Tti Tia-525 User manual

TIA-525

Optical/Electrical Converter

Terahertz Technologies Inc.169 Clear Road Oriskany NY 13424 (315) 736-3642 FAX (315) 736-4078

E-mail [email protected]

4/2011

Operating Instructions

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

Introduction..................................................................................................................... 1

Unpacking and Inspection .............................................................................................. 1

Battery Replacement...................................................................................................... 2

Controls .......................................................................................................................... 2

Operating Considerations........................................................................................... 3, 4

Spectral Response ........................................................................................................ .4

Typical Waveforms ........................................................................................................ .5

Speciﬁcations ................................................................................................................. 6

Limited Warranty ............................................................................................................ 7

Repair Information.......................................................................................................... 7

Contents

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

Introduction

The TIA-525 Optical to Electrical Converter is a convenient battery-operated detector/ampliﬁer com-

bination that mounts directly on the input of an oscilloscope, digitizer, or other readout device. With a

band width of DC to 125 MHz, it accurately provides an electrical replica of the optical signal present-

ed to it. It is fully capable of driving a 50 ohm cable terminated in its characteristic load.

Two basic models of the unit exist; the TIA-525S, containing a silicon detector for use in the spec-

tral region between 400 and 1000 nm, and the TIA-525 I which contains an Indium-Gallium-Arsenide

detector and is responsive in the 900 to 1700 nm spectral region. Both units are equipped with an ST

ﬁber optic connector. Custom versions are also available with unconnectorized detectors for free-

space beams.

The TIA-525 has selectable transimpedances of 1.4 KΩand 14 KΩplus a post ampliﬁer with

selectable gains of 1 or 10. Thus the overall responsivity ranges from approximately 1, 000 V/W to

100, 000 V/W at the peak of the detector response curve. Interstage coupling may be switched from

DC to AC to avoid saturation of the second stage in those cases where the signal of interest is com-

bined with a relatively large DC optical component

Each unit is powered by a self-contained 9 V lithium battery or a universal wall mount power supply.

Battery operation eliminates ground loops and the undesirable effects of conducted radiation that may

be present on local power lines.

1

Unpacking and Inspection

Prior to shipment this instrument was inspected and found to be free of mechanical and electrical

defects. Upon acceptance by the carrier he assumes responsibility for its safe arrival. After unpack-

ing, examine the unit for any evidence of shipping damage. Should you receive this instrument in a

damaged condition, apparent or concealed, it must be noted on the freight bill or express receipt and

signed by the carrier’s agent. Failure to do so could result in the carrier refusing to honor the claim.

Upon ﬁling a claim TTI should be notiﬁed.

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

2

Controls

Selects gain of second stage

Selects transimpedance

of ﬁrst stage

Selects interstage coupling

Applies power to the unit

Battery Replacement

Each unit comes equipped with a 9 V Lithium battery that provides power to the unit for approximately

30 hours of operation. It is recommended that the battery be replaced whenever the output signal

becomes clipped at 1 volt or less. When replacing the battery,

a Lithium unit should be used. Conventional 9 V alkaline batteries may be used if so desired but the

useful life will only be about 25

% ( 8 hours) of that of the much higher capacity Lithium types. TTI can supply these batteries if de-

sired. Replacement of the battery may be accomplished by removing the four 2-56 Philips ﬂat head

screws that retain the bottom cover of the TIA-525. DO NOT attempt to remove the top cover. Take

care to replace all screws tightly. This will provide optimum shielding of the unit from ambient radio

frequency noise or interference.

The TIA-525 is also supplied with a universal power supply that operates from 90 to 240 VAC, 50-60

Hz. Each unit is equipped with four interchangeable power plugs that equip the unit for use in North

America, Europe, the UK or Australia. Plugging the power supply into the unit disconnects the internal

battery.

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

3

Operating Considerations

The TIA-500 is comprised of a ﬁber coupled detector and two ampliﬁer stages. The ﬁrst ampliﬁer is a

transimpedance stage which converts the detector output current to a voltage by passing it through a

resistor of 1 400 or 14000 ohms. Additional ampliﬁcation is optionally provided by the second stage

which also serves to provide 50 ohm drive capability. Either AC or DC coupling between the stages

may be selected.

