ILX Lightwave LDM-4980 Series User manual

User’s Guide
LDM-4980 Series
Laser Diode Mount
ILX Lightwave Corporation P. O.Box 6310 Bozeman, MT, U.S.A. 59771 :· · · 1-800-459-9459 · ·
www.ilxlightwave.com
U.S. & Canada International Inquiries: 406-586-1244 Fax [phone]
E-mail: [email protected]
70022504_R01_05_05

TABLE OF CONTENTS
07_04 LDM-4980 Series i

                 
TABLE OF CONTENTS
Table of Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i
List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iii
List of Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . v
Safety and Warranty Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . vii
Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Safety Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Safety Marking Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ix
Comments, Suggestions, and Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . x
Chapter 1 Introduction
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 2 Operation
Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LDM-4980 General Wiring Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
LDM-4986 Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
LDM-4983 and LDM-4989
Hotplate and Laser Diode Case Potential Wiring . . . . . . . . . . . . . . . . . . . 11

TABLE OF CONTENTS
ii LDM-4980 Series

Electrical Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
ILX Lightwave Current Source Interlock Feature . . . . . . . . . . . . . . . . . . . . 12
ILX Lightwave Model CC305S Interconnect Cable . . . . . . . . . . . . . . . . . . 12
Laser Diode Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LDM-4982, DIL Laser Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
LDM-4982M Mini-DIL Laser Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
LDM-4984 and LDM-4989, Two-Sided Butterfly Laser Mounting . . . . . . . . . 15
LDM-4983 Single-Side Butterfly Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 15
LDM-4986, Connectorized Laser Mounting . . . . . . . . . . . . . . . . . . . . . . . . . 16
Bias-T Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Case Temperature Control Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Current Sources and Current Measurements . . . . . . . . . . . . . . . . . . . . . . . . . 17
Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Chapter 3 Maintenance
Chapter 4 Safety

LIST OF FIGURES
07_04 LDM-4980 Series iii

                 
LIST OF FIGURES
Figure 2.1 Bottom View of a Typical LDM-4980 Mount
(Bottom Cover Removed) . . . . . . . . . . . . . . . . . . . . . . . .6
Figure 2.2 Mount Bottom Covers . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
Figure 2.3 Fujitsu “LK” Package Laser Diode . . . . . . . . . . . . . . . . . .10
Figure 2.4 LDM-4892M Pin 1 Location . . . . . . . . . . . . . . . . . . . . . . .14

LIST OF FIGURES
iv LDM-4980 Series


LIST OF TABLES
07_04 LDM-4980 Series v

                 
LIST OF TABLES
Table 1.1 ILX Lightwave Mount Types and Packages. . . . . . . . . . . . .2
Table 2.1 Laser Diode Pin Configuration with Internal TEC. . . . . . . . .7
Table 2.2 Butterfly Package Wiring Configuration . . . . . . . . . . . . . . . .8
Table 2.3 LDM-4986 Connector Configuration and Wire Colors . . . .10
Table 2.4 Connectorized Laser Diode Wiring Configuration . . . . . . .11

LIST OF TABLES
vi LDM-4980 Series


LDM-4982M vii

S AFETY AND W ARRANTY I NFORMATION
The Safety and Warranty Information section provides details about cautionary symbols used in the
manual, safety markings used on the instrument, and information about the Warranty including
Customer Service contact information.
Safety Information and the Manual
Throughout this manual, you will see the words Caution and Warning indicating potentially
dangerous or hazardous situations which, if not avoided, could result in death, serious or minor
injury, or damage to the product. Specifically:
!
CAUTION
Caution indicates a potentially hazardous situation which can result in minor or
moderate injury or damage to the product or equipment.
WARNING
Warning indicates a potentially dangerous situation which can result in serious injury or
death.
WARNING
Visible and/or invisible laser radiation. Avoid direct exposure to the beam.
General Safety Considerations
If any of the following conditions exist, or are even suspected, do not use the instrument until safe
operation can be verified by trained service personnel:
•Visible damage
•Severe transport stress
•Prolonged storage under adverse conditions
•Failure to perform intended measurements or functions
If necessary, return the instrument to ILX Lightwave, or authorized local ILX Lightwave distributor, for
service or repair to ensure that safety features are maintained (see the contact information on page
x).
All instruments returned to ILX Lightwave are required to have a Return Authorization Number
assigned by an official representative of ILX Lightwave Corporation. See Returning an Instrument on
page ix for more information.

