start guide]] is available for the D2-135.\\ |
| | [[https://www.vescent.com/products/electronics/d2-135-offset-phase-lock-servo/|D2-135 Web page]] |
| =====Description===== | =====Description===== |
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| =====Understanding the Transfer Function===== | =====Understanding the Transfer Function===== |
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| The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref opls_side_panel>. However, the OPLS will typically be used to control a //frequency//-tunable device (such as a laser). In this configuration, the effective loop filter is not the one shown in <imgref opls_side_panel>, but includes a extra integration corresponding to converting the phase-error input to a frequency error. Thus, ω<sub>I </sub>sets the frequency transition from single-integration to double-integration and ω<sub>I</sub> from single-integration to proportional feedback. It is important to understand this 'hidden' integrator when configuring the loop filter parameters. | The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref opls_side_panel>. However, the OPLS will typically be used to control a //frequency//-tunable device (such as a laser). In this configuration, the effective loop filter is not the one shown in <imgref opls_side_panel>, but includes a extra integration corresponding to converting the phase-error input to a frequency error. Thus, ƒ<sub>I </sub>sets the frequency transition from single-integration to double-integration and ƒ<sub>I</sub> from single-integration to proportional feedback. It is important to understand this 'hidden' integrator when configuring the loop filter parameters. |
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| =====Calculating Phase Noise ===== | =====Calculating Phase Noise ===== |
