Det01cfc High Speed Detector Ingaas

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DET01CFC, DET01CFC/M

Fiber InputInGaAs Biased Detector

User Guide



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



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



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.




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




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( )



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




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.



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




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.



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



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




7.2. Mechanical Drawing

Visit the web for a more detailed mechanical drawing.



Chapter 8

Chapter 8 Certificate of Conforma




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



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: [email protected]: [email protected]

EuropeThorlabs GmbHHans-Böckler-Str. 685221 DachauGermanyTel: +49-(0)8131-5956-0Fax: +49-(0)8131-5956-99

www.thorlabs.deEmail: [email protected]

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



www.thorlabs.com

Det01cfc High Speed Detector Ingaas

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