EXFO XTM-50 Series User manual

www.EXFO.com
XTM-50
Optical Tunable Filter
User Guide
XTM-50_UM_2.0v1.1

XTM-50 User Guide 3
About This Manual
Subject This document explains how to operate the XTM-50 optical tunable filter. It also explains
how to perform basic maintenance operations.
Intended Readers Users of this manual must be familiar with fiber optic technology.
Date 28 June 2018
Manual Reference XTM-50_UM_2.0v1.1
Typographical
Conventions
Symbols
Abbreviations
Used
Copyright Copyright © 2013–2018 by EXFO. Published by EXFO. All rights reserved.
This documentation is provided as a user guide to EXFO customers and potential
customers only. The contents of this document may not be reproduced in any part or as
a whole, transcribed, stored in a retrieval system, translated into any language, or
transmitted in any form or by any means (electronic, mechanical, magnetic, optical,
chemical, photocopying, manual, or otherwise) without the prior written permission of
EXFO.
bold Identifies graphical interface objects such as menu names, labels,
buttons and icons.
italic Identifies references to other sections or other guides.
monospace Identifies portions of program codes, command lines, or messages
displayed in command windows.
IMPORTANT Identifies important information to which you must pay particular
attention.
Warning
Indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury. Do not proceed unless you understand and meet the
required conditions.
Caution
Indicates a potentially hazardous situation which, if not avoided, may result in
component damage. Do not proceed unless you understand and meet the
required conditions.
Abbreviation Meaning
FWHM Full Width Half Maximum

About This Manual
4XTM-50 User Guide
Product Warranty
and Limitation of
Warranty
For detailed information about the sales terms and conditions, visit the EXFO web site at
www.exfo.com/how-to-buy/sales-terms-conditions
Contact
Information
To obtain after-sales service or technical support for this product, contact EXFO at one of
the following numbers.
For detailed information about technical support and for a list of other worldwide
locations, visit the EXFO web site at
www.EXFO.com/support
To accelerate the process, please have information such as the name and the serial
number (see the product identification label), as well as a description of your problem,
close at hand.
Technical Support Group
400 Godin Avenue
Quebec (Quebec) G1M 2K2
CANADA
Tel. USA and Canada: 1 866 683-0155
Fax: [phone]
E-mail: [e-mail]

XTM-50 User Guide 5
Table of Contents
About This Manual..................................................................................................................................... 3
Table of Contents ...................................................................................................................................... 5
1. Product Presentation .......................................................................................................................... 7
1.1 Technical Specifications ....................................................................................................................... 7
1.2 Product Overview................................................................................................................................... 8
2. Installing and Connecting the XTM-50............................................................................................... 11
2.1 Unpacking and Installing the XTM-50................................................................................................. 11
2.2 Connecting an Optical Source to the XTM-50.................................................................................... 12
3. Setting the Wavelength/Frequency and FWHM Values....................................................................... 13
3.1 Adjusting the Central Wavelength....................................................................................................... 13
3.2 Adjusting the FWHM............................................................................................................................ 15
3.3 Reaching a Position on the Bandwidth or Wavelength Tuning Actuator ......................................... 17
4. Performing Basic Maintenance Operations........................................................................................ 19
4.1 Cleaning Optical Connectors............................................................................................................... 19
4.2 Cleaning the Cover of the XTM-50...................................................................................................... 20
4.3 Packaging for Shipment ...................................................................................................................... 21
List of Figures .......................................................................................................................................... 23

Table of Contents
6XTM-50 User Guide

XTM-50 User Guide 7
1. Product Presentation
The XTM-50 is a reliable optical tunable filter that features wavelength and bandwidth
tuning. The large wavelength range, the narrow FWHM and the flat-top shape ensure a
clean extraction of the optical signal. It is designed for closely-spaced channel selection
and extraction in DWDM applications.
The XTM-50 is based on the use of a reflection diffraction grating mounted in a Littman-
Metcalf configuration.
When an optical signal is detected at the XTM-50 input port, the input wave is directed
towards the output port after passing through the XTM-50 monochromator.
1.1 Technical Specifications
The following table lists the technical specifications of all the XTM-50 models.
Standard Ultrafine O-band*1 Wide
Optical Characteristics
Wavelength range 1450–1650 nm 1480–1620 nm 1260–1360 nm 1525–1610 nm
Wavelength resolution 5 pm*2 5 pm*2 5 pm*2 5 pm*2
Minimum bandwidth
(FWHM) 50 pm (6.25 GHz) 32 pm (4 GHz) 50 pm (8 GHz) 50 pm (6.25 GHz)
Maximum bandwidth
(FWHM) 950 pm (120 GHz) 650 pm (80 GHz) 900 pm (160 GHz) 5000 pm (625 GHz)
Bandwidth resolution 1 pm 1 pm 1 pm 0.3 % of FWHM typ.
Filter edge gradient 500 dB/nm
typical*3 800 dB/nm typical 500 dB/nm
typical*3
500 dB/nm
typical*4
Insertion loss 5 dB (4.5 dB
typical)*5*6
5 dB (4.0 dB
typical)*6*7
5 dB (4.5 dB
typical)*6*8
5 dB (4.5 dB
typical)*9*10
Flatness 0.2 dB*11 0.2 dB*12 0.3 dB*11*13 0.2 dB*14
Polarization dependent
loss ±0.2 dB*5 ±0.2 dB*7 ±0.2 dB*8 ±0.2 dB*9
Out-of-band suppression
(crosstalk)
40 dB (60 dB
typical)*15
40 dB (50 dB
typical)*15
40 dB (60 dB
typical)*15
40 dB (45 dB
typical)*15
Interface
Optical fiber type SMF or PMF SMF
Connector type FC/PC or FC/APC
Operating Conditions
Maximum optical input
Power 30 dBm 27 dBm
Temperature range 15° to 35°C, indoor use only
Storage Temperature -20°C to 60°C
Maximum Relative
Humidity
80 % for temperatures up to 31°C decreasing
linearly to 50 % relative humidity at 40°C
Altitude 2000 m (maximum operating)

