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--- d2:beat_note_detector [2014/10/30 14:55] – [Specifications] Michael Radunsky
+++ d2:beat_note_detector [2021/08/26 15:26] (current) – external edit 127.0.0.1
@@ Line 12: / Line 12: @@
 Please read [[:limited_warranty|Limited Warranty]] and [[:warnings_cautions|General Warnings and Cautions]] prior to operating the D2-160. All specifications subject to change without notice.
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 The Vescent Photonics D2-160 high-speed detector has a full 9.3 GHz bandwidth for capturing beat notes between lasers of different frequencies. Simply overlap the master and slave lasers and launch into the included multimode fiber for measuring the relative frequencies of the two lasers. The D2-160 is compatible with both the Vescent [[d2:heterodyne_module|D2-150 Heterodyne Module]] and the [[d2:offset_phase_lock_servo|D2-135 Offset Phase Lock Servo]]. In combination, a true phase lock between a pair of lasers with a user-defined frequency offset can be established. The D2-160 is also compatible with the new [[:ice|ICE]]<sup>TM</sup> (Integrated Control Electronics) architecture. The D2-160 can also capture fast rising edges of laser pulses for timing, triggering, and pulse synchronization.This digitizing high-speed pre-amplified detector converts an oscillating optical signal (a beat note) into an electrical high/low signal. It works great for measuring beat note frequencies or high-speed timing. It is not suitable for measuring optical power or other amplitude characteristics due to the digitized output.
+=====Purchase Includes=====
+  * D2-160 Beat Note Detector
+  * 18 GHz RF SMA Cable (6 ft)
+  * VPN00460 FC/APC to SC MM patch cord (6 ft)
+Also look for:
+  * VPN00410 Hirose-to-D Sub 9-pin (shipped under separate line item; specify for use with D2) or
+  * VPN00475 Hirose-to-Hirose power cord (shipped under separate line item; specify for use with ICE)
 ===== Absolute Maximum Ratings =====
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 ^Output Connection |  SMA  | |
 ^Pulse Rise Time |  <25  | ps |
-^Power Requirements |  +5V (pin 4), GND (pin 6)  | |
+^Power Requirements |  +5V (pin 4), GND (pin 6)  |  Hirose  |
+^For Hirose to DB9 Power Cable |  +5V (pin 4 on Hirose to pins 6 & 7 on DB9), GND (pin 6 on Hirose to pins 1 & 2 on DB9)  |  Hirose  |
 ^Dimensions |  1.38 x 1.25 x ~1.7  | inches |
 </WRAP>
+__
 =====Operating Instructions=====
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 ==Powering the D2-160==
-The D2-160 requires +5 VDC and ground to operate.  The power input is via a female 6-pin [[http://www.digikey.com/product-detail/en/HR25-7TR-6SA/HR743-ND/363242|Hirose connector (HR25-7TR-6SA)]]. If you are making your own power cable, pin 4 is +5 V and pin 6 is ground.  Use a 6-pin male Hirose connector (get part number and link).
+<WRAP center round important 60%>
+Never connect this device to a power supply that is switched on and supplying power.  Always turn off the power supply, make connections to this device, and then re-energize the power supply.
+</WRAP>
+The D2-160 requires +5 VDC and ground to operate.  The power input is via a female 6-pin Hirose connector [[http://www.digikey.com/product-search/en?KeyWords=HR10A-7TR-6SA(73)&WT.z_header=search_go|HR10A-7TR-6SA(73)]]. If you are making your own power cable, pin 4 is +5 V and pin 6 is ground.  Use a 6-pin male Hirose connector [[http://www.digikey.com/product-search/en?KeyWords=HR10A-7TP-6P(73)&WT.z_header=search_go|HR10A-7TP-6P(73)]].  Depending on your order configuration, you should have received a power cable with this connector on one end and either the same on the other (typically for using with ICE products) or a DB-9 connector (with D2-products).
+If you are using the supplied DB9-to-Hirose cable, but not a Vescent D2-005 power supply, the table above details which pins on the DB9 require which voltages.  The figure below may be useful.
+<imgcaption image1|Pin numbering on female Hirose 6-pin connector>{{:d2:d2-160:hirose-connector.png?200 }}</imgcaption>
+==Detector Description==
 Unlike high-speed analog photo-detectors, the output of the D2-160 is not proportional to the input signal strength. The output of the D2-160 is digitized, which makes its output largely independent of the input signal strength. You cannot use the output to calculate the input power. The output is [[http://en.wikipedia.org/wiki/Current-mode_logic|CML]], which will have a DC output value of ~2.8V both with and without input signal. The best way to look at the output from the D2-160 is on a spectrum analyzer (or with the [[d2:offset_phase_lock_servo|D2-135]]). Take care you put a DC-block in front of the spectrum analyzer as the D2-160 outputs a DC voltage. On the spectrum analyzer, you will be able to see the spectrum of the optical beat-note input into the detector.