The overall bandwidth of the unit is determined by the ﬁrst stage transimpedance. It is in excess of

125 MHz when the TR switch is in the 1.4 K position and is 35 MHz in the 14 K position. The overall

responsivity of the unit in terms of Volts/Watt is the current responsivity of the detector multiplied by

the transimpedance and further multiplied by the second stage gain. For example, the sensitivity of

the unit at a wavelength of 1300 nm would be 0.7 A/W x 1400 V/A x 10 = 10, 000V/W. It is evident

that the same responsivity may be obtained by using a transimpedance of 14 K and a second stage

gain of one. However, the ﬁrst setting will provide a bandwidth of 125 MHz while the second will pro-

vide a bandwidth of 35 Mhz. Since the overall peak-to-peak output noise increases with bandwidth,

it is desirable to use the higher transimpedance setting assuming that the signal of interest does not

exceed 35 MHz.

The selection of AC interstage coupling is useful when the user needs to examine a small signal in

the presence of a large DC optical component, (e.g. Baseband ﬁber optic video). This will preclude

the last stage from saturating on the DC component. Otherwise, DC coupling should be employed.

When using the TIA-525 mounted on an oscilloscope, the scope may have its input set to either 50 or

1 Meg ohm input impedance. If driving a coaxial cable, the cable should have a 50 ohm characteristic

impedance and be terminated with a 50 ohm load. Note that the signal amplitude will be reduced by a

factor of two.

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

The following table summarizes the operation of the unit under various operating conditions.

Operating Considerations

continued

Spectral Response

The approximate relative response curves of the detectors employed is as shown below. Note that

these are representative curves and do not necessarily correspond to the exact response of the par-

ticular detector in use.

The approximate power at the detector surface is given by:

Peak output voltage (no load)

0.55 A/W x T Rx % Relative response from graph/100

Peak output voltage (no load)

0.8 A/W x T Rx % Relative response from graph/100

Input power in watts (InGaAs) =

Input power in watts (Si) =

Setting

Signal TRAC/DC Coupling 2nd Stage

Small Signal on large DC Components 1.4K AC X1, X10 As Needed

High Frequency signal, >35 MHz 1.4K DC X1, X10 As Needed

Low Level Signal<35 MHz 14K DC X1, X10 As Needed

Low Level, High Frequency Signal 1.4K DC X10

4

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

Typical Waveforms

Optical Input Output; TR= 14 K, Gain = 1

5

Optical Input Output; TR= 1.4 K, Gain = 10

Optical Input Output; TR= 1.4 K, Gain = 1

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

Specifications

Detector Type Silicon or InGaAs (TIA-525S, TIA-525I respectively)

Analog Signal Bandwidth (-3 dB) DC to 125 MHz (Tr = 1.4 K), DC to 35 MHz (Tr = 14 K)

Selectable Transimpedance settings 1.4 K Ohms, 14 K Ohms

Second Stage Gain Selections X 1 or X 10

Maximum Linear Input Power 1.2 mW

Maximum Input power without damage 10 mW

Spectral Response Silicon: 400 to 1000 nm, InGaAs: 850 - 1700 nm

Output Impedance 50 Ohms

Output Connector Male BNC

Fiber Optic Connector Specify FC, ST or Free-Space

Input Numerical Aperture 0.29

Inter-stage Coupling DC or AC (100 Hz Low Frequency Cutoff)

Output Offset Voltage +/- 0.1 Volt

Noise Level 3.0 pW/ root-Hz at peak responsivity

Maximum Output Voltage 4 V pk-pk, no load, 2 V pk-pk with 50 Ohm Load

Power Requirements Power Requirements 9 V Lithium Battery or supplied universal wall-mount power supply

Battery Life Approximately 30 hours, (no load)

Wall-mount Supply Power Requirements 95-260VAC, 50 - 60 Hz, 16 VA Max.

