ILX Lightwave OMH-6727B User manual

User’s Guide
InGaAs Power/Wavehead
OMH-6727B
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]
70023404_R01_09/04

LIST OF FIGURES
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LIST OF FIGURES
Figure 2.1 OMM-6810B Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2.2 Rear Panel Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2.3 Power Analog Out . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 2.4 OMH-6722B Optical Measurement Head . . . . . . . . . . . . . 9
Figure 2.5 Wavelength Setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3.1 Command Path Structure . . . . . . . . . . . . . . . . . . . . . . . . 18

LIST OF FIGURES
iv OMH-6727B
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LIST OF TABLES
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LIST OF TABLES
Table 3.1 Device-Dependent Commands valid with the OMH-6722B 17
Table 3.2 Device-Dependent Commands which are not usable
with the OMH-6722B 18

LIST OF TABLES
vi OMH-6727B
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OMH-6727B vii
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SAFETY AND WARRANTY INFORMATION
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 indicates a potentially hazardous situation which can result in minor or
moderate injury or damage to the product or equipment.
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 xi).
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
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SAFETY SYMBOLS
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 –40 °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
Te r m i n a l
Alternating
current
Visible and/or
invisible laser
radiation
Caution, risk
of electric
shock
Protective
Conductor
Te r m i n a l
Caution, hot
surface
Frame or
chassis
Te r m i n a l
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
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WARRANTY
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.

WARRANTY
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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
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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]
On the web at: . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ilx.custhelp.com
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
Model Number:
Serial Number:
End-user Name:
Company:
Phone:
Fax:
Description of what is
connected to the ILX
Lightwave instrument:
Description of the problem:

WARRANTY
xii OMH-6727B
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in a container with at least 3 inches (7.5 cm) of compressible packaging material
on all sides.
We look forward to serving you even better in the future!

TABLE OF CONTENTS
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TABLE OF CONTENTS
Safety Information and the Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
General Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .vii
Safety Marking Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . viii
Comments, Suggestions, and Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . xi
Chapter 1 Introduction and Specifications
Product Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Safety Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Available Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Chapter 2 Operation
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Front Panel Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Unused Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Error Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Rear Panel Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Input Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Analog Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General Operating Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Warm-up and Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . 9
Beam Alignment Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

TABLE OF CONTENTS
2 OMH-6727B
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Diverging Beams (Laser Diodes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Collimated Beams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Focused Beams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Fiber Optic Cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Measuring or Setting the Wavelength . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Zeroing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Installing Fiber Optic Adapters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Chapter 3 Command Reference
Common Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Device-Dependent Commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Programming Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Chapter 4 Calibration
Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Warm-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Manual Operation User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Remote (GPIB) Operation User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Programming a Fixed Offset to Wavelength and Power Measurements . . . 21
Resetting the User Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Chapter 5 Troubleshooting
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

OMH-6727B 1
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CHAPTER 1
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INTRODUCTION AND SPECIFICATIONS
This manual contains operation and maintenance information for the OMH-6727B
InGaAs Power / Wave Head. The OMH-6727B may be used in conjunction with
either the OMM-6810B Optical Multimeter or the LWM-6500B Laser Wavelength
Meter. To get started immediately, first read Appendix B of the OMM-6810B
Instruction Manual.
Product Overview
The OMH-6727B InGaAs Power/WaveHead, when coupled to an OMM-6810B
Optical Multimeter, provides the capability to accurately measure the power and
wavelength of laser sources between 950 and 1650 nm. The OMH-6727B is
calibrated to NIST traceable power and wavelength standards to ensure accuracy.
The OMH-6727B can also be used with the LWM-6500B to measure wavelength
only.
Easy mounting, quick setup and alignment, and a two meter cable make the ILX
Lightwave Optical Measurement Head easy to integrate into an experiment. The
instrument can be integrated with other equipment via the optional GPIB/IEEE-
488.2 interface. The 6727B can also be used for fiber optic measurement
applications via an optional fiber optic adapter.
Safety Considerations
The high brightness, sometimes invisible light output of laser diodes and other
laser sources poses a definite eye hazard. Direct viewing of the laser output can
produce retinal or corneal damage. Absorption of the laser light by the eye
causes localized heating and denaturing of tissue proteins. The ANSI publication
Z-136.1, "The Safe Use of Lasers", lists Maximum Permissible Exposure (MPE)
levels for direct, or intrabeam viewing of laser beams. From the MPE levels, a
"hazard zone" may be computed for a particular laser and exposure time.

INTRODUCTION AND SPECIFICATIONS
Product Overview
2 OMH-6727B
CHAPTER 1
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For more information concerning lasers and laser diode safety, contact the Center
for Devices and Radiological Health or ILX Lightwave.
Refer Servicing only to qualified, authorized personnel.
Available Options and Accessories
The OMH-6727B must be coupled to the OMM-6810B Optical Multimeter.
Other options and accessories available with the OMM-6810B are listed in the
OMM-6810B manual.

