N4373C datasheet(4/18 Pages) HP

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Integrated optical power meter

In applications where optical power dependence character-

ization is needed, the average power meter can be used to

set the exact average output power of the LCA transmitter

by connecting the LCA optical transmitter output, optionally

through an optical attenuator, to the LCA optical receiver in-

put. By adjusting the transmitter output power in the LCA

user interface or the optical attenuation, the desired trans-

mitter optical power can be set.

In cases where an unexpectedly low responsivity is mea-

sured from the device under test, it is very helpful to get a

fast indication of the CW optical power that is launched into

the LCA receiver. The cause might be a bad connection or a

bent ﬁber in the setup. For this reason too, a measurement

of the average optical power at the LCA receiver is very help-

ful for fast debugging of the test setup.

Selectable output power of the transmitter

Most PIN diodes and receiver optical subassemblies need to

be characterized at various average optical power levels. In

this case it is necessary to set the average input power of

the device under test to the desired value. The variable aver-

age optical output power of the LCA transmitter offers this

feature. Together with an external optical attenuator, this

range can be extended to all desired optical power levels.

Group delay and length measurements

In some applications it is necessary to determine the elec-

trical or optical length of a device. With the internal length

calibration of the electro-optical paths with reference to the

electrical and optical inputs or outputs, it is possible to de-

termine the length of the device under test

External optical source input

For applications where test of opto-electric devices need to

be done at a speciﬁc optical wavelength like proposed in

the IEEE 802.3ba standard, the N4373C-050 option offers an

external optical input to the internal modulator where an ex-

ternal tunable laser can be applied. As modulators are polar-

ization sensitive devices, this input is a PMF input to a PMF

optical switch to maintain the polarization at the internal

modulator and keep loss at a minimum.

This external optical source input is required when O/E

devices with integrated ﬁlter are to be characterized, or

generaly when the O/E converter needs to be tested at dif-

ferent wavelengths than the internal source.

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