TIA-1200 Optical / Electrical Converter
Operating Instructions
Contents
Introduction.................................................................................1
Specifications..............................................................................2
Unpackaging and Inspection.......................................................3
Power Supply..............................................................................3
Setup...........................................................................................4
Operating Considerations............................................................5
Service/Warranty Information......................................................8
Introduction
The TIA-1200 Optical to Electrical Converter is a wide-band detection system for fiber optic
applications. With a typical bandwidth of DC to 14 GHz, it accurately provides an electrical
replica of the optical signal presented to it. It is intended to drive a 50 ohm cable terminated in
its characteristic impedance.
The unit is equipped with an InGaAs/InP detector that is responsive in the wavelength range of
900 - 1700 nm. The TIA-1200 is provided with an FC fiber optic receptacle. Other fiber optic
connectors can be provided on request. The output signal is presented to a type K SMA female
connector.
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Specifications
Detector Type ............................................................... InGaAs/InP(900-1700nm)
Current responsivity...................................................... 0.7 A/W @1300 nm, 0.8 A/W @ 1550nm
Maximum Linear Input Power...................................... 3 mw
Input Without Damage.................................................. 10 mw
Bandwidth (-3dB)......................................................... DC to 14 GHz typical, 12 GHz min.
Output Impedance......................................................... Terminate in 50 Ohms
Output Connector.......................................................... Type K SMA female
Fiber Optic Input Connector......................................... FC/UPC or FC/APC
Input Numerical Aperture............................................. 0.11
Optical Return Loss...................................................... 35 dB, >52 dB with APC connector
Power Required............................................................ 120/240 VAC, 50-60Hz
Dimensions................................................................... 1.2” W, 2.5” L, 1.5” H, (30.5 mm, 63
mm, 38 mm)
Weight .......................................................................... 5.6 oz, 158 g
Operating Temperature................................................. 0 - 40 C
Limited Warranty.......................................................... 2 Years from date of receipt
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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
unpacking, 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.
Power Supply
Each unit comes equipped with a 9 V regulated power supply that provides power to the unit.
Simply plug the power supply output cable into the receptacle located beneath the FC fiber optic
connector. It is recommended that the user never attempt substitution of this unit with any
other power supply. Reverse polarity or voltages other than 9 Volts may irreparably damage
the unit. The power supply can be used with mains of either 120 or 240 VAC, 50-60 Hz. Several
replaceable power plug adaptors are supplied for use in various countries.
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Typical Setup of the TIA-1200
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Operating Considerations
The TIA-1200 is comprised of a fiber coupled InGaAs detector coupled with a reverse bias voltage network. The ouput of the diode is brought out to a type K female SMA connector. Light
falling on the detector generates a positive-going proportional current. This current, multiplied
by the load impedance produces a voltage that is proportional to the light incident on the detector
surface.
Normally the unit is used to drive a coaxial cable, this cable should have a 50 ohm characteristic
impedance and be terminated with a 50 ohm load at the oscilloscope or other measuring device
to be used.
The active area of the TIA-1200 is 50 microns in diameter. With the optional 50 micron fiber
both singlemode and multimode sources may be tested without incurring excessive coupling
losses.
Typical optical return loss is 35 dB and is caused primarily by the FC/PC connector employed.
If higher return loss is needed, The unit may be optionally equipped with singlemode angled PC
connectors for ORLs of around 52 dB..
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The bandwidth of the TIA-1200 is from DC to typically 14 GHz (-3 dB ). Refer to the following
Bode plot
Relative Power
Response
{dB}
Typical Frequency Response
Frequency {GHz}
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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 on the
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