SAFETY SYMBOLS
viii LDM-4982M

S AFETY S YMBOLS
This section describes the safety symbols and classifications.
Technical specifications including electrical ratings and weight are included within the manual. See
the Table of Contents to locate the specifications and other product information. The following
classifications are standard across all ILX Lightwave products:
•Indoor use only
•Ordinary Protection: This product is NOT protected against the harmful ingress of moisture.
•Class I Equipment (grounded type)
•Mains supply voltage fluctuations are not to exceed ±10% of the nominal supply voltage.
•Pollution Degree II
•Installation (overvoltage) Category II for transient overvoltages
•Maximum Relative Humidity: <80% RH, non-condensing
•Operating temperature range of 0 ×C to 40 ×C
•Storage and transportation temperature of ñ40 ×C to 70 ×C
•Maximum altitude: 3000 m (9843 ft)
•This equipment is suitable for continuous operation.
Safety Marking Symbols
This section provides a description of the safety marking symbols that appear on the instrument.
These symbols provide information about potentially dangerous situations which can result in death,
injury, or damage to the instrument and other components.
Caution,
refer to
manual
Earth
ground
Terminal
Alternating
current
Visible and/or
invisible laser
radiation
Caution, risk
of electric
shock
Protective
Conductor
Terminal
Caution, hot
surface
Frame or
chassis
Terminal
On: In position of a bistable push control. The
slash (I) only denotes that mains are on.
Off: Out position of a bistable push control.
The circle (O) only denotes that mains are off.
or
(I) or
(O)

WARRANTY
LDM-4982M ix

W ARRANTY
ILX LIGHTWAVE CORPORATION warrants this instrument to be free from defects in material and
workmanship for a period of one year from date of shipment. During the warranty period, ILX will
repair or replace the unit, at our option, without charge.
Limitations
This warranty does not apply to fuses, lamps, defects caused by abuse, modifications, or to use of
the product for which it was not intended.
This warranty is in lieu of all other warranties, expressed or implied, including any implied warranty
of merchantability or fitness for any particular purpose. ILX Lightwave Corporation shall not be liable
for any incidental, special, or consequential damages.
If a problem occurs, please contact ILX Lightwave Corporation with the instrument's serial number,
and thoroughly describe the nature of the problem.
Returning an Instrument
If an instrument is to be shipped to ILX Lightwave for repair or service, be sure to:
1Obtain a Return Authorization number (RA) from ILX Customer Service.
2Attach a tag to the instrument identifying the owner and indicating the required service or
repair. Include the instrument serial number from the rear panel of the instrument.
3Attach the anti-static protective caps that were shipped with the instrument and place the
instrument in a protective anti-static bag.
4Place the instrument in the original packing container with at least 3 inches (7. 5 cm) of
compressible packaging material. Shipping damage is not covered by this warranty.
5Secure the packing box with fiber reinforced strapping tape or metal bands.
6Send the instrument, transportation pre-paid, to ILX Lightwave. Clearly write the return
authorization number on the outside of the box and on the shipping paperwork. ILX
Lightwave recommends you insure the shipment.
If the original shipping container is not available, place your instrument in a container with at least 3
inches (7.5 cm) of compressible packaging material on all sides.
Repairs are made and the instrument returned transportation pre-paid. Repairs are warranted for the
remainder of the original warranty or for 90 days, whichever is greater.
Claims for Shipping Damage
When you receive the instrument, inspect it immediately for any damage or shortages on the
packing list. If the instrument is damaged, file a claim with the carrier. The factory will supply you with
a quotation for estimated costs of repair. You must negotiate and settle with the carrier for the
amount of damage.

WARRANTY
x LDM-4982M

Comments, Suggestions, and Problems
To ensure that you get the most out of your ILX Lightwave product, we ask that you direct any
product operation or service related questions or comments to ILX Lightwave Customer Support.
You may contact us in whatever way is most convenient:
Phone . . . . . . . . . . . . . . . . . . . . . . . . . . . [phone] or [phone]
Fax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [phone]
Email. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .[email protected]
Or mail to:
ILX Lightwave Corporation
P. O. Box 6310
Bozeman, Montana, U.S.A 59771
www.ilxlightwave.com
When you contact us, please have the following information:
If ILX Lightwave determines that a return to the factory is necessary, you are issued a Return
Authorization (RA) number. Please mark this number on the outside of the shipping box.
You or your shipping service are responsible for any shipping damage when returning the instrument
to ILX Lightwave; ILX recommends you insure the shipment. If the original shipping container is not
available, place your instrument in a container with at least 3 inches (7.5cm) of compressible
packaging material on all sides.
We look forward to serving you even better in the future!
Model Number:
Serial Number:
End-user Name:
Company:
Phone:
Fax:
Description or sketch of what
is connected to the ILX
Lightwave instrument:
Description of the problem:

