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DET01CFC, DET01CFC/M
Fiber InputInGaAs Biased Detector
User Guide
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Chapter 1
Chapter 1 Warning Symbol DefinBelow is a list of warning symbols you may encounter device.
Symbol Description
Direct Current
Alternating Current
Both Direct and Alternating Curre
Earth Ground Terminal
Protective Conductor Terminal
Frame or chassis Terminal
Equipotentiality
On (Supply)
Off (Supply)
In Position of a Bi-Stable Push C
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InGaAs Biased Detector
Chapter 2 DescriptionThe DET01CFC is a ready-to-use, high-speed InGaAs pFC/PC connectorized fiber optic cables in NIR optical with an FC/PC bulkhead connector, detector, and 12V compact aluminum housing. The FC/PC connector p
fiber-based light sources. The output uses an SMA jamaximize frequency response. The maximum bandwoperate over the spectral range of 800-1700nm. DET02AFC, is also available and operates in the 400-11
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Chapter 3 SetupThe detector can be set up in many different ways usadapters. However, the detector should always be mouoperation. Step 1 in the setup instructions below odetector onto a post.
1. Unpack the optical head, install a Thorlabs TR-serone of the #8-32 (M4 on /M version) tapped hole, loside of the sensor, and mount into a PH-series post
2. Attach a 50 SMA to Coax cable (i.e. CA28xx) tSelect and install a terminating resistor to the rem(BNC Side) and connect to a voltage measuremenpage 5to determine resistor values. Thorlabs sells afor best frequency performance and a variable tevoltage flexibility. Note the input impedance of ysince this will act as a terminating resistor. A loadwhen using current measurement devices.
3. Apply a light source to the detector.
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InGaAs Biased Detector
Chapter 4 Operation
4.1. Theory of Operation
A junction photodiode is an intrinsic device, which ordinary signal diode, but it generates a photocurrent the depleted region of the junction semiconductor. A pdevice that exhibits high quantum efficiency based uponvariety of different applications.
It is necessary to be able to determine correctly the levexpect and the responsivity based upon the incident liga junction photodiode model with basic discrete componmain characteristics and gain a better understanding of
photodiodes.
= +
Photodetector
Diode Junction
Capacitance
R
IPD ID
Figure 1 Photodiod e Model
4 2 Responsivity
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InGaAs Biased Detector
The table below gives some advantages to each c
material.
MaterialDark
Current Speed
Silicon (Si) Low High
Germanium (Ge) High Low
Gallium Phosphide (GaP) Low High Indium Gallium Arsenide(InGaAs)
Low High
Extended Range: IndiumGallium Arsenide (InGaAs)
High High
4.5. Junction Capacitance
Junction capacitance (CJ) is an important property of have a profound impact on the bandwidth and the resreaffirms that larger diode areas encompass a greaincreased charge capacity. In a reverse bias applicatio
the junction increases, thus effectively reducing the jincreasing the response speed.
4.6. Bandwidth and Response
A load resistor will react with the photodetector junctiobandwidth. For best frequency response, a 50 term
conjunction with a 50 coaxial cable. The bandwidtresponse (tr ) can be approximated using the junction cresistance (RLOAD):
= 1( )
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4.7. Terminating Resistance
We use a load resistance convert the generated pho(VOUT) for viewing on an oscilloscope:
= ×
Depending on the type of the photodiode, load reresponse speed. For maximum bandwidth, we recomm
cable with a 50 terminating resistor at the opposite eminimize ringing by matching the cable with its chabandwidth is not important, you may increase the amolight level by increasing RLOAD. In an unmatched termcoaxial cable can have a profound impact on recommendable to keep the cable as short as possible.
4.8. Shunt Resistance
Shunt resistance represents the resistance of the junction. An ideal photodiode will have an infinite shuvalues may range from the order of ten to thousandson the photodiode material. For example, and InGaA
resistance in the order of 10 M while a Ge detector is significantly affect the noise current on the photodiodhowever, the high resistance produces little effect and m
4.9. Series Resistance
Series resistance models the resistance of the semico
ignore this low resistance. The series resistance arises wire bonds of the photodiode; this mainly determiphotodiode under zero bias conditions.
4 10 Damage Threshold
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InGaAs Biased Detector
4.11. Battery Replacement
Thorlabs delivers each DET with an A23 12 V batteryreadily available at most retail stores, as well as throusupplied will deliver about 40 hours with a 1 mA loadcontinuous 1.5 mW light source at peak wavelength. Wthe supply current turns out to be very small and the bat
Locate the battery cap directly above the output BNCremove the battery. Install the new battery into the cathread back into the DET. Be careful not to cross thread
CAUTION: The DET does not include a protection diothe installation of the battery is backwards. The battery housing.
