Santec OTF-350 User manual

OTF-350
Wavelength & Bandwidth Tunable Filter
Operation Manual

OTF-350 Operation Manual
Trademarks
Notes to Users
1) Copyright 2009, Santec Corporation. 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.
Notes in Bringing This Product Out of Japan
1) When this product is brought out of Japan, some laws or regulations of a destination
country may prohibit this product from being used there. In such countries, the use
of this product may lead to being punished, but Santec Corporation shall not be
responsible in any way.
2) When this product is exported (or brought out of Japan), if this product is applicable
to a strategic material specifed in “Foreign Exchange and Foreign Trade Control Law”,
an export permit of the Japanese Government is then required under the law.
is a trademark of Santec Corporation.
OTF-350 is a trademark of Santec Corporation.

Wavelength & Bandwidth Tunable Filter OTF-350
Introduction
Thank you for purchasing our product, Wavelength & Bandwidth Tunable Filter OTF-
350. This Instruction Manual contains information and precautions necessary for the
operation of OTF-350. This manual is intended for those with suffcient knowledge to
conduct the evaluation of laser danger and its safe control. Before operating OTF-350,
you should frst thoroughly read this Instruction Manual and become familiar with its
contents. After reading this Instruction Manual, keep it close at hand for easy reference
at any time.
The packing materials and box of this product are needed for long-term storage or
transportation, therefore, keep them even after unpacking this product.
NOTE

OTF-350 Operation Manual
Before using this product, please carefully read this Operation Manual.
NOTE
How to Read the Manual
Before operating OTF-350, please read carefully this instruction manual.
This Operation Manual consists of 9 Chapters:
Chapters 1 to 4 illustrate the outline of this product, safety precautions, and installation
of the product.
Chapter 5 describes how to operate the product.
Chapter 6 describes the operating principles.
Chapter 7 explains the specifications.
Chapter 8 describes the maintenance and storage methods of this product.
Chapter 9 describes the troubleshooting in operation.

Wavelength & Bandwidth Tunable Filter OTF-350
Markings on the instrument
This indicates there is a danger due to laser radiation.
Do not directly at any laser beam or look at the beam by eye
through any optical instruments.

OTF-350 Operation Manual
Explanation of Terms
The meanings of the following terms used in this Operation Manual are defined as
below:
(1) Meaning
NOTE
This indicates pressing DANGER, and if it
is not avoided, personnel death or serious
injury results, therefore, it is the most
emphasized special information.
This indicates potential danger, and if it is
not avoided, personnel death or serious
injury may result, therefore, it is special
information.
This indicates potential danger, and if it
is not avoided, mild or slight injury may
result, therefore, it is special information. It
also indicates potential danger leading to
device physical damage.
This indicates supplementary explanation
of the text, and thus other information than
DANGER, WARNING, and CAUTION.
CAUTION
WARNING!
DANGER!!
(2) Importance of Information
From the above meanings, the priority of the terms here are as shown below:
DANGER > WARNING > CAUTION > NOTE
DANGER
WARNING
CAUTION
NOTE

Wavelength & Bandwidth Tunable Filter OTF-350
Introduction
How to Read the Manual
Marking on the instrument
Explanation of Terms
1. Safety Information 1
2. Production Composition 2
3. Panel Description 3
3-1. Front Panel 3-1
3-2. Rear Panel 3-1
3-3. Bottom Panel 3-2
4. Installation 4
5. Basic Operation 5
5-1. Optical Fiber Connection 5-1
5-2. Setting the Wavelength 5-1
5-3. Setting the Bandwidth 5-2
6. Operating Principles 6
7. Specifications 7
8. Maintenance 8
8-1. Daily Maintenance 8-1
8-2. Cleaning the Optical Connector 8-1
8-3. Long-Term Storage 8-1
9. Troubleshooting 9
Contents

OTF-350 Operation Manual

Wavelength & Bandwidth Tunable Filter OTF-350
1-1
1Safety Information
Please note the following points when utilizing the instrument in order to protect the instrument, and
prevent instrument failure.
INPUT, OUTPUT terminals
• Avoid impact or shock.
• Keep this product away from water.
• Do not disassemble this product.
• Do not place anything on this product.
• Do not place in direct sunlight.
• Do not place in an environment with dust, dirt, salt, or corrosive gas.
• Do not place under high temperature and high humidity.
Regarding the OTF-350, when a laser source is input to the “INPUT”, the laser is output
from “OUTPUT”. The laser beam may cause permanent damage to your sense of sight if
it comes in contact with your eyes. Therefore special attention and careful manipulation
must be taken when operating this instrument. When the unit is not in use, be sure to use
the protection cap (shown in the gure below).
Pay attention to the following guidelines.