LDM-4980 Series 1

CHAPTER 1
                 
INTRODUCTION
This manual describes the LDM-4980 Series Laser Diode Mounts and related
accessories and options and explains their operation. Information is also provided
to assist in customizing this mount to satisfy specific laser mounting needs. This
chapter provides an overview of the LDM-4980 Series Laser Diode Mounts and
contains general information and specifications important in their use.
You should read the entire manual to familiarize yourself with the operation of your
LDM-4980 Laser Diode Mount before installing laser diodes. In particular, you
should read the section on Electrical Connections before installing a laser diode.
The information contained in this section is necessary to provide correct electrical
connection to your particular laser.
Product Overview
The LDM-4980 Series of laser diode mounts provides a compact, easy-to-use
solution for laser diode fixturing. These mounts are available in DIL, Mini-DIL,
butterfly and connectorized laser diode package versions. Butterfly versions are
available for 7-pin, 13-pin, 14-pin, 20-pin and 26-pin packages. This series of
mounts accommodates most telecom laser module types including CW, directly
modulated (Bias-T), 2.5 Gbits/s, 10 Gbits/s, and tunable DFB laser modules. Each
mount features ILX Lightwave’s standard 9-pin D-sub input connectors for laser
current and temperature control with configurable pin designations to
accommodate virtually any laser diode pin configuration. Zero insertion force (ZIF)
sockets and spring-loaded clamps facilitate easy of mounting. Bias-T options
include a 50 ΩSMA input connector and circuitry for directly modulating the laser
drive current.
The TE-550 Case Temperature Control option is available for all of these laser
diode mounts and comes standard on the LDM-4982M and LDM-4986. Case
temperature control is ideal for applications requiring tight temperature stability,
different case temperatures, or for testing laser diodes at a wider temperature
range than can be accomplished with the internal TEC. The LDM-4980 Series

INTRODUCTION
Product Overview
2 LDM-4980 Series
CHAPTER 1

offers a high-value laser diode fixturing solution, and are ideal for use with ILX
Lightwave laser diode control instrumentation.
Table 1.1 ILX Lightwave Mount Types and Packages
1. Modulation bandwidth with Bias-T option.
2. Typically 10Gbit/s laser application. All pins are on one side of laser package and coaxial RF connector is
on other side of laser package.
3. LDM-4983 13-pin RF mount can be used with 7-pin butterfly laser package by using every other pin of the 13-pin ZIF socket and
wiring the mount accordingly.
4. Typically 2.5GHz laser application. Mount connects RF launch block to pin-12 for internal Bias-T. LDM-4984RF mount designed for
lasers with 25 input impedance to internal Bias-T modulation. The RF input on the mount is a 50 ΩSMA connector.
5. TE-550 External Case Temperature Control is standard on the LDM-4982M and LDM-4986 mount.
The LDM-4980 mounts allow direct interfacing to all of ILX Lightwave's current
sources and temperature controllers through standard ILX cables (except LDM-
4989). This feature gives you the flexibility to select the proper current source or
temperature controller for your particular application.
Within the laser mount, screw-lead configuration headers allow you to configure
the wiring of the mount to accept variations of laser package pin-outs. The
LDM-4982 and LDM-4984 mounts are available with a Bias-T option to facilitate
high-speed laser current modulation. The Bias-T option accepts a 50 Ω
impedance-matched modulation input through a standard SMA RF connector.
Wiring is provided for controlling the laser's internal thermoelectric modules. In
addition, the TE-550 case temperature control option is available. This option
allows for simultaneous and independent control of both laser die temperature
and package temperature for controlled-environment testing or where extreme
temperature stability is required.
Model
Number Package
Type Bias-T Option Modulation Bandwidth RF Input Impedance Hot Plate Connection
LDM-4982 DIL 481 10 MHz - 800
MHz150Ω1Floating
LDM-4982M5Mini-DIL -- -- -- Floating
LDM-4983 13-pin RF
Butterfly2
7-pin RF
Butterfly3
-- See Note 2 -- User Configurable
LDM-4984 14-pin
Butterfly 482 A/B 10 MHz - 800 MHz150Ω1Floating
LDM-
4984RF4 14-pin
Internal
Bias-T
Modulated
-- 10 MHz - 2.5 GHz 50Ω / 25ΩFloating
LDM-49865Connectori
zed -- -- -- Floating
LDM-4989 26-pin
Butterfly
20-pin
Butterfly
-- -- -- User Configurable

