Coherent Modulation Transmitter | IQTX
Quantifi Photonics Ltd.
Version
1.04
17
Setting up IQTX for dual polarization
IQTX models enable to generate dual polarization signals where the optical signal can be transmitted
along two orthogonal polar planes in the optical fiber. However, the IQTX 1100 Series will only duplicate
and delay modulated signals along both polarizations.
optical fiber
•
Ensure that the IQTX is ON before applying any RF signals to the RF signal inputs.
•
Ensure the input RF signal voltage remains below the specified 500 mV pk-pk.
•
For advice on connector care, refer section 4 Working with electrical connectors
6.3.1
IQTX 1100 Series (Emulated Dual Polarization)
To generate a dual polarization signal:
Follow the instructions in section
Setting up IQTX for single polarization (IQTX 1100 Series models only) establish a single polarization
modulation signal.
1.
Connect the Single Polarization SIGNAL OUT to the Dual Polarization SIGNAL IN using a PMF
patch-cord, to generate the Y-pol modulation signal.
2.
The dual polarization modulated signal generated from the input RF pattern is then output from
the optical port labelled Dual Polarization SIGNAL OUT.
6.3.2
IQTX 1200 Series (Full Dual Polarization)
The IQTX 1200 Series instrument can generate optical signals from up to four independent RF channel
sources. One channel pair from the RF input signals is modulated on the X-pol, the second pair is
modulated on the Y-pol.
To generate a dual polarization signal:
1.
Connect the data channels from the RF source to the RF Signal Inputs IN-PHASE electrical and RF
Signal Inputs QUADRATURE connectors.
2.
Connect the internal Laser output to the Modulator Input. If using your own narrow-linewidth Laser,
the linewidth needs to be less than 500kHz.
Please make sure the Laser power connected to the modulator input does not exceed the
maximum optical power specification.
3.
The dual polarization modulated signal is output from the modulator output port.