Using An External Source; Using The Ola As A Polarization Controller - Agilent Technologies HP E5574A User Manual

You can perform all
measurements with an
external laser source
except the measurement of
Return Loss.
WARNI NG
6.2
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Using the OLA as a Laser Source and Polarization Controller

Using the OLA as a Polarization Controller

Using an External Source

You can connect an external LED, laser, or white light source to the
optical input of the OLA. The built-in optical coupler will direct the
external light to the OLA's optical output. It is attenuated by
approximately 3 dB.
If you wish to use an external source, you must turn the internal
source off by pressing S
at the front panel must not be lit.
Although the source indicator lamp is off, light (eventually laser light)
will emerge from the optical output! This happens even if the OLA is
not connected to the mains or is switched off!
Using the OLA as a Polarization
Controller
The OLA comprises a 4-paddle polarization controller. Four fiber
loops have been optimized to approximate four quarter-wave
retarders over the polarization controller's specified wavelength
range. Each paddle (loop) can rotate between 0 and 180°.
You can use the polarization controller
• to sweep through all states of polarization, or
• to set a reproducible state of polarization.
You can change the polarization of the internal source or an
external polarized laser source as well.
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O /O . The source indicator lamp
OURCE N FF