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U S E R ’ S G U I D E

Nanosecond
Photodetectors

Models 1621 & 1623

5215 Hellyer Ave. • San Jose, CA 95138-1001 • USA

phone: (408) 284–6808 • fax: (408) 284–4824

e-mail: [email protected] • www.newfocus.com

162x nanosec revB.fm Page 1 Friday, August 17, 2001 5:51 PM

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Summary of Contents for 1621

Page 1: ...nosecond Photodetectors Models 1621 1623 5215 Hellyer Ave San Jose CA 95138 1001 USA phone 408 284 6808 fax 408 284 4824 e mail contact newfocus com www newfocus com 162x nanosec revB fm Page 1 Friday August 17 2001 5 51 PM ...

Page 2: ...expressed or implied and does not cover incidental or consequential loss Information in this document is subject to change without notice Copyright 2001 1999 New Focus Inc All rights reserved The symbol and NEW FOCUS Inc are registered trademarks of New Focus Inc Document Number 162107 Rev B 162x nanosec revB fm Page 2 Friday August 17 2001 5 51 PM ...

Page 3: ...tor 9 Checking and Replacing the Battery 10 General Features and Principles 11 Photoreceiver Circuitry 11 Frequency and Time Response 11 Using Filters and Optical Fiber 15 Characteristics 17 Physical Specifications 17 Photodetector Specifications 18 Customer Service 19 Technical Support 19 Service 19 162x nanosec revB fm Page 3 Friday August 17 2001 5 51 PM ...

Page 4: ...4 Contents NEW FOCUS Inc 162x nanosec revB fm Page 4 Friday August 17 2001 5 51 PM ...

Page 5: ...on page 17 This product is ideal for detecting light pulses or monitoring optical signals from DC to several hundred MHz where an electronic amplifier is not required The large diameter detectors and the DC response make alignment and operation of the Model 162X easy Figure 1 shows the typical responsivity curves for the photodetectors used in the Models 1621 and 1623 Model Wavelength Type Diam 16...

Page 6: ...switches and BNC output connector are located on top of the receiver for easy access Figure 2 Model 162X casing A full mechanical diagram of the Model 162X casing is available on page 17 0 0 0 2 0 4 0 6 0 8 1 0 Wavelength nm 200 400 600 800 1000 1200 1400 1600 1800 2000 Responsivity A W Model 1621 Model 1623 Photodetector Power switch Battery check LED Load resistor switch Output BNC 8 32 M4 Mount...

Page 7: ...hen attaching the casing to a post or pedestal or the threaded insert can strip out of the plastic pad 3 Connect the detector output Connect your voltmeter oscilloscope or other instrument to the Output BNC connector on top of the detector 4 Turn the power switch to on The output voltage should register on your scope or instrument 5 Align an optical beam onto the detector Be careful to keep the op...

Page 8: ...out put voltage can only rise up to the battery volt age 9 V when the battery is fresh If you use the 1 MΩ input impedance of an oscilloscope satura tion is even easier to reach 4 Select the 50 Ω resistor or supply your own small load resistance suitable to your gain and frequency response requirements Make fine adjustments to the photodiode position until the maximum signal is achieved To compute...

Page 9: ...t If you terminate this transmission line with a non 50 Ω load you should expect degraded frequency response When you use 50 Ω impedance equipment you should switch the nanosecond photodetector into the Open position If you leave the internal 50 Ω resistor switched in the photocurrent will be divided between the two loads cutting your signal in half If you leave the internal 10 kΩ resistor switche...

Page 10: ...osition If the green LED lights up the battery is in good condition When the battery voltage falls below about 6 5 volts the green LED will not light up and the battery should be replaced Replacing the Battery 1 Turn the red power switch to off to prevent damage to the receiver 2 Remove the screw on the back of the photode tector casing and remove the back cover 3 Unplug the old battery 4 Install ...

Page 11: ... V A and can be used for alignment pur poses and for detecting low power pulses The Open setting allows you to hook up your own external load resistor and choose the best gain bandwidth combina tion for your application Figure 3 Functional schematic of the Model 162X circuitry Frequency and Time Response The nanosecond photodetector circuitry is quite straightforward consisting only of the photodi...

Page 12: ...ent you from achieving nanosecond response times BNC connectors do not match 50 Ω transmission lines well for frequencies above 100 MHz The frequency response is therefore not flat between 100 MHz and 500 MHz Above 500 MHz the situation can be worse with typi cal BNC connectors and cables proving to be quite lossy Therefore while the time response of the nano second detector is quite fast it is no...

Page 13: ...ited and the response speed will typically be 50 ns Figure 5 Typical pulse response for the a Model 1621 and b Model 1623 photodetectors 0 2 4 6 8 10 Time ns a Model 1621 0 2 4 6 8 10 Time ns b Model 1623 A 0 15 ps pulse at 1 06 µm was used to test the photodetectors and the output was measured using a 12 GHz oscilloscope 162x nanosec revB fm Page 13 Friday August 17 2001 5 51 PM ...

Page 14: ...14 General Features and Principles NEW FOCUS Inc 162x nanosec revB fm Page 14 Friday August 17 2001 5 51 PM ...

Page 15: ...o attenuate the optical power incident on the photodetector The Model 1280 has a plastic ring for mounting a filter that is up to about 0 25 6 4 mm thick A thicker optic can be held in place using the 6 32 nylon tipped set screw Use a 1 16 or 1 5 mm Allen key or ball driver to adjust the set screw The Model 1281 FC fiber adapter allows you to connect an FC connectorized fiber to the front of the p...

Page 16: ...15 9 Model 1280 patent pending dia 1 30 33 0 holes for tightening 1 04 32 thread Retaining ring for holding 1 or 25 mm optics 6 32 nylon tipped setscrew for holding 1 or 25 mm optics 0 13 3 2 FC connector holes for tightening 1 04 32 thread 0 35 8 9 0 19 4 8 Model 1281 162x nanosec revB fm Page 16 Friday August 17 2001 5 51 PM ...

Page 17: ...ations Figure 7 Mechanical drawing of the Model 162X casing 4 03 102 3 1 00 25 4 1 25 31 8 1 040 32 Threaded hole 1 16 29 5 Battery check LED 2 50 63 5 Output BNC Load resistor switch Power switch 8 32 M4 Threaded insert 162x nanosec revB fm Page 17 Friday August 17 2001 5 51 PM ...

Page 18: ...800 nm 1 0 A W at 1600 nm Maximum Optical Power 50 mW 50 mW Load Resistors 50 Ω 10 kΩ and Open user provided 50 Ω 10 kΩ and Open user provided Typical Rise Time 1 nanosecond 50 Ω setting 1nanosecond 50 Ω setting Typical detector capacitance 3 pF 0 8 pF Electrical Output Connector BNC BNC Power Requirements One 9 volt alkaline battery One 9 volt alkaline battery Typical Battery Lifetime 500 hours 5...

Page 19: ...gh Friday excluding holidays Toll Free 1 866 NUFOCUS 1 866 683 6287 from the USA Canada only Phone 408 284 6808 Support is also available by fax and email Fax 408 980 8883 Email techsupport newfocus com We typically respond to faxes and email within one business day Service In the event that your photodetector malfunctions or becomes damaged please contact New Focus for a return authorization numb...

Page 20: ...20 Customer Service NEW FOCUS Inc 162x nanosec revB fm Page 20 Friday August 17 2001 5 51 PM ...

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