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P6701B and P6703B Performance Verification
10
P6701B, P6703B, and P6723 Service Manual
1. Connect 1310 nm laser to attenuator.
NOTE. The longer wavelengths of 1310 nm and especially 1550 nm are more
sensitive to loss in fiber due to bending of the fiber than the short wavelength.
The fiber bend radius of the P670XB fiber input should lay with >1-inch bend
radius along the fiber’s entire length. Although this precaution must be
maintained throughout the entire PV procedure, it is especially important for this
step in order to accurately adjust and measure DC-conversion gain of the
P670XB.
2. Connect FC connector of the optical attenuator to the FC receptacle of the
optical power meter using optical cable; use the appropriate optical power
meter sensing head with calibrated measurement for a wavelength span
including 1310 nm and 1550 nm. Be sure the optical power meter wave-
length setting is at 1310 nm.
3. Adjust the attenuator or optical source so that the power meter reads 100 W.
4. Move the FC fiber end (the one now adjusted to 100 W average power)
from the optical power meter and connect to the P670XB input under test by
using the FC-FC inline female-female optical adapter.
5. Attach voltmeter with 50 ohm termination to 1103 powered P670XB output.
6. Check for 100 mV reading on voltmeter, ± 8%. (The 1310 nm Conversion
Gain is 1.00 V/mW.)
AC Conversion Gain
1. Connect the probe under test to the 11K series oscilloscope and to the cal
source.
H If the unit under test is a P6701B, connect the 850 nm modulated laser
source to the optical attenuator input. Connect the output of the optical
attenuator to the P6701B input via an inline adapter.
H If the unit under test is a P6703B, connect the 1310 nm modulated laser
source to the optical attenuator input. Connect the output of the optical
attenuator to the P6703B input via an inline adapter.
2. Adjust the laser cal source to provide a 10KHz to 20KHz optical square
wave on the scope. Adjust the optical attenuator so that the total peak-to-
peak signal from the P670XB is about 200 mV (or 200 W if the vertical
units displayed are “W”).
P6703B