Anritsu Company VectorStar ME7848A-0171 Посібник із швидкого старту - Сторінка 8
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3. System Check
5. For the ME7848A-0240:
a. Configure the MN4775A-0040 E/O Converter:
i. Turn the laser on.
ii. Set modulator bias to quadrature and dither.
A. Initiate a bias calibration.
iii.Set VOA (variable optical amplifier) to constant power output and -3 dBm.
6. For the ME7848A-0270:
a. Configure the MN4775A-0070 E/O Converter.
i. Turn the laser on.
A. Adjust the wavelength to 1550 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 +5 dBm.
7. For the ME7848A-0271:
a. Configure the MN4775A-0071 E/O Converter:
i. Turn the laser on.
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.
8. For the ME7848A-0272:
a. Configure the MN4775A-0072 E/O Converter for 1550 nm operation:
i. Turn the laser on.
A. Set the wavelength to 1550 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 +4 dBm.
iv. Observe the response described in Step 9.
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.
9. 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
10 dB of roll-off to 70 GHz for the -027x systems or 12 dB of roll-off to 40 GHz with the -0240 systems).
QSG-8
PN: 10410-00777 Rev. B
ME7848A QSG