INTRODUCTION
Specifications
07_04 LDM-4980 Series 3
CHAPTER 1

The LDM-4980 consists of a housing, laser heat sink/PCB assembly, and a
bottom cover. The housing includes a grounding receptacle for a wrist strap, as
well as a grounded laser cover to improve thermal stability and help shield the
laser from radiated noise and transients.
Specifications
1. Optional except on LDM-4982M. See ordering information. Case TE option adds approximately 1.5” to width and 0.3” to height of
mount. Baseplate may be affixed to optical table for additional heat sink. (Screws are included.)
2. Typical case temperature control range. Actual temperature range depends on ambient temperature, environmental conditions, and
heat generated in laser module.
3. Colder temperatures must be in non-condensing environment.
4. Optional. See ordering information. Bias-T options allow user configuration of laser pins except for LD cathode and anode. (See
table). Bandwidth measured at laser pin. Actual optical modulation BW is dependent upon laser used.
LDM Model Number Package Type
LDM-4982 DIL
LDM-4982M Mini-DIL
LDM-4983 13-pin, RF; 7-pin RF
LDM-4984 14-pin Butterfly
LDM-4986 Connectorized
LDM-4989 26-pin Butterfly; 20-pin Butterfly
Input Connectors
9-pin D-sub Connectors 1. Laser diode current (female)
2. Internal laser temperature control (male)
3. Case temperature control (male)
TE550 Case Temperature Control Option1
Temperature Control Range2,3 -5oC to 85oC
Sensor Type 10kΩThermistor
TE Module Ratings Qmax = 14 W, ∆Tmax = 70oC
Imax = 6.0 A, Vmax = 4.2 V
Bias-T Option RF Input Specifications4
Modulation Bandwidth 10MHz to 800MHz
Input Impedance 50Ω
Connector SMA
General
Size (HxWxD) 1.25” x 4.0” x 5.5” (31.8mm x 102mm x 140mm)
Weight 1.4 pounds (0.64 kg)

INTRODUCTION
Specifications
4 LDM-4980 Series
CHAPTER 1

Our goal is to make the best laser diode instrumentation available anywhere. To
achieve this, we need your ideas and comments on ways we can improve out
products. We invite you to contact us at any time with your suggestions.
Pin Configurations for Bias-T Option
Type A B
Package Type DIL0000000000Butterfly Butterfly
Mount Option 481 Bias-T0000482A Bias-T 482B Bias-T
Pin 1,2 * *
Pin 3 * *
Pin 4-8 * *
Pin 9 Laser Cathode *
Pin 10 Laser Anode / Case Ground Laser Anode / Case Ground
Pin 11 * Laser Cathode
Pin 12 * *
Pin 13 * *
Pin 14 * *

LDM-4980 Series 5

CHAPTER 2
                 
OPERATION
This chapter describes the electrical configuration and mounting of laser diodes.
Generic procedures that apply to all mounts in the series are referred to as LDM-
4980. Procedures that are specific to a mount are prefaced with the particular
model number (LDM-4982, LDM-4984, etc.)
Electrical Connections
Laser diodes are extremely susceptible to damage caused by electrostatic discharge and
surge currents. To avoid early failure or damage to the device, workers and work
benches must be grounded at all times when handling or working with laser diodes.
For more information on laser diode protection strategies, refer to Application
Note #3, "Protecting Your Laser Diode." This document is available from your ILX
Lightwave representative, or you can find it on our website www.ilxlightwave.com.
LDM-4980 General Wiring Instructions
The LDM-4980 Series Mounts are equipped with configurable pin headers which
allow the mount to be configured for any appropriate laser diode pin-out. These
headers are accessed by unscrewing the rubber feet on the bottom of the mount
and removing the bottom cover or by removing the bottom plate if the mount is
configured with the TE-550 case control option.
A drawing of the inside of a typical LDM-4980 mount is shown in Figure 2.1.
Holding the mount upside down, notice the configuration headers on the left and
right of the printed circuit board and pedestal. The pin headers are connected to
the laser socket(s) via the printed circuit board, the numbers next to the headers
designate the laser pin number. There are up to three 9-pin D connectors in the
mount for laser current control, laser internal temperature control, and laser case

