OPTOKON EDFA User manual

FIBER OPTIC TECHNOLOGY
CALIBRATION LABORATORY
is registered trademark of OPTOKON, a.s. Other names and trademarks mentioned herein may be the trademarks of their respective owners.
ACT_01-07_EN-M
14/11/2011
OPTOKON, a.s. reserves the right to make changes, without notice, to the products described in this document, in the interest of improving design, operational function and/or reliability.
OPTOKON a.s., Cerveny Kriz 250, 586 02 Jihlava, Czech Republic
tel. [phone], fax [phone], WWW.OPTOKON.COM, [e-mail]
1
EDFA Optical Amplifier
CLA - CZECHLIGHT AMPLIFIER
DEVICES
USER MANUAL
(PLEASE READ IT BEFORE USE)
Manufactured under the licence of
Revision 2.4

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2
is the registered trademark of OPTOKON, a.s. Other names and trademarks mentioned
herein may be the trademarks of their respective owners
Manufactured under the licence of
All rights reserved. No parts of this work may be reproduced in any form or by any means - graphic, electronic,
or mechanical, including photocopying, recording, taping or information storage and retrieval systems - without
the written permission of the publisher.
Products that are referred to in this document may be either trademarks and/or registered trademarks of the
respective owners. The publisher and the author make no claim to these trademarks.
While every precaution has been taken in the preparation of this document, the publisher and the author
assume no responsibility for errors or omissions, or for damages resulting from the use of information
contained in this document or from the use of programs and source code that may accompany it. In no event
shall the publisher and the author be liable for any loss of profit or any other commercial damage caused or
alleged to have been caused directly or indirectly by this document.
OPTOKON, a.s.
Cerveny Kriz 250
586 02 Jihlava
Czech Republic
tel. [phone]
fax [phone]
WWW.OPTOKON.COM
[email protected]

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Contents
1Description of CLA amplifier ............................................................................ 5
2General Information ......................................................................................... 6
2.1 Safety precautions .................................................................................... 6
2.2 Optical interface connection: .................................................................... 6
2.3 Laser classification ................................................................................... 7
3Packaging and standard accessories .............................................................. 9
4Technical specification................................................................................... 10
5Basic configuration......................................................................................... 12
6Mechanical design ......................................................................................... 13
6.1 Front panel ............................................................................................. 13
6.2 Display (only version with display -D-) .................................................... 14
6.3 Monitoring port (1% of output No. 1 power) ............................................ 15
6.4 Rear panel .............................................................................................. 15
7Starting operation........................................................................................... 16
8Communication with the device ..................................................................... 17
9Command line................................................................................................ 18
Keyboard and monitor................................................................................... 18
Console......................................................................................................... 18
9.1 Before Login to the CLA ......................................................................... 18
9.2 Login to the CLA ..................................................................................... 19
9.3 IP address setting ................................................................................... 19
9.4 FIREWALL.............................................................................................. 21
9.5 FIREWALL START ................................................................................. 21
9.6 FIREWALL STOP ................................................................................... 21
9.7 CLA Admin ............................................................................................. 21
10 Web administrator interface ....................................................................... 23
10.1 IP address setting ............................................................................... 23
10.2 Connection to the CLA ........................................................................ 23
10.3 Summary............................................................................................. 24
Summary EDFA parameters ......................................................................... 24
Summary System information ....................................................................... 25
Summary Device parameters........................................................................ 25
Summary Network settings ........................................................................... 26
Summary Firewall settings ............................................................................ 26
10.4 Amplifier .............................................................................................. 27
Normal mode................................................................................................. 27
Expert mode.................................................................................................. 29
10.5 Health.................................................................................................. 31
10.6 Network............................................................................................... 32
Network properties ........................................................................................ 32
Firewall.......................................................................................................... 33
10.7 SNMP.................................................................................................. 34
10.8 Postman.............................................................................................. 35
10.9 Log ...................................................................................................... 36
10.10 System ................................................................................................ 37
Account properties ........................................................................................ 37