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Chapter 5
Chapter 5 Common Operating Ci
Figure 2 Basic DET Circuit
The DET Series Detectors are designed according thThe detector is reverse biased to produce a linear res
light. The generated photocurrent is based upon wavelength and can be viewed on the oscilloscope by aon the output. The function of the RC Filter is to filter from the input supply, which may contribute to a noisy o
On/OffSwitch
Protection Diode
V BAT
RC Filter
Resistor
1 k Ω
Capacitor 0.1 µF
V Bias
GND
Battery
VoltageRegulator
5V
Out
Feedback
RF
A
B
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InGaAs Biased Detector
One can also use a photodetector with an amplifier for
high gain. The user can choose whether to opePhotoconductive modes. There are a few benefits of cho
• Photovoltaic Mode: We maintain the circuit photodiode, holding point A at the same pooperational amplifier. This eliminates the possi
• Photoconductive mode: We reverse bias the pbandwidth while lowering the junction capacdetector is dependent on the feedback elemethe detector can be calculated using the follow
(−3) =
4 ×
, Where GBP is the amplifier product gain-bandof the junction capacitance, amplifier capcapacitance.
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Chapter 6 TroubleshootingProblem Suggest
There is no signal response orresponse is slower thanexpected.
Verify that the battery is power (>9V)
Verify the proper termin
using a Voltage measurVerify that the optical sigspecified wavelength ra
Verify that the optical sigdetector active area.
Connect the DET to an oterminating resistor insta
oscilloscopes will have aPoint the detector towarverify that a 60 Hz (50 Happears on the scope. Ifoperating properly and tlight source or alignmen
There is an AC signal present
when the unit is turned off.
The detector has an AC
the switch in the OFF pooutput response to an Athis state. However, becunbiased, operation in threcommended.
The output appears AC coupledwith long rise times and thepower switch ON.
This is usually an indicalow and needs to be chaReplacement Section fo
Skewed Rise and Fall Times Check to see if the batteMake sure you are not scan lead to permanent d
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7.1. Response Curve
0
0.2
0.4
0.6
0.8
1
1.2
800 900 1000 1100 1200 1300 14
R e s p o n s i v i t y ( A / W )
Wavelength (nm)
Spectral Response
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InGaAs Biased Detector
7.2. Mechanical Drawing
Visit the web for a more detailed mechanical drawing.
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Chapter 8
Chapter 8 Certificate of Conforma
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InGaAs Biased Detector
Chapter 9 Regulatory As required by the WEEE (Waste Electrical and Electroof the European Community and the corresponding natiall end users in the EC the possibility to return “end of ldisposal charges.
• This offer is valid for Thorlabs electrical and ele
• Sold after August 13, 2005
• Marked correspondingly with the crossed ou“wheelie bin” logo (see right)
• Sold to a company or institute within the EC
• Currently owned by a company or institutewithin the EC
• Still complete, not disassembled and nocontaminated
As the WEEE directive applies to self containedoperational electrical and electronic products, this end olife take back service does not refer to other Thorlabs pr
• Pure OEM products, that means assemblies touser (e.g. OEM laser driver cards)
• Components
• Mechanics and optics
• Left over parts of units disassembled by the us
If you wish to return a Thorlabs unit for waste recoveryor your nearest dealer for further information.
9.1. Waste Treatment is Your Own Res
If you do not return an “end of life” unit to Thorlabscompany specialized in waste recovery Do not dispos
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Chapter 10: T
Chapter 10 Thorlabs WorldwUSA, Canada, and South AmericaThorlabs, Inc.56 Sparta AvenueNewton, NJ 07860USA
Tel: 973-300-3000Fax: 973-300-3600www.thorlabs.comwww.thorlabs.us (West Coast)Email: sales@thorlabs.comSupport: techsupport@thorlabs.com
EuropeThorlabs GmbHHans-Böckler-Str. 685221 DachauGermanyTel: +49-(0)8131-5956-0Fax: +49-(0)8131-5956-99
www.thorlabs.deEmail: europe@thorlabs.com
UK and IrelanThorlabs Ltd.1 Saint ThomCambridgeshGreat BritainTel: +44 (0)13Fax: +44 (0)1
www.thorlabsEmail: sales.ukSupport: techsu
FranceThorlabs SAS109, rue des Côtes78600 Maisons-LaffitteFranceTel: +33 (0) 970 444 844Fax: +33 (0) 825 744 800www thorlabs com
ScandinaviaThorlabs SweMölndalsväge412 63 GötebSwedenTel: +46-31-7Fax: +46-31-7www thorlabs
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