Anritsu Company VectorStar ME7848A-0240 Panduan Memulai Cepat - Halaman 10
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3. System Check
b. Configure the MN4775A-0072 E/O converter for 1310 nm operation:
i. Turn the laser on.
A. Set the wavelength to 1310 nm.
ii. Set the modulator bias to quadrature and dither.
A. Initiate a bias calibration
iii.Set the VOA (variable optical amplifier) to constant power output and +2 dBm.
iv. Perform the observation described in Step 9 below.
11. Observe |S21| on the trace set up in step 1.d. The low frequency response will range from -30 dB to
-50 dB for the various models and there should be a roughly monotonic decrease with frequency (about
15 dB of roll-off to 70 GHz for the -027x systems, 18 dB of roll-off to 40 GHz with the -0240 systems, or
20 dB roll-off to 110 GHz for the -021x system).
Figure 2.
Example Plot of |S21| for the System Check on a ME7848A-0270 System at +5 and +2 dBm Optical
Power Levels. The absolute values and approximate shape are of interest.
In
Figure
2, the blue curve is at 5 dBm optical power out of the modulator which is the test condition
mentioned above. The red curve is at +2 dBm optical power for information. ME7848A-0271 systems will have
a similar curve shape but shifted lower in values than the red curve (due to lower O/E responsivity).
ME7848A-0240 systems will roll-off faster and have a shift down in values relative to the red curve (due to
lower O/E responsivity). 110 GHz systems will have curves shifted slightly lower and with similar amounts of
roll-off to 110 GHz instead of 70 GHz.
QSG-10
PN: 10410-00777 Rev. C
ME7848A/E QSG