Document #: GP-UM-POD-001-13
Page 5 of 8
3.1 Optical interface
1.
The optical module has two fiber pigtails: one for the input and the other for the
output.
2.
An arrow (“
Æ
”) sign is marked on the side of the package to indicate the direction of
the input light beam.
3.
Fiber connectors can either be FC/PC or FC/APC per customer specification.
4.
Coordinate orientation is marked on the
output face
of the device. The measured
Stokes parameters are based on this coordinate system, as shown in Table I. In
addition, for the PM fiber output option, the slow axis is aligned with the 0° vertical
line.
Table I
Stokes parameter (
s
1
,
s
2
,
s
3
)
State of Polarization (SOP)
(1,0,0)
Linear SOP oriented at 45°
(-1,0,0)
Linear SOP oriented at –45°
(0,1,0)
Linear SOP oriented at 0°
(0,0,1)
Right hand circular SOP
3.2 Electrical interface:
Two models are available. POD-xx-xx-01 has no preamplifier circuit while POD-xx-xx-
02 does. POD-xx-xx-01 is for OEM customers who have mastered the art of polarization
analysis and will perform their own calibrations for their power detection circuits.
General Photonics will only provide the calibration for the POD-xx-xx-02 with an
integrated preamplification circuit designed and fabricated by General Photonics.
1.
For POD-xx-xx-01, there are 10 pins on the bottom side of the package. +
i
and –
i
are
the output from detector #
i
, where
i
= 1, 2, 3, 4 respectively. The last two pins are
ground.
1+ 1- 2- 2+ 3- 3+ 4- 4+ GND GND
1+ 1- 2- 2+ 3- 3+ 4- 4+ GND GND
Fig. 2a Pin locations on the electronic output connector for the POD-001 (back side view)
