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ice:servo-opls [2014/06/30 21:57] – [I/O (OEM Only)] jtshugrueice:servo-opls [2021/05/20 22:42] – external edit 127.0.0.1
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 Please read [[:limited_warranty|Limited Warranty]] and [[:warnings_cautions|General Warnings and Cautions]] prior to operating the ICE-CP1. Please read [[:limited_warranty|Limited Warranty]] and [[:warnings_cautions|General Warnings and Cautions]] prior to operating the ICE-CP1.
 +
 +The guide to programming the ICE-CP1 through serial commands can be [[ice:commands:opls|found here]].  The ICE-CP1 web page can be [[https://vescent.com/us/d2-135-offset-phase-lock-servo.html|found here]].
  
 ===== Description ===== ===== Description =====
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 ===== 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
-<WRAP center round box 60%>+
 ^  Parameter  ^  Rating  ^ ^  Parameter  ^  Rating  ^
 |Environmental Temperature | >15°C and <30°C| |Environmental Temperature | >15°C and <30°C|
 |Environmental Humidity | <60% |  |Environmental Humidity | <60% | 
 |Environmental Dew Points | <15°C | |Environmental Dew Points | <15°C |
-</WRAP>+
  
  ===== Specifications  =====  ===== Specifications  =====
-<WRAP center round box 650px> +^                                                                                                                                                             ^  ICE-CP1-200                                                                                     ^  ICE-CP1-500  ^  Units   ^ 
-^ ^  ICE-CP1-200  ^  ICE-CP1-500  ^  Units  ^ +^ Current Source                                                                                                                                              ^                                                                                                  ^               ^          ^ 
-^ Current Source ^ ^ ^ ^ +| Current range                                                                                                                                               |  0-200                                                                                           |  0-500        |  mA      | 
-|<html> &nbsp;&nbsp; </html>Current range|  0-200  |  0-500  |  mA  | +| Current setpoint resolution                                                                                                                                 |  200                                                                                             |  500          |  μA      | 
-|<html> &nbsp;&nbsp; </html>Current setpoint resolution |  200  |  500  |  μA  | +| Current noise density                               |  <100                                                                                            |  <200         | pA /√Hz  | 
-|<html> &nbsp;&nbsp; </html>Current noise density((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.))|  <100  |  <200  | pA / <HTML> √<span style="text-decoration: overline;">Hz</span> </HTML> | +| RMS Noise (10Hz - 100kHz)              |  <50                                                                                             |  <100         |  nA      | 
-|<html> &nbsp;&nbsp; </html>RMS Noise (10Hz - 100kHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.))|  <50  |  <100  |  nA  | +| RMS Noise (10Hz - 1MHz)                  |  <100                                                                                            |  <150         |  nA      | 
-|<html> &nbsp;&nbsp; </html>RMS Noise (10Hz - 1MHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.))|  <100  |  <150  |  nA  | +| RMS Noise (10Hz - 10MHz)                |  <300                                                                                            |  <500         |  nA      | 
-|<html> &nbsp;&nbsp; </html>RMS Noise (10Hz - 10MHz)((All measurements guaranteed on design and verified experimentally on D2-105 which uses same circuit.))|  <300  |  <500  |  nA  | +| Absolute accuracy                                                                                                                                           |  2                                                                                                              ||  %       | 
-|<html> &nbsp;&nbsp; </html>Absolute accuracy|  2  ||  %  | +^ Offset Phase Lock Servo Input Signal                                                                                                                        ^                                                                                                                 |^          ^ 
-^ Offset Phase Lock Servo Input Signal^ ^^ ^  +| Min Offset Frequency                                                                                                                                        |  250                                                                                                            ||  MHz     | 
-|<html> &nbsp;&nbsp; </html>Min Offset Frequency |  250  ||  MHz  | +| Max Offset Frequency                                                                                                                                        |  Min: 9.5, Typical: 10(( Maximum Offset Frequency depends on power of input beat-note signal.))                 ||  GHz     | 
-|<html> &nbsp;&nbsp; </html>Max Offset Frequency |  Min: 9, Typical: 10(( Maximum Offset Frequency depends on power of input beat-note signal.))  ||  GHz  | +| Max Electronic Beat-Note Input \\ (ICE-CP1-SMA)                                                                                                             |  10                                                                                                             ||  dBm     | 
-|<html> &nbsp;&nbsp; </html> Max Electronic Beat-Note Input \\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-SMA)|  10  ||  dBm  | +| Min Electronic Beat-Note Input \\ (ICE-CP1-SMA)                                                                                                             |  -10                                                                                                            ||  dBm     | 
-|<html> &nbsp;&nbsp; </html> Min Electronic Beat-Note Input \\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-SMA)|  -10  ||  dBm  | +| Min Electronic Beat-Note S/N \\ (ICE-CP1-SMA)                                                                                                               |  >50                                                                                                            ||  dB      | 