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Base device information................................................................................ 38
Date and Time............................................................................................... 38
Web interface secure .................................................................................... 39
10.11 Restore ............................................................................................... 39
Backup and Restore configuration ................................................................ 39
CLA Reboot................................................................................................... 40
Load default settings and restart ................................................................... 40
10.12 Logout ................................................................................................. 41
10.13 Display password (optionally).............................................................. 41
11 Display ....................................................................................................... 42
Main menu .................................................................................................... 42
Main menu -> Overview ................................................................................ 42
Main menu -> Health..................................................................................... 42
Main menu -> Alarms .................................................................................... 43
Main menu -> Parameters............................................................................. 43
Main menu -> Parameters -> EDFA 1........................................................... 44
Main menu -> Parameters -> EDFA 1 S1...................................................... 44
Main menu -> Settings .................................................................................. 45
Main menu -> Settings -> EDFA settings ...................................................... 45
Main menu -> Settings -> EDFA settings -> EDFA 1 .................................... 46
Main menu -> Settings -> EDFA settings -> EDFA 1 S1 (Standard mode) ... 46
Main menu -> Settings -> EDFA settings -> Expert / Standard mode ........... 47
Main menu -> Settings -> Network settings................................................... 47
Main menu -> Settings -> Network settings -> Set display password............ 48
Main menu -> Screensaver ........................................................................... 48
Main menu -> Help and About ...................................................................... 48
12 Detailed EDFA Command set .................................................................... 49
13 EDFA education and Application note........................................................ 59
13.1 EDFA education .................................................................................. 59
What`s mean under term “EDFA”.................................................................. 59
EDFA block scheme...................................................................................... 59
EDFA Operational modes ............................................................................. 60
Operational mode settings example.............................................................. 60
13.2 Application note................................................................................... 61
14 Alarms ........................................................................................................ 62
15 Contacts: .................................................................................................... 63

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1Description of CLA amplifier
The CLA is a family of low noise, high performance EDFA designed to support cost
effective and turnkey amplification solutions for fiber optic networks. The CLA EDFA includes
2 in 1 Pre Amp and Booster EDFA. The electronic control board permits the separate control
of the 2 EDFAs.
Different control modes are available:
AGC (automatic gain control)
APC (automatic power control)
ACC (automatic current control) on each stage
Features:
Low noise figures
Wide wavelength range
Low power consumption
Microcomputer control system, including remote control
RS232 , Ethernet, USB interfaces, optionally GSM/GPRS, Wi-Fi
100-230V AC and/or 48V DC PSUs available
Multi channel amplification (e.g. long-haul DWDM)
Single channel amplification (e.g. CATV)
Booster / In-line / Preamp / CATV
LED signalization

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2General Information
2.1 Safety precautions
To ensure a high level of operator safety during installation, commissioning and operating
the equipment, as well as ensuring that the equipment remains undamaged, it is necessary
to consider the following general warnings.
Installation, commissioning, operation and service are only allowed to be
carried out by an authorised person:
Only a person trained in the safety of fiber optical systems can handle and
operate the equipment
The test equipment is intended for / to be used (safe extra low voltage) in this
environment only.
Use only standard or optional accessories supplied by your distributor
Use only the equivalent connector types to those built into the instrument in
order to avoid damage to the instrument components.
During storage and operation the equipment must be kept clean
Do not cover the ventilation holes
The PC ON/OFF switch located on the front controls the microcomputer
operation only. For total deactivation of the device use both switches located
at the rear
After a power outage the device will automatically restart at the previous
status
2.2 Optical interface connection:
Take note of the safety rules for lasers class 3b
Use only the relevant optical connectors
Optical connectors must be clean
Visual check of optical connectors using a 400x magnification microscope must
be performed before connection
In case the connectors are not perfectly clean – please clean them according to
the procedure described in the technical specification for the relevant
connectors
It is recommended to terminate the unused ports, specially CATV version, with
appropriate, terminators defined for max output power.
Please note, the integrated protective dust cap is not designed to eliminate
light emissions from output port.

