OWL Bolt Bedienungsanleitung
Operations Guide
Beaming Optical Length Tester (BOLT)
Optical Wavelength Laboratories (OWL)
N9623 West US Hwy 12
Whitewater, WI 53190
Phone: 262-473-0643
Internet: OWL-INC.COM
Date: July 26, 2004
Version 1.1
BOLT
Operations Guide
Beaming Optical Length Tester
Optical Wavelength Laboratories
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OWL
Unit 1 - Introduction
Description 1-1
General Features 1-1
Precautions 1-2
Required Accessories 1-2
Applications 1-2
Unit 2 - Operation
Fiber Length Measurement 2-1
Fiber Identification 2-1
Single-mode Light Source 2-2
Unit 3 - Appendices
Maintenance and Calibration Procedures 3-1
Specifications 3-1
Contact Information 3-1
Conversion Factors 3-2
Table of Contents
1.250
This manual describes the operation of the BOLT (Beaming Optical Length Tester). The BOLT is
designed to measure the length of single mode and multi-mode fibers in the infrared spectrum. It uses a
“round robin” technique for fiber measurement; i.e. it loops back two fibers in the same fiber cable with a
patch cord. The round trip time of the optical pulse is converted to kilometers, then divided by two to give
the length of the fiber cable. There is no need to measure the length of every fiber; the length will be the
same for all fibers in the cable, so this test only needs to be run once for each cable. This technique
allows the BOLT to be very accurate (up to ± 2.5 meters).
Many network cabling standards require the fiber cable length to be recorded along with attenuation
measurements. Optical measurement of fibers provides a quick and easy alternative to check the fiber jacket
for markings or estimating the length by using a measuring wheel, and often provides a greater degree of
accuracy.
The BOLT also includes a pulse mode feature for fiber location(when used with a fiber identifier), as well as a
continuous wave mode to be used as a stable -10 dBm single mode light source.
Description
1-1
Introduction
UNIT 1
1310NM FP LASER TRANSMITTER - this ST connector
port houses a laser diode that emits invisible light into an
optical fiber.
CONTINUOUS WAVE/TEST SELECTOR SWITCH -
this 3-way switch selects between OFF (center), length
testing / fiber identification mode (right), and continuous
wave / light source mode (left).
DETECTOR PORT - this ST connector port houses a
photodiode detector used to receive light from an optical
fiber.
POWER LED - this LED indicates that the tester is
powered on. During normal operation, if this LED is very
dim or is not lit, this indicates that the battery may not
have sufficient power for accurate testing, and should be
replaced.
LED DISPLAY - this 7-segment LED is used to display
the length of the fiber link in kilometers. If the display
shows all dashes, the BOLT is not receiving enough light
to make a measurement. This means that either the link
is either too long to be measured or there is a problem
with one of the fibers used for length measurement.
General Features
5
4
4
3
2
1
123
5
5
1-2
Introduction
UNIT 1
Precautions
Safety. Extreme caution must be exercised when operating the BOLT. It produces an intense beam of
invisible light that can cause permanent damage to the eye with prolonged exposure.
Operational. In order to insure accurate and reliable readings, it is vitally important to clean the ports on the
tester, as well as the ferrules on the patch cords, before each use. If dirt, dust, or oil are allowed to build up
inside the connector, the surface of the laser diode may become scratched, producing erroneous results.
Replace the dust caps on the tester ports and patch cords when not in use.
NEVER LOOK INTO A LIGHT SOURCE OR THE END OF A FIBER THAT MAY BE ENERGIZED BY A
SOURCE!
Required Accessories
Cleaning Supplies. Fiber ferrules, connector ports and bulkheads should be cleaned with 99% or better
isopropyl alcohol and a lint-free cloth. A can of compressed air should be available to dry off the ferrules, and
to blow dust from the connector ports and bulkheads.
Patch Cords. Two identical patch cords are required to connect the BOLT to the system under test, and an
additional patch cord is required to loop back the two fibers being used for the test. The connector styles on
the patch cords must match the type on the BOLT and the type of the bulkheads in the system under test.
Applications
Fiber Length Measurement. The BOLT uses a “round robin” method of length measurement. This method
requires two fibers from the same fiber cable to be looped back at one end with a patch cord. Light is injected
into one of the fibers by the transmitter and is received by the detector connected to the other fiber. The round
trip travel time is converted into length in kilometers and divided by two to arrive at the length of the fiber cable.
It is not necessary to test each fiber for length; the length measurement applies to all fibers in the cable.
