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External Cavity Tunable LD Module
OPERATION MANUAL
ECL-200
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ECL-200 OPERATION MANUAL
Trademarks
santec is a trademark of Santec Photonics Laboratories.
OPELS is a trademark of Santec Photonics Laboratories.
ECL-200 is a trademark of Santec Photonics Laboratories.
MLS-2000 is a trademark of Santec Photonics Laboratories.
OPTICAL HYPER
SYSTEM
Notes to Users
1) Copyright 1997 Santec Photonics Laboratories. All rights reserved. No part of this Operation
Manual may be reproduced or transmitted in any form or by any means, electronic or mechanical,
for any purpose, without the prior written permission of Santec.
2) Information in this Operation Manual is subject to change without notice.
3) Information of this Operation Manual is prepared with careful examination, however, in the
event of any mistake, please contact us.
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
Introduction
Thank you very much for your having purchased our product, Wide-band Wavelength Tunable
LD Light Source ECL Series.
This Operation Manual contains information necessary for the operation of ECL-200, and it is
indented for those with sufficient knowledge enough to conduct the evaluation of laser danger
and its safe control. Before operating ECL-200, you should first read thoroughly this Operation
Manual and become familiar to its contents. After reading this Operation Manual, keep it at your
fingertip for easy reference at any time.
NOTE !
The packing materials and box of this product are needed for long-term storage or
transportation, therefore, keep them even after unpacking this product.
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ECL-200 OPERATION MANUAL
General Description
Constitution of this Operation Manual and How to Read it
This Operation Manual should be read before operating ECL-200.
This Operation Manual consist of 14 chapters, and the contents of each are as follows:
Chapters 1 through 8 describe the outline of the product, notes on safety, and installation of the
product.
Chapter 9 describes how to operate the product. Before reading Chapter 10, you should read the
descriptions from Chapter 1 through Chapter 8.
Chapter 10 explains information on the communication function such as to control ECL from the
outside.
Chapter 13 describes troubleshooting.
Chapter 14 describes modulation options.
NOTE !
Beforeusingthisproduct,readthisOperationManualfirst.
This instrument uses a semiconductor laser. Caution-Use of controls or adjustments or
performance of procedures other than those specified herein may result in hazardous
radiation exposure.
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
Marking on the instrument
This indicates that caution is required.
Please refer to the operation manual.
This indicates there is a danger due to laser
radiation. Do not look directly at the laser
beam or look at the beam by eye through
any optical instrument.
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ECL-200 OPERATION MANUAL
Explanation of Terms
The meanings of the following terms used in this Operation Manual are defined as below:
(1) Meaning
DANGER --- This indicates pressing DANGER, and if it is not
avoided, personnel death or serious injury results, therefore, it is the
most emphasized special information.
WARNING --- This indicates potential danger, and if it is not
avoided, personnel death or serious injury may result, therefore, it is
a special information.
CAUTION --- This indicates potential danger, and if it is not
avoided, middle or slight injury may result, therefore, it is a special
information. Or it indicates potential danger leading to only physical
damage.
NOTE --- This indicates supplementary explanation of the text,
and thus other information than DANGER, WARNING, and CAUTION.
(2) Importance of Information
From the above meanings, the priority of the terms here are as shown below:
DANGER > WARNING > CAUTION > NOTE
NOTE
DANGER!!
CAUTION
WARNING!
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
Table of Contents
Introduction
Constitution of this Operation Manual and How to Read it
Explanation of Terms
1-1
2-1
3-1
4-1
5-1
6-1
7-1
8-1
1. Outline of Product
2. Configuration
3. Specifications
(Standard Spec.)
4. Principle of Operation
5. Safety Notes and Safety Devices
6. Installation
7. Descriptions of Panel Equipment
8. Functions of This Unit
Front Panel
Rear Panel
Wavelength Tuning Function
LD Drive Current / Temperature Control Function
ACC / APC Function
Set Parameter Memory Function
Coherence Control
7-1
7-5
8-1
8-1
8-1
8-1
8-2
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ECL-200 OPERATION MANUAL
9-19. Fundamental Operation
9-1. Tuning Power ON / Setting delimiter
9-1-1. Turning Power ON
9-1-2. Setting delimiter
9-2. Driving LD
9-3. Switching ACC/APC
9-4. Operation in each mode
9-5. Coherence Control
9-6. Setting wavelength
9-6-1.
Rough adjustment function of transmission wavelength
9-6-2. Fine adjustment of transmission wavelength
9-6-3.
How to set transmission wavelength of ECL-200
9-7. How to shut power OFF
9-1
9-2
9-2
9-3
9-5
9-6
9-7
9-9
9-11
9-12
10-110. Communication
10-1.RS-232C
10-2.RS-232C of ECL-200
10-3.Communication Control
10-4.Sample Program
10-1
10-1
10-3
10-6
11-1
12-1
13-1
11. Maintenance
12. Long-term Storage
13. Troubleshooting
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
1-1
1
ECL-200 is a Manual Tunable LD Light Source Unit developed for multi light source on the basis
of our technologies accumulated in our external cavity type semiconductor laser light source
series.
