3-16
IM AQ6370D-01EN
5.
If you press the
CANCEL
soft key while the alignment adjustment is in progress,
it will be canceled.
Note
• It will take approximately 2 minutes for the alignment adjustment to complete.
• After alignment is executed, the AQ6370D does not automatically perform internal
wavelength calibration. Perform wavelength calibration according to the instructions in
“Wavelength Calibration Using an External Light Source” in section 3.7, “Wavelength
Calibration.”
• If you cancel alignment adjustment, it will be invalid. The AQ6370D will be in the same
condition as it was before alignment adjustment was executed.
Explanation
Types of Optical Fibers
The instrument can use single mode optical fibers with core diameters of 5 to 9.5 μm,
and multimode (GI) optical fibers with core diameters of 50 and 62.5 μm. Functions may
be limited or restricted depending on which type of optical fiber is used. The table below
shows which of the typical types of fiber may be used and the limitations on their use.
Limitations on Wavelength Resolution
The maximum wavelength resolution for the instrument is 0.020 nm, which is only
obtainable when using a single-mode optical fiber with a core diameter of 9.5
μ
m or less.
As shown in Table, the maximum wavelength resolution decreases when optical fibers
with thicker core diameters are used.
Setting a resolution value finer than those shown in the table below will simply result in
an inaccurate measurement level without improving resolution.
Optical fibers with a thick core diameter are especially useful for inputting spatial light for
measurement, but they have poor resolution.
Choose the best type of optical fiber for your particular application.
Note that the instrument is designed for input through optical fiber only. It will not work
with inputs that do not pass through optical fiber, such as direct input of a gas laser
beam to the optical input connector, or bonding an LED to the optical input connector. It
is important to note that optical spectrum measurements taken through such inputs are
completely unreliable.
For spatial light measurements, input the spatial light to the optical fiber and from the
optical fiber to the instrument. A variety of adapters are available for this purpose.
3.6 Alignment Adjustment