Product Presentation
8XTM-50 User Guide
1.2 Product Overview
Figure 1: Front Panel
Handle
The handle bar enables you to:
•Carry the XTM-50, if positioned in front of the actuators.
•Tilt the XTM-50 for convenient purpose, if positioned below the unit: see section
Unpacking and Installing the XTM-50, p. 11.
The two buttons located at both ends of the handle enable you to rotate it forward or
backward.
Size & Weight
Dimensions (W x D x H) 230 x 173 x 136 mm
Weight 2.2 kg
All optical specifications apply at constant temperature.
*1: Specifications apply for wavelengths not equal to any water absorption line.
*2: Typical, related to user dexterity.
*3: From -3 and -40 dB for FWHM <800 pm.
*4: Between -3 and -40 dB. Typically 550 dB/nm @ FWHM = 50 pm,
450 dB/nm @ FWHM = 1 nm, 225 dB/nm @ FWHM = 5 nm.
*5: From 1500 to 1600 nm & FWHM >100 pm.
*6: At lowest FWHM the insertion loss is 7 dB typical.
*7: From 1500 to 1600 nm & FWHM >60 pm.
*8: From 1280 to 1340 nm & FWHM >100 pm.
*9: For FWHM >100 pm.
*10: At lowest FWHM the insertion loss is < 7.0 dB.
*11: Centered width of FWHM - 150 pm. For 150 pm < FWHM < 650 pm.
*12: Centered width of FWHM - 100 pm. For 100 pm < FWHM < 500 pm.
*13: From 1280 to 1340 nm.
*14: Centered width of FWHM - 150 pm. For 150 pm < FWHM < 2000 pm.
*15: Measured 1 nm away from the -3 dB points.
Optical
Connectors
Connector’s
drawer
Handle
Bandwidth
Actuator
Wavelength Actuator:
Coarse Adjustment
Fine Adjustment
Drawer screw
Handle
Button
Lock

Product Presentation
XTM-50 User Guide 9
Micrometer Actuators
Two high resolution micrometer actuators enable you to perform wavelength and
bandwidth tuning.
The screw located on top of the actuators enable you to lock the actuator at the wanted
setting.
•The bandwidth actuator is composed of two graduated scales:
•On the sleeve: 13 mm stroke with 0.5 mm graduation interval.
•On the thimble (rotary part): 250 μm by turn, with 5 μm graduation interval.
•The wavelength actuator includes coarse and fine position adjustments, with four
graduated scales:
•Coarse adjustment:
•On the sleeve: 13 mm stroke with 0.5 mm graduation interval.
•On the thimble (rotary part): 0.5 mm by turn, with 0.01 mm graduation
interval.
•Fine adjustment:
•On the sleeve: 200 μm stroke with 25 μm graduation interval.
•On the thimble: 25 μm by turn, with 0.5 μm graduation interval.
For more details on how to adjust wavelength and FWHM, see section Setting the
Wavelength/Frequency and FWHM Values, p. 13.
Optical Connectors
The two following optical connectors, protected by a dust cap, are located on the front
panel:
•Input: channel filter input port.
•Output: channel filter output port.
The two optical connectors are mounted on a drawer, which enables you to access the
internal optical connectors for cleaning (see section Cleaning Optical Connectors, p. 19).
Retractable Legs
The retractable legs located underneath the unit enable you to tilt the XTM-50 upward for
convenient purpose, so that it stands on both front legs and the rear feet (see section
Unpacking and Installing the XTM-50, p. 11).
Labels
Label Description
Identification of the Product
Indicates serial number, model, options (if any), CE
marking (see section Certification and Compliance, p. 27)
and date of manufacture.
Warranty Seal
The XTM-50 cover must not be open, otherwise the
warranty is not valid anymore.
MANUFACTURED
OPTIONS
MODEL
SERIAL NUMBER
Made in Franc e
xxxxxxxx xxxx
XTM-50
xxxxxxxxxxxx
xxxxxxxxxxxx
Warranty void
if seal broken.

Product Presentation
10 XTM-50 User Guide