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Features
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Bandwidth: 30 KHz to 7 GHz, typical |
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Wavelength response: 950 to 1650 nm |
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Low noise, high gain |
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Gain settings from 2 to 7 |
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SMA type K output electrical connector |
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FC/APC style fibre optic input connector |
The TIA-4000 is comprised of a fibre coupled InGaAs APD
detector combined with a variable reverse bias voltage network and fast
transimpedance amplifier. The output of the unit 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 transimpedance 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-4000 is 30 microns in
diameter. It is coupled to a single mode optical fibre. Typical optical return
loss is 52dB and is caused primarily by the FC/APC connector employed.
 The applied bias voltage
controls the gain of the APD. This voltage, in turn, is controlled by means of
the two push buttons on the top panel. The rightmost button increases the gain
and the leftmost button decreases the gain. There are 64 discrete gain settings
that are retained in non-volatile memory when the power is turned off. Thus the
gain setting will be retained even though power is disconnected from the
unit.
Pressing a button once causes the unit to advance in
the selected direction by one step. Holding the button down causes the unit to
advance automatically until a limit is reached.
Specifications
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Detector type: InGaAs/InP APD (950-1650 nm) Gain 2 -
7 |
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Transimpedance gain: 500 ohms |
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Max. linear input power: 1 mW |
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Input without damage: 5 mW, +3dBm |
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Bandwidth: 30 KHz to 7 GHz typical |
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Sensitivity: -25dBm @ 10-12BER, 2-31-1
PRBS |
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Output impedance: terminate in 50 ohms |
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Output connector: type K SMA female |
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Fibre optic input connector: FC-APC or FC-PC |
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Power required: 120/240 VAC, 50-60 Hz |
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Dimensions: 102 (L) x 63 (W) x 31 (H) mm |
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Weight: 150 gm |
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Operating temperature: 0 - 40 C |
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Limited warranty: 2 years from date of receipt |
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