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2.3 Laser classification
A laser is a light source that can be dangerous to the people exposed to it. Even low power
lasers can be hazardous to eyesight. A person exposed to laser radiation (especially
invisible radiation) may be unaware that damage is occurring. Some lasers are so powerful
that even the diffuse reflection from a surface can be hazardous to the eye. Laser radiation
predominantly causes eye injury via thermal effects on the retina. A transient increase of
only 10 °C can destroy retinal photoreceptors
Lasers have been classified by wavelength and maximum output power into four classes
and a few subclasses since the early 1970s. The classifications categorize lasers according
to their ability to produce damage in exposed people, from class 1 (no hazard during
normal use) to class 4 (severe hazard for eyes and skin). There are two classification
systems, the "old system" used before 2002, and the "revised system" being phased in
since 2002. The latter reflects the greater knowledge of lasers that has been accumulated
since the original classification system was devised, and permits certain types of lasers to
be recognized as having a lower hazard than was implied by their placement in the original
classification system. The revised system is part of the revised IEC 60825 standard. From
2007, the revised system is also incorporated into the US-oriented ANSI Laser Safety
Standard (ANSI Z136.1). Since 2007, labeling according to the revised system is accepted
by the FDA on laser products imported into the US. The old and revised systems can be
distinguished by the 1M, 2M and 3R classes used only in the revised system and the 2A
and 3A classes used only in the old system. Class numbers were designated using Roman
numerals (I–IV) in the US under the old system and Arabic numerals (1–4) in the EU. The
revised system uses Arabic numerals (1–4) in all jurisdictions.
The classification of a laser is based on the concept of accessible emission limits (AEL) that
are defined for each laser class. This is usually a maximum power (in W) or energy (in J)
that can be emitted in a specified wavelength range and exposure time. For infrared
wavelengths above 4 μm, it is specified as a maximum power density (in W/m2). It is the
responsibility of the manufacturer to provide the correct classification of a laser, and to
equip the laser with appropriate warning labels and safety measures as prescribed by the
regulations. Safety measures used with the more powerful lasers include key-controlled
operation, warning lights to indicate laser light emission, a beam stop or attenuator, and
an electrical contact that the user can connect to an emergency stop or interlock
Below, the main characteristics and requirements for the classification system from 2002
are listed, along with typical required warning labels. Additionally, classes 2 and higher
must have the triangular warning label shown here and other labels are required in specific
cases indicating laser emission, laser apertures, skin hazards, and invisible wavelengths
Class 1
A class 1 laser is safe under all conditions of normal use. This means the maximum
permissible exposure (MPE) cannot be exceeded. This class includes high-power lasers
within an enclosure that prevents exposure to the radiation and that cannot be opened
without shutting down the laser. For example, a continuous laser at 600 nm can emit up to
0.39 mW, but for shorter wavelengths, the maximum emission is lower because of the
potential of those wavelengths to generate photochemical damage. The maximum
emission is also related to the pulse duration in the case of pulsed lasers and the degree of
spatial coherence.