1-2
OTF-350 Operation Manual

Wavelength & Bandwidth Tunable Filter OTF-350
2-1
This product is composed of the OTF-350 body and accessories.
Check to make sure that all the following items are included.
OTF-350 body (1)
Inspection report (1)
Check to make sure that the product body and the accessories have no scratches or stains. If any item
is found to have scratches or stains, please contact us.
The micrometer is in the locked position to lock the optical stage to prevent the damage during
shipment. Please turn the micrometer until a number is shown (0-13mm), to unlock the optical
stage.
2Production Composition
OTF-350 body (1) Inspection report (1)
Release
d
Release
d
Locked Position of Micrometer from
the factory.(0-13mm)
Position after stage is unlocked
Release
d
Release
d
Release
d
Release
d

2-2
OTF-350 Operation Manual

Wavelength & Bandwidth Tunable Filter OTF-350
3-1
3Panel Description
3-1 Front Panel
3-2 Rear Panel
Figure3-1. Front View
Figure3-2. Rear View
Optical Input
Connector
Optical Output
Connector
The clamp to
lock micrometer
Micrometer head for tuning bandwidth
Micrometer head for tuning wavelength
Nameplate

3-2
OTF-350 Operation Manual
3-3 Bottom Panel
Figure3-3. Bottom View
Rubber legs

Wavelength & Bandwidth Tunable Filter OTF-350
4-1
4Installation
Pay attention to the following guidelines for safe, trouble-free operation.
This product is a high-precision device:
• Do not place in direct sunlight.
• Do not place under high temperature and high humidity.
• Do not place in an environment with dust, dirt, salt, or corrosive gas.
• Do not place in an area subject to large vibrations.
• Do not place in an area where the unit is subject to falling objects landing on it.
• Do not place on an inclining area.
Be sure to install the OTF-350 in a level place (less than 5 degree). It is recommended to install
this product on a vibration-proof base. The unit may not operate correctly if the device is set in an
inclined position.
The mainframe of the OTF-350 weighs about 3.5 kg. Please ensure that the table or shelf upon which
it is installed has sufcient strength.

4-2
OTF-350 Operation Manual

Wavelength & Bandwidth Tunable Filter OTF-350
5-1
5Basic Operation
5-1 Optical Fiber Connection
5-2 Setting the Wavelength
Remove the cap of the optical “INPUT” connector and connect the optical ber to the connector.
Repeat the operation with the optical “OUTPUT” connector.
Set the wavelength by turning the micrometer labeled “Wavelength” for wavelength setting. Turn the
micrometer clockwise for longer wavelengths; turn counter clockwise for shorter wavelengths.
Using the clamp on the micrometer for wavelength tuning, the wavelength can be locked at the
set wavelength. Turn the clamp clockwise to lock the micrometer position; turn the clamp counter
clockwise to release and unlock.
Before connecting an optical fiber, always clean the end face of the connector. In
addition, we recommend that the socket is also periodically cleaned (see Section 8-2). If
dirt is present on either the end face of the connector or the socket, the insertion loss will
be increased. In addition, when high optical powers are used there is the possibility that
the connectors may be damaged by scorching.
Before connecting the input light, check that the optical power does not exceed the
maximum specied level for the OTF-350. The maximum level is +25dBm. If the optical
input exceeds this limit, there is a risk of damage to the OTF-350’s internal optical
elements.
Please use the micrometer within the tuning range*. (display range of 0 – 13mm) Do
not turn the micrometer beyond the tuning range. It might damage the product. The
micrometer is shipped in a locked position, to lock the optical stage and prevent damage
during shipment. Please turn the micrometer until a number is shown (0-13mm) to
unlock the optical tuning stage.
*tuning range : 0-13mm

5-2
OTF-350 Operation Manual
5-3 Setting the Bandwidth
Set the bandwidth by turning the micrometer labeled “Bandwidth” for bandwidth setting. Turn the
micrometer clockwise for wider bandwidths; turn counter clockwise for narrower bandwidths.
Please use the micrometer within the tuning range*. (display range of 0 – 13mm) Do
not turn the micrometer beyond the tuning range. It might damage the product. The
micrometer is shipped in a locked position, to lock the optical stage and prevent damage
during shipment. Please turn the micrometer until a number is shown (0-13mm) to
unlock the optical tuning stage.
*tuning range : 0-13mm

The OTF-350 is a versatile manually optical tunable lter that allows both wavelength tuning and
passband width tuning independently. Unique precision free-space optics and an accurate tuning
mechanism deliver excellent optical control and a at-top passband shape.
Wavelength and bandwidth can independently be set with individual micrometers.
The input light is collimated by an optical ber collimator, then passes to the diffractive grating.
From the grating, the light travels through the lens on to the high reflective mirror surface.
Wavelength tuning and bandwidth tuning is done by the moving the mirror to control the amount of
reected light. The reected light travels back by the same optical path, and a circulator directs it to
the output port.
Wavelength & Bandwidth Tunable Filter OTF-350
6-1
Operating Principles
6
Figure6-1. Principle of the Wavelength&Bandwidth Tunable Filter

6-2
OTF-350 Operation Manual