OPERATION
Electrical Connections
6 LDM-4980 Series
CHAPTER 2

temperature control. The pair of 9-pin connectors are the laser current control and
laser internal temperature control. The one 9-pin connector opposite the two
together, is for case temperature control only if the mount is configured with the
case temperature control option. Color coded wires are soldered to the 9-pin D-
connectors and un-terminated at the other end. These connectors mate with the
current and temperature control cables from ILX Lightwave laser current sources
and temperature controllers, therefore, the pin designations are pre-determined
by the instrumentation. These pin-outs with their corresponding wire color are
shown on the inside of the bottom cover of the laser diode mount.
Figure 2.1 Bottom View of a Typical LDM-4980 Mount (Bottom Cover Removed)
The mount is configured for your laser diode by connecting the color coded wires
from the 9-pin connector to the corresponding pin on the configurable header.
Insert the wire into the header and tighten the clamping screw. The connector pin
designations and wire color codes for most LDM-4980 Series Laser Diode Mounts
except the LDM-4986 are shown in Figure 2.2.

OPERATION
Electrical Connections
07_04 LDM-4980 Series 7
CHAPTER 2

Figure 2.2 Mount Bottom Covers
An example for a laser diode with internal TEC is given below:
Table 2.1 Laser Diode Pin Configuration with Internal TEC
Note: Information Courtesy of Bookham Technology
Pin # Description Pin # Description
1 Peltier Cooler (+) 8 Not Connected
2 Thermistor 9 Not Connected
3 Monitor Anode (-) 10 Laser Anode (+)
4 Monitor Cathode (+) 11 Laser Cathode (-)
5 Thermistor 12 Not Connected
6 Not Connected 13 Case Ground
7 Not Connected 14 Peltier Cooler (-)

OPERATION
Electrical Connections
8 LDM-4980 Series
CHAPTER 2

To configure the mount for this particular laser diode, follow the instructions below:
1Starting with pin 1, Peltier cooler (+), you would connect the red wire from the 9-pin male
Internal Laser Temp Control connector to pin 1 of the configurable header.
2Next, pin 2 of the laser is the thermistor, connect the orange wire from the 9-pin male
Internal Laser Temp Control connector to pin 2 of the configurable header.
3For pin 3, monitor anode, connect the gray wire from the 9-pin Female Laser Current
Control connector to pin 3 of the configurable header.
4For pin 4, monitor cathode, connect the blue wire from the 9-pin Female Laser Current
Control connector to pin 4 of the configurable header.
5For pin 5, thermistor, connect the yellow wire from the 9-pin male Internal Laser Temp
Control connector to pin 5 of the configurable header.
6There are no connections for pin 6, 7, 8 and 9.
7For pin 10, laser anode, connect the white wire from the 9-pin Female Laser Current
Control connector to pin 10 of the configurable header.
8For pin 11, laser cathode, connect the brown wire from the 9-pin Female Laser Current
Control connector to pin 11 of the configurable header.
9There are no connections for pin 12 and 13.
10 To finish the wiring, for pin 14, peltier cooler (-), connect the black wire from the 9-pin male
Internal Laser Temp Control connector to pin 14 of the configurable header.
The configuration information with connector designation with corresponding wire
color is summarized in Table 2.2.
Table 2.2 Butterfly Package Wiring Configuration
Pin Designation Wire
Color Mount Connector Pin Designation Wire Color Mount Connector
1 TE Cooler (+) Red Internal
laser temp
control
8 NC -----
2 Thermistor Orange Internal
laser temp
control
9 NC ------
3 Monitor
Anode (-) Gray Laser current
control
10 Laser Anode
(+) White Laser current
control
4 Monitor
Cathode (+) Blue Laser current
control
11 Laser
Cathode (-) Brown Laser current
control
5 Thermistor Yellow Internal
laser temp
control
12 NC ------
6 NC ------ 13 NC ------
7 NC ------ 14 TE Cooler (-) Black Internallaser
temp control