Table of Contents
Advertisement
Definition of Terms
Agilent 81650A/1A/2A/4A/5A/6A/7A User's Guide, Third Edition
Definition of Terms
This section defines terms that are used both in this chapter and
"Performance Tests" on page 31.
Generally, all specifications apply for the given environmental
conditions and after warmup time.
Measurement principles are indicated. Alternative measurement
principles of equal value are also acceptable.
Center wavelength
The center wavelength is defined as the spectral center of gravity. For
a Fabry-Perot type laser source with discrete longitudinal modes, this
definition can be expressed as:
λ
where:
P
=power levels of the individual longitudinal lines
i
λ
=wavelengths of the individual longitudinal lines
i
Spectral width
The spectral width of an optical source is defined as the source's full-
width half-maximum (FWHM) spectral width, ∆λ
continuous spectrum, e.g., the spectrum of a Fabry-Perot type laser
diode, the spectral width is defined as the FWHM of the spectral
envelope, to be calculated from the RMS spectral width, ∆λ
λ
∆
506
λ
∆
):+0
and
where:λ
=center wavelength of laser diode in vacuum
center
P
=Σ P
= total power, in watts
total
i
∑
λ
3
L
L
=
&
∑
3
L
λ
Σ
3
2
L
L
=
3
WRWDO
λ
∆
0
=
506
Specifications
. For a non-
FWHM
:
RMS
1 2
/
λ
2
-
FHQWHU
23
Advertisement
Table of Contents
