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d2:offset_phase_lock_servo [2018/12/05 16:35] – [Understanding the Transfer Function] Michael Radunsky | d2:offset_phase_lock_servo [2019/11/20 02:01] – [Options] 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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The D2-135 comes in two different versions: | The D2-135 comes in two different versions: |
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*//D2-135-SMA - //SMA input of the electrical beat-note | *//D2-135-SMA// SMA input of the electrical beat-note |
*//D2-135-FC-800// - Fiber-input of optical beat-note for wavelengths 750nm - 870nm (obsolete) | *//D2-135-FC-800// - Fiber-input of optical beat-note for wavelengths 750nm - 870nm (obsolete) |
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The D2-135-SMA requires an electrical signal input between 10 and -10 dBm of power. | The D2-135-SMA requires an electrical signal input between 10 and -10 dBm of power. |
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The D2-135-FC-800 is no longer available, but information regarding it is retained for those users who have purchased this model. It includes a 10 GHz GaAs high-speed photo-detector for converting the input optical beat-note into a electrical beat-note. The maximum optical input power is 1 mW. //Warning: input powers over 1mW of optical power can damage the OPLS.// A minimum of 50 μW of power in the optical beat-note is required(( Note the power in the beat-note is not the same as total power. Because the optical input uses multi-mode fiber, the spatial mode overlap between the two lasers is not guaranteed. If the overlap between the two lasers is poor, there can be very little power in the beat-note despite large optical power. )). | The D2-135-FC-800 is no longer available, but information regarding it is retained for those users who have purchased this model. It includes a 10 GHz GaAs high-speed photo-detector for converting the input optical beat-note into a electrical beat-note. The maximum optical input power is 1 mW. //Warning: input powers over 1mW of optical power can damage the internal photodetector.// A minimum of 50 μW of power in the optical beat-note is required(( Note the power in the beat-note is not the same as total power. Because the optical input uses multi-mode fiber, the spatial mode overlap between the two lasers is not guaranteed. If the overlap between the two lasers is poor, there can be very little power in the beat-note despite large optical power. )). |
===== Absolute Maximum Ratings ===== | ===== Absolute Maximum Ratings ===== |
Note: All modules designed to be operated in laboratory environment | Note: All modules designed to be operated in laboratory environment |
=====Calculating Phase Noise ===== | =====Calculating Phase Noise ===== |
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The phase-noise specified in Section 1.3 is referenced to the phase frequency detector (PFD) at 1 Hz. To convert that to the noise measured on the actual beat-note, it must be rescaled with the following formula: | The phase-noise specified in the [[d2:offset_phase_lock_servo#specifications|Specifications]] above is referenced to the phase frequency detector (PFD) at 1 Hz. To convert that to the noise measured on the actual beat-note, it must be rescaled with the following formula: |
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''D2-135 Phase-Noise Floor = -213 + 20Log(N) + 10Log(F<sub>REF</sub>)'' | ''D2-135 Phase-Noise Floor = -213 + 20Log(N) + 10Log(F<sub>REF</sub>)'' |
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where N is the value of the divider and F<sub>REF</sub> is the reference frequency as measured in Hz. For more details, please see [[http://www.vescent.com/2012/calculating-phase-noise-from-the-d2-135/|http://www.vescent.com/2012/calculating-phase-noise-from-the-d2-135/]] . | where N is the value of the divider and F<sub>REF</sub> is the reference frequency as measured in Hz. For more details, please see [[http://www.vescent.com/2012/calculating-phase-noise-from-the-d2-135/|Calculating Phase Noise from the D2-135]]. |
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=====Help ===== | =====Help ===== |