TTI TIA-952 User manual

TIA-952

Optical/Electrical Converter

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

2/2012

Operating Instructions

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

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

Powering the Unit ........................................................................................................... 2

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

Operating Considerations............................................................................................... 3

Spectral Response ........................................................................................................ .3

Speciﬁcations ................................................................................................................. 4

Limited Warranty ............................................................................................................ 5

Repair Information.......................................................................................................... 5

Contents

Introduction

The TIA-952 Optical to Electrical Converter is a convenient ﬁber optic detector/ampliﬁer combination

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

width of 800 MHz, it accurately provides an electrical replica of the optical signal presented to it. It is

fully capable of driving a 50 ohm cable terminated in its characteristic load.

The InGaAs version of the TIA-952 has a transimpedance of 500 Ωplus a post ampliﬁer with select-

able gains of 1 or 5. Thus the overall responsivity ranges from approximately 450 V/W to 2250 V/W

at the peak of the detector response curve and when terminated in a 50 ohm load.

The Silicon version of the TIA-952 has a transimpedance of 250 Ωplus a post ampliﬁer with select-

able gains of 1 or 5. Thus the overall responsivity ranges from approximately 225 V/W to 1125V/W

at the peak of the detector response curve and when terminated in a 50 ohm load.

The unit is powered by a universal wall mount power supply. The supply accepts mains voltages

from 95 to 260 V.A.C., 47-60 Hz. Four mains plugs are provided that are compatible with standards

used in North America, Great Britain, Continental Europe and Australia.

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.

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

Powering the Unit

The TIA-952 is equipped with a universal 12 volt regulated power supply that operates from 95 to

260 VAC, 47-60 Hz. Each unit is supplied with four interchangeable power plugs that equip the unit

for use in North America, Europe, Great Britain or Australia. Simply snap on the appropriate mains

connector and plug the 2.1 mm coaxial plug into the receptacle located just under the optical input

connector. Then plug the power supply into a power outlet. Sliding the unit’s power switch to the On

position should result in the green power-on indicator LED turning on.

Controls

Applies power

to the unit

Selects gain of

second stage

Operating Considerations

The TIA-952 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 500 ohms. Additional ampliﬁcation is optionally provided by the second stage which also

serves to provide 50 ohm drive capability. The ampliﬁers are AC coupled.

The overall bandwidth of the unit is determined by the second stage gain setting. The bandwidth is in

excess of 800 MHz when the second stage is set for a gain of 1 and 300 MHz when it is set to a gain

of 5. The overall responsivity of the unit in terms of Volts/Watt is the current responsivity of the detec-

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

the sensitivity of the unit at a wavelength of 1550 nm would be 0.9 A/W x 500 V/A x 5 = 2,250 V/W.

When using the TIA-952 mounted on an oscilloscope, the scope should have its input impedance set

to 50 ohms. If driving a coaxial cable, the cable should have a 50 ohm characteristic impedance and

be terminated with a 50 ohm load.

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:

TIA 952 InGaAs Detector TIA 952 Silicon Detector

Input power in watts (InGaAs)

Input power in watts (Si)

Peak output voltage (no load)

0.55 A/W x TRx % Relative response from graph/100

Peak output voltage (no load)

0.8 A/W x TRx % Relative response from graph/100

TIA-952 Specifications

Detector Type Large area InGaAs

Analog Signal Bandwidth (-3 dB) 30 KHz to 800 MHz, Low gain, 30 KHz to 300 MHz High Gain

Selectable Responsivity Settings 500 V/W or 2500 V/W @ 1550 nm when terminated in a 50 Ohm Load

Maximum Linear Input Power 2 mW

Maximum Input Power Without Damage 15 mW

Spectral Response InGaAs: 850 - 1700 nm

Output Impedance 50 Ohms

Output Connector Male BNC

Fiber Optic Connector Specify FC or ST

Input Numerical Aperture 0.29

Input fiber Accommodated 9um Single mode or 50/125 & 62.5/125um multi-mode

Output Offset Voltage N/A Volts

Noise Level 9.5 pW/ root-Hz at peak responsivity

Maximum Output Voltage Low gain, 2.0 V pk-pk, High Gain 4 V pk-pk, (Into 50 Ohms)

Power Requirements Supplied wall-mount universal power supply

Wall-mount Supply Power Requirements 90-260VAC, 50 - 60 Hz, 16 VA Max.

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

Dimensions ( mm ) 30.5 W x 63 L x 33 H

Weight (0.16 Kg)

LED Annunciators Provided Power On

Operating Temperature Range 0 - 40 C

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

Accessories Supplied Transit Case, Universal Power Supply, Manual on CD

TTI reserves the right to change speciﬁcations without notice.

Warranty And Repair Information

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 cannot be responsible for returned

products that do not reference the TTI RMA number.

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.

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