Fiber Identification. The BOLT provides a pulsed mode for easy fiber identification. Fibers are identified by
clamping a fiber identifier onto a jacketed fiber, which produces a tone to indicate presence of a signal. This is
useful for locating fibers that are marked incorrectly or not marked at all.
Stabilized Single-mode Light Source. In Continuous Wave Mode, a steady beam of 1310 nm infrared laser
light is injected into the fiber. This light is stabilized at -10 dBm, and when used with a power meter, functions
as a single-mode light source for fiber attenuation testing.
Operation
UNIT 2
Fiber Length Measurement
1 - On one end of the fiber cable, loop back two of the
fibers with one of the patch cords.
2 - On the other end of the fiber cable, connect one patch
cord to each of the fibers being used for the test.
Connect the other end of the patch cords to the
receiver and transmitter ports on the BOLT. It does not
matter which patch cord connects to which fiber.
3 - Power on the BOLT into length test mode by flipping
the switch to TEST. In a few seconds, the display will
show the length of the fiber in kilometers. In the
example at right, the link is 1.250 kilometers.
NOTE: If the green indicator LED does not light up, this
means that the battery power insufficient for a valid test.
The battery must be replaced before continuing.
Fiber Identification
1 - Connect the BOLT to the fiber you are testing via a
patch cord as shown at right.
2 - Power on the BOLT into fiber identification mode by
flipping the switch to TEST. This mode emits a flashing
beam of invisible light into the fiber.
3 - Identify the fiber by clamping a fiber identifier to the
fibers until you locate the fiber being tested. Many
identifiers produce an audible tone.
Fiber Length Measurement
1.250 Patch
Cords
Fiber
Link
2-1
- - - - Patch
Cord
Fiber
Link
Fiber Identification
Beware of invisible
optical radiation!
Add Clip On
Identifier
Operation
UNIT 2
Single-mode Light Source
1 - Connect the BOLT to the fiber you are testing via a
patch cord as shown at right.
2 - Connect a power meter (such as the Fiber OWL) to
the other end of thefiber you are testing via a patch cord
as shown at right.
3 - Power on the BOLT to continuous wave / light source
mode by flipping the switch to CW. Allow the BOLT to
stabilize for 2 minutes before taking measurements with
the power meter.
2-2
Patch
Cord
Fiber
Link
Single-mode Light Source
To power
meter
Appendices
UNIT 3
3-1
Maintenance and Calibration Procedures
Specifications
Contact Information
Repair. Repair of this unit by unauthorized personnel is prohibited, and will void any warranty associated with
the unit.
Battery Replacement. The battery compartment is covered by a sliding plate on the back of the unit. One 9v
battery is required for operation.
Cleaning. For accurate readings, the optical connectors on the BOLT and the connectors on the patch cords
should be cleaned prior to attaching them to one another. Minimize dust and dirt buildup by replacing the dust
caps after each use.
Re-calibration. It is recommended to re-calibrate the BOLT every 12 months to maintain the light source
stability at -10 dBm.
Warranty. The BOLT comes standard with a one-year factory warranty, which covers manufacturer defects
and workmanship only.
Address:
Optical Wavelength Laboratories
N9623 Hwy 12
Whitewater, WI 53190
Phone:
(262) 473-0643
Internet:
OWL-INC.COM
Launch Method:
Output Power (62.5 µm core):
Resolution:
Accuracy:
Measurement Range:
Battery Life:
Operating Temperature:
Storage Temperature:
Low Battery Indicator:
Connector Style:
Width:
Height:
Depth:
Weight (with battery):
FP Laser
0.1 milliwatts
up to 0.001 kilometers
± 2.5 meters
25 kilometers
10 hours
0 to 55° C
0 to 75° C
Yes
ST
2.75 inches
4.94 inches
1.28 inches
154 grams
1 kilometer
1 kilometer
1 kilometer
1000 meters
0.6214 miles
3281 feet
Distance in Kilometers
1.250
Here are some examples of converting the BOLT display into different units of
measurement. For these examples, let us assume a fiber length of 1.25
kilometers as shown by the display at right.
kilometers to meters
1.250 x 1000 meters = 1250 meters
kilometers to miles
1.250 x 0.6214 miles = 0.777 miles
kilometers to feet
1.250 x 3281 feet = 4101.25 feet
Appendices
UNIT 3
3-2
Conversion Factors
The BOLT displays fiber length in kilometers. At times it may be necessary to convert the fiber length to a
different unit of measurement. The table below provides conversion factors for various units of
measurement.
To calculate the units you need, multiply the number on the BOLT display by the conversion factor listed in the
table below:
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