Document #: GP-UM-POD-001-13
Page 8 of 8
output end of the device (actual output power) in mW. The input optical power
P
in
of the
device in dB is:
P
in
(
dB
)
=
S
o
(
dB
)
+
IL
(3)
where IL is the insertion loss of the device, which is provided in the data sheet of every
PolaDetect unit.
In general, the calibration matrix is wavelength dependent. Each matrix is sufficiently
accurate for wavelengths /- 5 nm of the specified wavelength. General Photonics
provides 5 matrices, at 1520 nm, 1530 nm, 1540 nm, 1550 nm, and 1560 nm,
respectively, for C-band operation. The file name for each matrix is
Matrix_xxxxnm_xxx-x-xxx.xls, where xxxxnm is the wavelength band of the device and
xxx-x-xxx.xls is the series number.
4.2 Comparing the results with a polarization measurement instrument
To verify the performance of General Photonics’ PolaDetect against a reference
polarization instrument, the setup shown in Fig. 3 may be used. However, coordinate
alignment procedures must be performed before the measurement, because the output
fiber of the PolaDetect has some residual birefringence which causes the SOP to change.
Contact General Photonics for details.