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Class 1M
A Class 1M laser is safe for all conditions of use except when passed through magnifying
optics such as microscopes and telescopes. Class 1M lasers produce large-diameter beams,
or beams that are divergent. The MPE for a Class 1M laser cannot normally be exceeded
unless focusing or imaging optics are used to narrow the beam. If the beam is refocused,
the hazard of Class 1M lasers may be increased and the product class may be changed. A
laser can be classified as Class 1M if the total output power is below class 3B but the
power that can pass through the pupil of the eye is within Class 1.
Class 2
A Class 2 laser is safe because the blink reflex will limit the exposure to no more than 0.25
seconds. It only applies to visible-light lasers (400–700 nm). Class-2 lasers are limited to 1
mW continuous wave, or more if the emission time is less than 0.25 seconds or if the light
is not spatially coherent. Intentional suppression of the blink reflex could lead to eye injury.
Many laser pointers are class 2.
Class 2M
A Class 2M laser is safe because of the blink reflex if not viewed through optical
instruments. As with class 1M, this applies to laser beams with a large diameter or large
divergence, for which the amount of light passing through the pupil cannot exceed the
limits for class 2.
Class 3R
A Class 3R laser is considered safe if handled carefully, with restricted beam viewing. With
a class 3R laser, the MPE can be exceeded, but with a low risk of injury. Visible continuous
lasers in Class 3R are limited to 5 mW. For other wavelengths and for pulsed lasers, other
limits apply.
Class 3B
A Class 3B laser is hazardous if the eye is exposed directly, but diffuse reflections such as
from paper or other matte surfaces are not harmful. Continuous lasers in the wavelength
range from 315 nm to far infrared are limited to 0.5 W. For pulsed lasers between 400 and
700 nm, the limit is 30 mJ. Other limits apply to other wavelengths and to ultrashort
pulsed lasers. Protective eyewear is typically required where direct viewing of a class 3B
laser beam may occur. Class-3B lasers must be equipped with a key switch and a safety
interlock.
Class 4
Class 4 lasers include all lasers with beam power greater than class 3B. In addition to
posing significant eye hazards, with potentially devastating and permanent eye damage as
a result of direct beam viewing, diffuse reflections are also harmful to the eyes within the
distance called the Nominal Hazard Zone. Class 4 lasers are also able to cut or burn skin.
In addition, these lasers may ignite combustible materials, and thus represent a fire risk, in
some cases. Class 4 lasers must be equipped with a key switch and a safety interlock.

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3Packaging and standard accessories
Standard accessories
1x CLA amplifier, type according to request
2x Unit Holders (rack mount kit)
2x Power supply cable
2x Key
1x UTP cable
1x User Manual

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4Technical specification
Basic parts
1 or 2 EDFA modules, each contain 1 or 2 amplifiers, in total from 1 to 4
amplifiers
dual power supply units (PSU)
single board PC based microcomputer
Design
standard 2U rack case, size 430 x 300 x 88 mm (W x D x H)
standard 1U rack case, size 435 x 540 x 44 mm (W x D x H)
dual PSUs for redundancy
PSU versions of 100-230 V AC or 48 V DC, maximum consumption 150 W, typical
consumption 50 W
Control
Based on (OS) Linux operating system
Available interfaces
wired: RS-232, Ethernet
wireless: GSM/GPRS/UMTS, Wi-Fi, BlueTooth
Tools for remote management
command line interface (CLI) via SSH, SNMP
critical warnings are sent via e-mail, SNMP Traps can be generated
all important operational parameters are monitored (input and output powers,
alarms, laser diode currents, temperatures, voltages, fan speeds,...)
Basic CLA types
CLA types for amplification of high channel counts (with flat gain characteristics)
PB01F: low noise preamplifier and booster (20 dBm)
PB02F: low noise preamplifier and high power booster (27 dBm)
DI01F: dual inline amplifier
CLA types for single or low channel counts (without flat gain)
PB01: low noise preamplifier and booster (19 dBm)
PB02: low noise preamplifier and high power booster (27 dBm)
DI01: dual inline amplifier
CLA types for CATV application
CA16: 16 output ports CATV amplifier
CA64: 64 output ports CATV amplifier
Booster, inline and preamplifiers
EDFA modules may be selected to best fit your applications
Further CLA types can be tailored to exactly meet your requirements, concerning
different applications and channel counts.

