For an arbitrary input polarization state, the polarization monitor measures the output
polarization state and then sends a feedback signal to the polarization controller. The
optimization process is repeated until the desired output SOP is achieved.
The POS-002 can also be factory configured to use external feedback control. In this
case, the feedback signal is a DC or quasi-DC voltage generated by the user. This
feedback signal can correspond to any parameter that is to be optimized by the
polarization controller, such as digital clock level, optical extinction ratio, clear eye
pattern area, receiver power level, local oscillator level, interferometer fringe contrast,
SOP, etc. In this configuration, the polarization monitor unit (composed of the
components in the dashed line box shown in Figure 2) is not installed. In this case, the
optical path of the entire module is a continuous section of optical fiber. Therefore, the
optical insertion loss from the polarization controller can be disregarded.
Figure 2 POS-002 polarization tracker block diagram.
Standard model with internal optical feedback
Document #: GP-UM-POS-002-21
Page 7 of 30
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