Santec ECL-200 User manual

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ECL-200 Quick Start Guide
Warning!
This device contains a semiconductor laser and is intended
for operation by persons familiar with this type
of
equipment. The beam is not visible to the naked eye, but
if it comes into contact with your eyes it may cause
permanent damage to your eyesight. Under no circumstances
look directly into the optical output connector on the
instrument
santec's
ECL-200 is a multi-channel tunable light source. It provides a wide
tuning range, with high output power and long term wavelength and power
stability. Its operation is relatively simple, but to ensure optimum
performance some care is requiredduringset-up. This document provides
a summary of the setting procedure.
Switching ON
Check the voltage setting on the rear panel of the instrument
and adjust if necessary. In Europe
this is usually 230V.
Plug in the main power lead.
Check that each ECL-ZOO unit is firmly installed in the MLS-8000
rack.
Insert the key into the key-lock on the MLS-8000 rack and turn
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the unit on. The LED indicatorson each ECL-200unit should light
momentarily.
Let the unit warm up. The unit can usually be used after
10-15
minutes, but it is usually best to allow 30 minutes, especially
if the unit has just come off a cold delivery truck!
Switching OFF
Before turning the power OFF on the MLS-2000/8000 it is
important to ensure that the LD on each ECL-200module is turned
off. The LED indicator above each LD button should NOT be lit.
The LD button turns the current
to the laser diode on and off .
The LED will light up when the current is on.
It can take several
seconds after pressing the LD button before the current drops
to zero and the LED goes out.
1. Fixing Screw
1
2. Wavelength Setting Dial
3. Store Settings Button
2 4. LD, PD, Temp, Fine Mode
3
Indicators
4
5. Numeric Display
5
6. Up / Down Keys
7. ACC /APC Mode Selector
14 6 8. ACC Mode Indicator
13 8 9. APC Mode Indicator
12 7
9
10. LF or RF Input (Option)
11 10 11. Optical Output Connector
12.
LD ON/OFF Key
13. LD ON Indicator
Setting the Wavelength and Power
Settingawavelengthis simplebuttoobtaina stable singlemodeoutput,
adjustment of both wavelength tuning elements present in the laser's
optical cavity is required.
Thediagrambelowshowsthetuningprinciple
of the laser.
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A temperature controlled Grid Filter provides fine wavelength tuning.
This filter has transmission peaks with period 0.8nm and is adjusted
electronically using the FINE control. The transmission peak closest
to the required wavelength is selected using the Dielectric Filter.
This is adjusted using the Wavelength Setting Dial
(2). The correct
procedure to set both the wavelength and power is:
1.
InACC mode set the wavelength to within 0.4nm with the Dielectric
Filter.
2. Adjust the FINE function to adjust the Grid Filter to the required
wavelength.
3. Adjust the Dielectric Filter to maximize the output power.
4. Set to APC mode and adjust the output power to the required value.
Wavelength Setting in Detail
To set the wavelength a Wavelength Meter or Optical Spectrum Analyser
(OSA) is required.
Switch the unit on using the key as described above.
Press the LD button to inject current to the LD. The LED will
light above the LD button.
Check that ACC mode is selected. The LED above ACC should be
lit. If not, press the ACC/APC Mode Selector to toggle from APC
mode.
Rotate the Wavelength Setting Dial so that the display on your
OSA or wavelength meter is within k0.4nm of the target
wavelength.
Enter the fine tuning mode by pressing the SELECT Key until the
FINE indicator is lit. The light will blink for a few seconds
indicating that the FINE tuning value can be adjusted. when
the
FINE LEDis blinkingthe Numeric Displaywill show the target
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value for FINE tuning. After a few seconds, the LED will
stop
blinking. The Numeric Display will then show the actual value
for the FINE tuning and it will no longer be possible to adjust
the setting. To re-enable setting (and start the
LED blinking)
press the SELECT Key once. When the LED is blinking use the
UP
and DOWN Keys to adjust the FINE tuning value. Be aware that
FINE tuning adjusts the temperature of the Grid Filter and it
takes a few moments (10 to 20 seconds) to stabilize after each
adjustment. You will soon become accustomed to this.
Press the SELECT Key until the PD.lm indicator is lit. Very
carefully adjust the Wavelength setting Dial by a small amount
to maximize the value shown on the Numeric Display. This
procedure centres the Dielectric Filter on the Grid Filter peak.
When the two filters are aligned maximum output power is
observed.
Setting the Output Power in Detail
With the wavelength set, you may now set the power to a fixed output
power if desired. The Automatic Power Control (APC) mode will ensure
this power is constantly maintained.
Select the APC mode by pressing the ACC/APC Mode Selector. The
APC indicator should light.
Select the PD.lm mode by pressing the SELECT Keys until the PD. lm
indicator is lit. Monitor the output power on a power meter and
press the
UP / DOWN Keys to set the output power.
Coherence Control
The ECL-200 has a linewidth of typically 15OkHz. In many applications
the narrow linewidth is an advantage, but in some applications such as
sensors,where there are reflections in the fibre connected tothe laser,
a broader linewidth is advantageous. The ECL-200 has a coherence
control function which adjusts the linewidth of the laser.
Coherence Control function is activated (and deactivated) by
pressing and holding the SELECT Key for
3 seconds.
A beep will
be heard and when the function toggles. The LD
ON/OFF Indicator
LED will blink when the Coherence Control function
is active.
For further information, refer to Section
9 of the operation
Manual.
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Oh No ... It's Not Stable!
Now, is the unit stable? Does it have a single mode oscillation?
On rare occasions
it will not be possible to achieve single mode
operation on the first attempt. On an
OSA multiple peaks will
be seen; with a wavelengthmeter a stablewavelength readingwill
not be achieved. The most likely cause
is that the Dielectric
Filter has not been adjusted correctly. However, if the
procedure above has been followed and single mode operation has
not been achieved,
it is necessary to adjust the LD temperature
by a small amount. Usually, a 0.5OC adjustment
will solve the
problem. Toadjust the LDtemperature, PresstheSELECTKeyuntil
the
TEMP light is blinking. Use the UP or DOWN Keys as necessary
toadjust the displayed value by 0.5. The initial readout should
be 25.0 (25.0°C). Allow 10-15 minutes for the
LD temperature
to stabilize and then repeat the wavelength and power setting
procedure.
Remember, with Santec's ECL-200 every wavelength (to within
0.012nm) can be set, anda stablemode hop freeoutputobtained.
Saving the Settings
The settings on each ECL-200 module can be stored sothat theunit always
starts at exactly the same wavelength and power, with the coherence
control and
ACC/APC settings preset. To save the settings:
Press the STORE button with a pen. The unit will beep when
pressed.
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