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Optical characteristics of multi-channel amplifiers (with flat gain
characteristics)
Unit Specifications
Pre and In-line Flat Gain Amplifier
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -30 -5
Nominal Gain dB 20
Saturated output power (only signal) dBm + 15
Noise figure dB 4.3 4.8
Unit SpecificationsBooster Flat Gain Amplifier 20 dBm
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -5 0 5
Nominal Gain dB 20
Saturated output power (only signal) dBm + 20
Noise figure dB 6
Unit SpecificationsBooster Flat Gain Amplifier 27 dBm
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -10 0 10
Nominal Gain dB 27
Saturated output power (only signal) dBm + 27
Noise figure dB 6
Optical characteristics of single channel amplifiers (without flat gain
characteristics)
Unit SpecificationsPreAmplifier
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -40 -20
Nominal Gain dB 35
Saturated output power (only signal) dBm + 5
Noise figure dB 4 4.5
Unit SpecificationsIn-line Amplifier
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -30 -5
Nominal Gain dB 30
Saturated output power (only signal) dBm + 15
Noise figure dB 4.3 4.8
Unit SpecificationsBooster Amplifier 20 dBm
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -5 0 5
Nominal Gain dB 20
Saturated output power (only signal) dBm + 20
Noise figure dB 6
Unit SpecificationsBooster Gain Amplifier 27 dBm
Parameters MIN TYP MAX
Signal Wavelength nm 1535 1565
Input optical power dBm -10 0 10
Nominal Gain dB 27
Saturated output power (only signal) dBm + 27
Noise figure dB 6
Optical parameters are predefined values; parameters can be customized on demand.

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5Basic configuration
Block diagram

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6Mechanical design
6.1 Front panel
CLA-PB01F-NSC-D-AC
CLA-CA16-20-NSC-M-D-AC
Block on the panel Legend Description
IN Pre-Amplifier 1 Input
OUT Pre-Amplifier 1 Output
PRE-AMP 1
Monitor 1% Monitor of Pre-Amplifier 1 input (optionally)
IN Booster Amplifier 1 Input
OUT Booster Amplifier 1 Output
BOOSTER 1
Monitor 1% Monitor of Booster Amplifier 1 input (optionally)
IN Pre-Amplifier 2 Input
OUT Pre-Amplifier 2 Output
PRE-AMP 2
Monitor 1% Monitor of Pre-Amplifier 2 input (optionally)
IN Booster Amplifier 1 Input
OUT Booster Amplifier 1 Output
BOOSTER 2
Monitor 1% Monitor of Booster Amplifier 1 input (optionally)
ON/OFF ON/OFF button PC
Reset Reset button PC
COMPUTER
HDD HDD LED PC
5V Green LED indicates 5V
12V Green LED indicates 12V
Pump Blue LED indicates active pump diode – the amplified
optical signal is at the output ports
Loss Yellow LED indicates LOSS of input/output power alarm
(chapter 13)
DIAG.
!RED LED indicates EDFA critical alarm –
temperature of pumping diodes or module is out of
range, the pumping current exceeds limit for end of
life current (chapter 13)
KEY Enable/Disable Amplifier ENABLE/DISABLE
WARNING:
Use only APC connectors (chapter 2.2)
Optical connector must be clean (chapter 2.2)
In case of active RED LED (EDFA alarm) - switch KEY to the Disable
position.

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NOTE:
The EDFA units contain internal memory, they can work independently of
PC function
Green LEDs 5V and 12V indicate internal power supply voltage
Yellow LED indicates EDFA LOSS alarm. The limits shall be set - by
commands LI, LO, see chapter 8, 9, 10)
Key switch position:
Enable or disable EDFA function. Enable – Pump diode ON, Disable – Pump
diode OFF. This setting has effect to ADI alarm (chapter 13)
6.2 Display (only version with display -D-)
Legend Description
Display If LED blinks, the Display module is function
EDFA 1 Present active EDFA unit
Don`t light – the EDFA unit without alarms, don´t active the pump
diode
Green light – the EDFA unit without alarms, active the pump diode
Red light – the EDFA unit report some alarms
(e.g. ADI, LI or LO alarm, see in chapter 13)
EDFA 2 Present active EDFA unit
Don`t light – the EDFA unit without alarms, don´t active the pump
diode
Green light – the EDFA unit without alarms, active the pump diode
Red light – the EDFA unit report some alarms
(e.g. ADI, LI or LO alarm, see in chapter 13)
?Quick help
One step back

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6.3 Monitoring port (1% of output No. 1 power)
6.4 Rear panel