-|<html> &nbsp;&nbsp; </html> Min Electronic Beat-Note S/N \\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-SMA)|  >50  ||  dB  | +| Max Optical Beat-Note Input \\ (ICE-CP1-FC)                                                                                                                 |  1                                                                                                              ||  mW      | 
-|<html> &nbsp;&nbsp; </html> Max Optical Beat-Note Input \\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-FC)|  1  ||  mW  | +| Min Optical Beat-Note Input \\ (ICE-CP1-FC)((Approximate value as exact value depends on wavelength of the light and spatial overlap between the lasers.))  |  50                                                                                                             ||  μW      | 
-|<html> &nbsp;&nbsp; </html> Min Optical Beat-Note Input \\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-FC)((Approximate value as exact value depends on wavelength of the light and spatial overlap between the lasers.))|  50  ||  μW  | +| Front-panel Input Connection\\ (ICE-CP1-FC)((ICE-CP1-FC is shipped with an FC to SC multimode patch cord))                                                  |  SC                                                                                                             ||          | 
-|<html> &nbsp;&nbsp; </html> Front-panel Input Connection\\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-FC)((ICE-CP1-FC is shipped with an FC to SC multimode patch cord))|  SC  ||    |  +| Front-panel Input Connection\\ (ICE-CP1-SMA)                                                                                                                |  SMA                                                                                                            ||          | 
-|<html> &nbsp;&nbsp; </html> Front-panel Input Connection\\ <html> &nbsp;&nbsp; </html><html> &nbsp;&nbsp; </html>(ICE-CP1-SMA)|  SMA  ||    |  +^ Offset Phase Lock Servo Performance                                                                                                                         ^                                                                                                                 |^          ^ 
-^ Offset Phase Lock Servo Performance^ ^^ ^  +| Bandwidth((May be limited by the bandwidth of the laser being servoed))                                                                                     |  1.5                                                                                                            ||  MHz     | 
-|<html> &nbsp;&nbsp; </html>Bandwidth((May be limited by the bandwidth of the laser being servoed))|  TBD   ||  MHz  | +| Interval reference frequency drift                                                                                                                          |  +/-20                                                                                                          ||  ppm     | 
-|<html> &nbsp;&nbsp; </html> Interval reference frequency drift |  +/-20  ||  ppm  | +| PFD Noise(( See [[#calculating_phase_noise|Calculating Phase Noise section]] for a full description))                                                       |  -213                                                                                                           ||  dBc/Hz  | 
-|<html> &nbsp;&nbsp; </html> PFD Noise(( See [[#calculating_phase_noise|Calculating Phase Noise section]] for a full description))|  -213  ||  dBc/Hz  | +^ Loop Filter Parameters                                                                                                                                      ^                                                                                                                 |^          ^ 
-^ Loop Filter Parameters ^ ^^ ^ +| Proportional Gain                                                                                                                                           |  -72 -- 0                                                                                                       ||  dB      | 
-|<html> &nbsp;&nbsp; </html>Proportional Gain  |  -72 -- 0  ||  dB  | +| Proportional Gain Resolution                                                                                                                                |  2                                                                                                              ||  dB      | 
-|<html> &nbsp;&nbsp; </html>Proportional Gain Resolution |  2  ||  dB  | +| Integrator                                                                                                                                                  |  3, 10, 30, 100, 300                                                                                            ||  kHz     | 
-|<html> &nbsp;&nbsp; </html>Integrator|  3, 10, 30, 100, 300  ||  kHz  | +| Differential                                                                                                                                                |  Off, 10, 30, 100, 300                                                                                          ||  kHz     | 
-|<html> &nbsp;&nbsp; </html>Differential |  Off, 10, 30, 100, 300  ||  kHz  | +| Differential Gain                                                                                                                                           |  18                                                                                                             ||  dB      | 
-|<html> &nbsp;&nbsp; </html>Differential Gain |  18  ||  dB  | +
-</WRAP> +
-<WRAP center round box 60%>+
 ^Electrical Specifications^^^^^ ^Electrical Specifications^^^^^
 ^ ^  Min  ^  Typical  ^  Max  ^  Units  ^ ^ ^  Min  ^  Typical  ^  Max  ^  Units  ^
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 |+15V Current Draw (ICE-CP1-500)((Current draw depends on output current to laser diode.)) |  80  | |  580  |  mA  | |+15V Current Draw (ICE-CP1-500)((Current draw depends on output current to laser diode.)) |  80  | |  580  |  mA  |
 |-15V Current Draw | |  40  | |  mA  | |-15V Current Draw | |  40  | |  mA  |
-</WRAP>+
  
 ===== Setting the Offset Frequency ===== ===== Setting the Offset Frequency =====
  
