Agilent Technologies 81642A Stud Sensor User Manual


 
Specifications Definition of Terms
42 Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules Users Guide,
Sixth Edition
Measurement with heterodyning technique: the output of the laser
under test is mixed with another laser of the same type on a wide
bandwidth photodetector. The electrical noise spectrum of the
photodetector current is measured with an Agilent Lightwave Signal
Analyzer, and the linewidth is calculated from the heterodyne
spectrum (Lightwave signal analyzer settings: resolution bandwidth
1 MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).
Linewidth
The 3-dB width of the optical spectrum, expressed in Hertz.
Conditions: temperature within operating temperature range,
coherence control off, power set to maximum flat power (maximum
attainable power within given wavelength range).
Measurement with self-heterodyning technique: the output of the
laser under test is sent through a Mach-Zehnder interferometer in
which the length difference of the two arms is longer than the
coherence length of the laser. The electrical noise spectrum of the
photodetector current is measured with an Agilent Lightwave Signal
Analyzer, and the linewidth is calculated from the heterodyne
spectrum (Lightwave signal analyzer settings: resolution bandwidth 1
MHz; video bandwidth 10 kHz; sweep time 20 ms; single scan).
Minimum Output Power
The minimum output power for which the specifications apply.
Mode-Hop Free Tuning Range
The tuning range for which no abrupt wavelength change occurs
during fine wavelength stepping. Abrupt change is defined as change
of more than 25 pm.
Conditions: within specified wavelength range, at specified
temperature range and output power. Tuning from outside into the
mode-hop free tuning range is not allowed.
Modulation Extinction Ratio
The ratio of total power in on-state to total power in off-state,
expressed in dB.
Conditions: Internal or external modulation, tunable laser at highest
power setting.