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7Starting operation
Switching on procedure - step by step
Please check the completeness of the product during unpacking
Mount the unit holder – rack mount installation kit on both sides of the amplifier
box
Install the CLA box into the rack
Connect the power supply cable into any power supply socket on the rear panel
Connect the UPS cable into second power supply socket
When you need to change the setting of the optical amplifier – connect to the
CLA according to the description in Chapter 7.
Switch both switches on the power supply sockets ON.
After switching ON – the CLA will start the operation
Initialization of the CLA module starts independently of the PC function.
After finishing all initialization processes, the CLA settings can be changed
according to the description in Chapter 8, 9, 10.

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8Communication with the device
Two available communications with the device:
Command line – chapter 8
Web interface (user friendly) – chapter 9
Optionally - Display module with control keyboard – chapter 10

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9Command line
Communication via command line is not very user friendly and user needs know
basic command for Linux OS.
Use command line for basic Ethernet configuration only!
If user can´t work in Linux OS, we advice use Web interface!
For access to the device via command line use:
a) Keyboard & Monitor (ports on the motherboard)
b) Optional console (serial port on the motherboard, 115200, N, 1)
Keyboard and monitor
Switch OFF PC by PC ON/OFF button or switch both switches on the power
supply sockets OFF
Connect the keyboard and the monitor into the corresponding sockets on the
rear panel.
Switch ON CLA by switches on the power supply units or switch ON PC by PC
ON/OFF button
The access to the CLA modules is established through PC station now.
Console
Use Lap-Link Cable (CLA accessories) and connect it to the corresponding
socket at the rear panel of CLA.
Connect the Lap-Link cable to the your computer
Run Hyperterminal software
Hyperterminal is standard software component of each operating system Windows 98, XP, Vista
Run Hyperterminal by command “hypertrm”
Set Hyperterminal configuration:
Bits per second 115200
Data bits 8
Parity None
Stop bits 1
Flow control None
Press button “Enter”
9.1 Before Login to the CLA
Before login to the CLA is necessary know that all changes made in file
system are stored in the RAM memory only. To save the changes of settings
in the file system of CLA you have to execute the command
savechanges
NOTE: if you don´t use command “savechanges”, all your changes will be lost after restart PC.

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9.2 Login to the CLA
After the PC is switched on you can login to your CLA system. Type login and
password
Factory setting of login:
Login: root
Password: optokon
NOTE: for change of password use command “passwd”
After login to the CLA, system displays the MOTD message “Message Of The
Day”
Message Description Parameter
Serial Number: Serial number of device SERIAL
Device: Type of device DEVICE_TYPE
CLDDistro ver.: Software distribution version VERSION
Location: Location of the CLA LOCATION
Line: Trace from to LINE
Admin: Administrator name ADMIN
Administrator email ADMIN_EMAIL
Administrator phone ADMIN_PHONE
To change the default MOTD the following procedure shall be used:
Edit file /etc/motd.sheet
Run file /etc/init.d/cld-motd
Display new MOTD cat /etc/motd
9.3 IP address setting
For change or setting of IP address use file /etc/network/interfaces.
In this file you can set IP addresses of all network cards
Default Ethernet setting:
NET_IP 192.168.0.10
NET_MASK 255.255.255.0
NET_GATEWAY 192.168.0.1
ifconfig eth0
Example of file for functionally interface eth1 with static IP address:
allow-hotplug eth0
auto eht0
iface eth0 inet static
address 192.168.123.123
netmask 255.255.255.0
gateway 192.168.123.255
NOTE: the attribute “#“ means commentary

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You can use also JOE editor for settings ETH0 as below
joe /etc/network/interfaces
For JOE editor HELP press
ctrl-k h
For SAVE and EXIT JOE editor press
ctrl-k x
For EXIT without SAVE JOE editor press
ctrl-c
To apply the change to the system the execute command shall be used
/etc/init.d/networking restart
WARNING: User has to heed for remote execute this command. After running this
command the network interface card is not available and if any mistake is in the
configuration file the network connection will not work.