ECL-200 is a wavelength stable light source wherein a light grid filter arranged inside of light
source is wavelength standard type. High precision temperature control of the light grid filter to
be the wavelength standard has realized highly stable wavelength and wavelength repeatability.
Up to eight channels of ECL-200 may be loaded on multi channel light source power source rack
MLS-8000, which enables you to use ECL-200 as a light source to evaluate WDM
communication and so forth.
Outline of Product
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1-2
ECL-200 OPERATION MANUAL
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
2-1
Configuration
2 Operation Manual (this document) 1 copy
1 ECL-200 mainframe 1 unit
2
ECL-200
EXTERNAL CAVITY TUNABLE LD MODULE
PD.Im
ACC
APC
RF.IN
OPT.OUT
LD.If
SELECT
LD
UP
DOWN
STORE
TEMP FINE
SET
WAVELENGTH
santec
3 Test Data 1 copy
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2-2
ECL-200 OPERATION MANUAL
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
3-1
Guaranteed value Representative value
[Wavelength]
Center wavelength 1550±10nm 1550nm
(Wavelength ) Tuning range >70nm 100nm
( Wavelength ) Tuning resolution Roughadjustment :100±5GHz(About0.8nm) 100±5GHz(About0.8nm)
Fine adjustment :0.01nm 0.005nm
( Wavelength ) Repeatability <±0.1nm*2 <±0.01nm*2
( Wavelength ) stability <±0.01nm(30min) <±0.005nm(30min)
[Output Power ] <±0.05nm(24h)*1
Output Power >4mW(1530〜1570nm) >6mW(1530〜1570nm)
( Output Power ) Repeatability <±0.05dB*2 <±0.05dB*2
( Output Power ) stability <±0.05dB(30min) <±0.005dB(30min)
<±0.1dB(24h)*1
[Spectrum]
Spectrum Linewidth >1MHz >1MHz
SS R >40dB >45dB
[Others]
Communication RS-232C
Power source ±8V、0.7A,±5V、2.0A
Operating temperature range 25±5℃
Maximum relative humidity 80%
Polution class 2
Laser safety class 3A
Dimensions 51×280×129mm
Weight 1.5kg
3
Specifications (Standard Specifications)
*1 : Referential value
*2 : Repeatability at power ON/OFF
Options
• Polarization maintaining fiber output
• FC-APC connector
• RF modulation function (scheduled)
• LF modulation function (scheduled)
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3-2
ECL-200 OPERATION MANUAL
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EXTERNAL CAVITY TUNABLE LD MODULE
ECL-200
4-1
PD
Mirror
LD
ISO
OpticalBPF
θ
OpticalGF
(FSR=100GHz)
ManualRotatingTable
TemperatureControlled
Chamber2
CPU Control
・TemperatureControl
・CurrentControl
・Others
FC-SPC
RS-232C
L1 L2
L3
TemperatureControlled
Chamber1
4
Principle of Operation
FIG.1 Structure diagram of ECL-200
FIG.1 shows the structure of ECL-200.
To the semiconductor laser (LD), employed is a Fabry-Perot type LD whose one end surface is
coated by AR (anti reflection). In the LD block, an inside lens and output lens in an external
cavity to configure an external cavity, and an isolator to prevent return light from the outside are
arranged in a temperature controlled chamber (temperature controlled chamber 1), and
temperature control is carried out by a Peltier element in a high precious manner.
The light injected from AR coated surface of LD is collimated by the external cavity inside lens,
and its wavelength is selected by the optical band path filter (OBPF) and optical grid filter (OGF),
and reflected by the external cavity mirror, and led from the AR coated surface to LD by the
external cavity inside lens once again. When current is supplied into LD and the gain inside of LD
becomes sufficient, laser oscillation is carried out by the external cavity.
The oscillation wavelength of ECL-200 is controlled by OBPF and OGF. Rough adjustment of
oscillation wavelength may be carried out by tuning wavelength of OBPF at every OGF grid
interval (about 100 GHz) (by the manual rotating table). And fine adjustment of the transmission
wavelength may be made by adjusting the position of the wavelength grid through controlling the
environmental temperature of OGF arranged on the temperature controlled chamber
(temperature controlled chamber 2). The light injected from the external cavity laser goes
through 2-step isolator that can restrict the return light by 60 dB and bounded to the optical fiber.
The optical fiber is diagonally processed so as to prevent interferrence in fiber, and only
connector for output employs SPC. (FC-APC connector, and polarization maintaining fiber
output are available as options.) The monitor PD behind the external cavity mirror is used as
monitor for optical output.
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