INTRODUCTION AND SPECIFICATIONS
Specifications
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Specifications
Input Specifications
Power Measurement
Range 100 nW ~ 1 W2; -40 dBm ~ + 30 dBm2
Accuracy +3.5% (950 to 1500 nm)1,3
Wavelength Measurement
Range 950 to 1650 nm4
Accuracy + 1.0 nm
Temperature coefficient < + 0.03 nm / oC
Linearity with power change < + 0.5 nm
(Maximum change in measured wavelength due to power change)
Sampling Rate
Slow 16 samples @ 60 ms / sample
Medium 4 samples @ 60 ms / sample
Fast 1 sample @ 60 ms / sample
Input Bandwidth
Slow 1 Hz
Medium 10 Hz
Fast 60 Hz
Analog Output Specifications
Analog output representing the power measurement is available at the rear panel of the multimeter.
Refer to the OMM-6810B Instruction Manual for details.
Display
Left Display (Power)
Units
Linear Power
Log Power
pW, nW, µW, mW, W, ∆P
dBm, dB
Range
Linear Power
Log Power
0.000 nW to 999.999 W
-99.999 to 99.999 dBm / dB
Resolution (Slow Update Rate)
Linear Power
Log Power
0.001 pW
0.001 dB
Resolution (Medium / Fast Update Rate)
Linear Power
Log Power
0.01 pW
0.01 dB

INTRODUCTION AND SPECIFICATIONS
Specifications
4 OMH-6727B
CHAPTER 1
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1. Add + 0.5% from 1500 to 1630 nm.
2. Minimum optical power required for accurate wavelength measurement:
950 nm ~ 1200 nm
150 uW (-8.2 dBm)
1200 nm ~ 1630 nm
10 uW (-20 dBm)
3. MANUAL wavelength mode: Add +0.5% for automatic wavelength correction.
4. 1630 to 1650 nm: MANUAL wavelength mode only.
Our goal is to design and produce the best optical test equipment 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.
Right Display (Wavelength)
Units
Range
Resolution
nm, cm-1, ∆λ
500.0 to 1000.0 nm, 20,000 to 10,000 cm-1
.1 nm, .1 cm-1Right Display (Wavelength)
Bargraph Percent of full scale power
Brightness 5 settings
General Specifications
Operating Temperature + 15 oC to +35 oC
Storage Temperature -40 oC to +70 oC
Humidity (non-condensing) > 100 µW: <85% RH
<100 µW: <70% RH
Overall Dimensions 68.6 mm diameter x 30.1 mm
Weight < 0.5 kg
Input Port Diameter 6 mm
Input Type Integrating sphere
Optical Stand Accommodations 8/32 tapped hole centered
Fiber Optic Adapter FC, SC, ST
Connector to Main Unit 26 pin high-density sub-D

OMH-6727B 5
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CHAPTER 2
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OPERATION
This chapter describes how to install and operate the OMH-6727B InGaAs
Power/WaveHead in conjunction with a OMM-6810B Optical Multimeter. It is
divided into sections covering installation, power-up, front panel and rear panel
controls, and general operation. A detailed familiarization of the main unit
features are presented in Chapter 2 of the OMM-6810B Instruction Manual.
Installation
The OMH-6727B must be connected to the 6810B. Make sure the power to the
main unit is turned off and connect the cable from the 6727B to the INPUT
connector on the rear panel of the 6810B.
Do not attach or remove the Optical Measurement Head while power is applied to the
OMM-6810B. Please turn the power switch off when changing heads.
To avoid electrical shock hazard, connect the meter to a properly earth grounded, three
prong receptacle only. Failure to observe this precaution can result in severe
injury or death.

OPERATION
Power-Up
6 OMH-6727B
CHAPTER 2
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Power-Up
Connect the main unit to an AC power source. Press the POWER switch to
supply power to the device and start the power-up sequence.
The power-up sequence takes about six seconds. Initially, all LEDs and
enunciators are illuminated and the seven-segment displays denote "8". Then, all
LEDs and the displays are turned off while the microprocessor executes a device
self-test. Should the self test fail, error message E-720 is displayed. The Meter
then loads personality and calibration data from the measurement head. The left
display indicates -6727- and the firmware version is shown on the right display. If
an error occurs while loading data, message E-711 is displayed. If an
incompatible head is connected, error message E-713 is shown. If the
measurement head is not connected the display shows "------" until a
measurement head is attached.
At power up the main unit is configured to the same state that was present when
the power was last turned off.
Front Panel Controls
The OMM-6810B/OMH-6727B is intuitively operated from the front panel keypad,
indicator LEDs and dual displays. A drawing of the front panel is shown in Figure
2.1. Front panel functions which are not available with the OMH-6727B are
outlined later in this Chapter.
Refer to the OMM-6810B Instruction Manual for descriptions of each front panel
switch function.
Figure 2.1 OMM-6810B Front Panel