Mains Connectors Supplied North America, British, Continental Europe, Australian

Dimensions ( mm ) 63 L x 30.5 W x 32 H

Weight 5.6 oz (0.16 Kg)

LED Annunciators Provided Power On

Operating Temperature Range 0 - 40 C

Standard Warranty Two Years, Component and Workmanship, 30 day Satisfaction Guarantee

Accessories Supplied Transit Case, Universal Power Supply, 9 V ULTRALIFE Lithium Battery, Manual on CD

6

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

7

REPAIR INFORMATION

Products manufactured by Terahertz Technologies Inc. are designed and fabricated to provide reliable performance. However, in the

event that service is required, both telephone technical assistance and factory repair services are available. Call (315) 736-3642 for

information.

For IN-WARRANTY REPAIRS, call us to obtain a Returned Material Authorization number, (RMA Number). All products are to be

returned to TTI with freight charges pre-paid. Those products sent under warranty will be returned to our customers pre-paid. We can-

not be responsible for returned products that do not reference the TTI RMAnumber.

For OUT-OF-WARRANTY repairs, services are billable for both time and materials.

Calibration - This is a qualitative measurement device. No calibration is required or necessary.

LIMITED WARRANTY

TERAHERTZ TECHNOLOGIES INC. ( TTI ) WARRANTS THAT TO THE FIRST PURCHASER, FOR A PERIOD OF

TWO YEARS FROM THE DATE OF RECEIPT, THAT THIS PRODUCT (THE PRODUCT) WILL BE FREE FROM DE-

FECTS IN MATERIALS AND MANUFACTURING. THE FOREGOING WARRANTY IS THE ONLY WARRANTY, EX-

PRESS OR IMPLIED, GIVEN BY TTI, I.E., THERE IS NO WARRANTY OF FITNESS FOR A PARTICULAR PURPOSE.

TTI HEREBY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OTHER THAN THE WARRANTY IN THE FIRST

SENTENCE TO THE FULLEST EXTENT PERMITTED BY LAW.

THE SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY IS REPAIR OR REPLACEMENT AT TTI’S OP-

TION OF ANY PRODUCT THAT PROVES TO BE DEFECTIVE IN MATERIALS OR MANUFACTURING WITHIN TWO

YEARS OF RECEIPT OF THE PRODUCT. NOTE: THIS WARRANTY DOES NOT APPLY TO ANY PRODUCT WHICH

HAS BEEN SUBJECT TO MISHANDLING, MISUSE, OR SERVICE BY UNAUTHORIZED PERSONNEL OR TO ANY

PRODUCT WHICH HAS BEEN DAMAGED, MODIFIED, ALTERED OR TAMPERED WITH. TO THE FULLEST EXTENT

OF THE LAW, TTI DISCLAIMS ALL LIABILITY FOR ANY OTHER DIRECT, INCIDENTAL OR CONSEQUENTIAL

DAMAGES ALLEGED TO BE CAUSED BY A DEFECTIVE PRODUCT, I.E., TTI WILL NOT BE RESPONSIBLE FOR

ANY PERSONAL INJURY, PROPERTY DAMAGE OTHER THAN THE COST OF REPLACING THE PRODUCT OR

ANY OTHER MONETARY DAMAGE SUCH AS LOST WAGES OR PROFITS CAUSED BY ANY USE, ATTEMPTED

USE OR INABILITY TO USE THE PRODUCT. NOTE: BY USING THE PRODUCT, YOU AGREE THAT REPAIR OR

REPLACEMENT AT TTI’S OPTION WILL FULLY SATISFY TTI’S WARRANTY OBLIGATION TO YOU, WHETHER IN

CONTRACT, TORT, NEGLIGENCE, STRICT LIABILITY OR OTHER APPLICABLE LAW.

Warranty And Repair Information

苏州波弗光电科技有限公司苏州波弗光电科技有限公司苏州波弗光电科技有限公司

网址：www.bonphot.com

邮箱：[email protected]

电话：0512-62828421

TTI TIA-525 User manual

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