 Two numbers control the offset frequency of the ICE-CP1: The divider setting N and the reference frequency. The divider setting N can be set to N=8,16,32 or 64. The reference frequency can be generated internally with a range from 50 - 240 MHz. Or an external frequency reference can be provided (external frequency must be from 32 MHz - 240 MHz). The offset frequency of the laser is given by the following formula: Two numbers control the offset frequency of the ICE-CP1: The divider setting N and the reference frequency. The divider setting N can be set to N=8,16,32 or 64. The reference frequency can be generated internally with a range from 50 - 240 MHz. Or an external frequency reference can be provided (external frequency must be from 32 MHz - 240 MHz). The offset frequency of the laser is given by the following formula:
-<WRAP center round box 450px><html><center></html> ** Offset = N * Reference Frequency **<html></center></html></WRAP>+<WRAP center round box 260px> **Offset = N * Reference Frequency** </WRAP>
  
 The table below shows the offset range for different values of N and using the internal or external frequency reference. The table below shows the offset range for different values of N and using the internal or external frequency reference.
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 =====Understanding the Transfer Function===== =====Understanding the Transfer Function=====
  
-<imgcaption xfer_func center|Schematic of the OPLS right-side panel,showing the configurable transfer function and its user-controls.>{{ :ice:opls-loopfilter-xfer-function.jpg?nolink&700 |}}</imgcaption>+<imgcaption xferfunc|Schematic of the OPLS right-side panel, showing the configurable transfer function and its user-controls.>{{ :ice:opls-loopfilter-xfer-function.jpg?nolink&700 |}}</imgcaption>
  
  
-The charge pump in the OPLS outputs a signal proportional to the phase-error and the transfer function is as shown in <imgref xfer_func >.  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 xferfunc>.  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 xferfunc>, 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. 
  
 =====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 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:
  
-<WRAP center round box 450px><html><center></html> **D2-135 Phase-Noise Floor = -213 + 20Log(N) + 10Log(F<sub>REF</sub>)**<html></center></html></WRAP>+<WRAP center round box 450px> **D2-135 Phase-Noise Floor = -213 + 20Log(N) + 10Log(ƒ<sub>REF</sub>)**</WRAP>
  
-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 ƒ<sub>REF</sub> is the reference frequency as measured in Hz. For more details, please see this [[http://www.vescent.com/2012/calculating-phase-noise-from-the-d2-135/|application note]].
  
  
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 </WRAP> </WRAP>
  
-**Beat Note Input **+**Beat Note Monitor ** 
 + 
 +The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second bottom-most connector is an SMA which is the digitized (i.e. square-wave) version of the input beat-note after a divide-by-2. For example, if the input beat note is 6 GHz, the monitor will have a 3 GHz output.  The signal is ~0 dBm in power regardless of the strength of the input beat-note signal.
  
-The Front Panel for the ICE-CP1 has four SMA or FC connectors. The top connector (SMA for ICE-CP1-SMA, FC for ICE-CP1-FC) is the beat note signal input. When FC, this input should be a <1 mW signal containing overlapped light from both lasers. When an SMA, this input should be an electrical signal, typically the output of the D2-160. 
  
 **External Reference Frequency Input ** **External Reference Frequency Input **
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 The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second top-most connector is an SMA input for the external frequency reference. The input is AC coupled and 50 Ω terminated. Max power is 10 dBm. The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second top-most connector is an SMA input for the external frequency reference. The input is AC coupled and 50 Ω terminated. Max power is 10 dBm.
  
-**Beat Note Monitor ** +**Beat Note Input **
- +
-The Front Panel for the ICE-CP1 has four SMA or FC connectors. The second bottom-most connector is an SMA containing is the digitized (i.e. square-wave) version of the input beat-note after a divide-by-2. For example, if the input beat note is 6 GHz, the monitor will have a 3 GHz output.  The signal is ~0 dBm in power regardless of the strength of the input beat-note signal.+
  
 +The Front Panel for the ICE-CP1 has four SMA or FC connectors. The top connector (SMA for ICE-CP1-SMA, FC for ICE-CP1-FC) is the beat note signal input. When FC, this input should be a <1 mW signal containing overlapped light from both lasers. When an SMA, this input should be an electrical signal, typically the output of the D2-160.
  
 **Laser Current ** **Laser Current **
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 Only for OEM versions of the ICE-CP1 purchased without the [[ice:enclosure|ICE-Box]]. Only for OEM versions of the ICE-CP1 purchased without the [[ice:enclosure|ICE-Box]].
 </WRAP> </WRAP>
 +
 +<imgcaption pcbDimensions|Connector and component positions on PCB.>{{ :ice:vpn00320_dimensions.jpg |}}</imgcaption>
  
 **Beat Note Input ** **Beat Note Input **
ice/servo-opls.txt · Last modified: 2021/08/26 15:26 by 127.0.0.1