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TIA-952
Optical/Electrical Converter
Terahertz Technologies Inc.169 Clear Road Oriskany NY 13424 (315) 736-3642 FAX (315) 736-4078
Operating Instructions
E-mail [email protected]
2/2012
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Contents
Introduction ..................................................................................................................... 1
Unpacking and Inspection .............................................................................................. 1
Powering the Unit ........................................................................................................... 2
Controls .......................................................................................................................... 2
Operating Considerations ............................................................................................... 3
Spectral Response ........................................................................................................ .3
Specifi cations ................................................................................................................. 4
Limited Warranty ............................................................................................................ 5
Repair Information .......................................................................................................... 5
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Introduction
The TIA-952 Optical to Electrical Converter is a convenient fi ber optic detector/amplifi er 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 Ω plus a post amplifi er 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 Ω plus a post amplifi er 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.
Calibration - This is a qualitative measurement device. No calibration is required or necessary.
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 fi ling a claim TTI should be notifi ed.
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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
Selects gain of
second stage
Applies power
to the unit
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Operating Considerations
The TIA-952 is comprised of a fi ber coupled detector and two amplifi er stages. The fi rst amplifi er is a
transimpedance stage which converts the detector output current to a voltage by passing it through a
resistor of 500 ohms. Additional amplifi cation is optionally provided by the second stage which also
serves to provide 50 ohm drive capability. The amplifi ers 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 particular detector in use.
The approximate power at the detector surface is given by:
Peak output voltage (no load)
Input power in watts (InGaAs)
Input power in watts (Si)
TIA 952 InGaAs Detector
=
=
0.8 A/W x T
0.55 A/W x T
R x % Relative response from graph/100
Peak output voltage (no load)
R x % Relative response from graph/100
TIA 952 Silicon Detector
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TIA-952 Specific ations
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 specifi cations without notice.
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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 DEFECTS IN MATERIALS AND MANUFACTURING. THE FOREGOING WARRANTY IS THE ONLY WARRANTY, EXPRESS 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 OPTION 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
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.
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