22
Chapter 5. PID locking
5.1
Using with
MOGL
abs
DLC
laser controller
If
using
the
FZW
with
a
MOGL
abs
laser
and
DLC
controller,
con-
nect
the
FZW
SMA
output
to
the
DLC
SWEEP
input
and
set
DIP
9
on (external piezo stack control); see figure below.
Set the offset to
1.25 V. Use the
DLC SPAN
knob as a master gain on the
PID
feedback.
The
SCAN/LOCK
and fast lock should be off (up); only slow (piezo)
feedback will be active through the
SWEEP
control.
+9-30V
PID
TRIG
FSW
FZW
T
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a
g
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x
a
m
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p
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d
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o
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ai
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/
R
O
R
R
E
D
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M
R
R
U
C
/
P
E
E
W
S
D
O
M
T
Z
P
S
T
U
P
N
I
T
X
E
B
L
E
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N
A
H
C
A
L
E
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N
A
H
C
ai
la
rt
s
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A
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d
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P
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A
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k
c
ol
r
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t
n
I
DLC Diode Laser Controller
Figure 5.1:
Stabilising a laser frequency with the
FZW
and
PID
. The
SMA
output of the
FZW
should be connected to the SWEEP/PZT input on the
rear of the MOGLabs
DLC
controller.
5.2
PID parameters
The
PID
feedback signal is calculated on the device, but the param-
eters are most easily controlled using
mogfzw
while watching a plot
of the wavelength against time using the time-series window.
Setpoint
λ
0
Defines the reference wavelength
λ
0
, for the the currently active
measurement
wavelength units set in the main
mogfzw
window
or on the device.
Gain (V/GHz)
Defines the gain,
G
in volts per GHz.
The value should be ap-
Summary of Contents for FSW4
Page 1: ...Fizeau Wavemeter and Fibre Switcher FZW600 FSM2 FSW4 FSW8 Firmware v0 9 5 mogfzw v1 4 5 ...
Page 36: ...30 Chapter 5 PID locking ...
Page 50: ...44 Appendix A Specifications ...
Page 60: ...54 Appendix C Command language ...
Page 62: ...56 Appendix D Errors and troubleshooting ...
Page 67: ...F Dimensions and PCB 83 120 146 32 9 30V PID TRIG FSW Figure F 1 FZW chassis dimensions 61 ...
Page 68: ...62 Appendix F Dimensions and PCB 146 33 37 120 18 Figure F 2 FSW fibre switch dimensions ...
Page 71: ......