Olson Technology OTPT-300 User Manual

OTPT-300

LOW COST INDOOR

RETURN LASER TRANSMITTER

INSTRUCTION MANUAL

Phone:

E-Mail: [email protected]

025-370426 REV X3 12/29/02

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www.olsontech.com

TABLE OF CONTENTS

SPECIFICA TIONS Page 3

SAFETY WARNINGS Page 4

INTRODUCTION Page 5

INST ALLATION Page 5

Environmental Considerations Page 5

Optical Connectors and Cleaning Page 5

Installation Page 6

Internal Controls Page 7

External Controls and T est Points Page 7

ACCESSORIES Page 8

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OTPT -300 - Specifications For Use W ith DFB Laser

Reverse Frequency Range.................................................

Reverse Frequency Response...........................................

Input Return Loss................................................................

Return Laser Output Power................................................

Return Path NPR..................................................................

NPR 41dB Threshold...........................................................

T est Points............................................................................

Optical Connector................................................................

Weight...................................................................................

Dimensions...........................................................................

OTPT -300 - Specifications For Use W ith FP Laser

Reverse Frequency Range.................................................

Reverse Frequency Response...........................................

Input Return Loss................................................................

Return Laser Output Power................................................

Return Path NPR..................................................................

NPR 41dB Threshold...........................................................

T est Points............................................................................

Optical Connector................................................................

Weight...................................................................................

Dimensions...........................................................................

5MHz to 42MHz, or 5MHz to 65MHz
±1.0dB 5MHz to 42MHz or 5MHz to 65MHz
>16dB @ 5MHz to 42MHz or 5MHz to 65MHz
+3.0mW + 0.5mW
>15dB over 41dB NPR measured with 10dB fiber and Olson High
Sensitivity Return Band Receiver

-57dBmV/Hz
Laser Power 1V/mW
Laser Current 1V/50mA
SC/APC or FC/APC

0.5 lbs.
2 7/16” H x 11/16” W x 7 1/16” D - 6.25cm H x 1.8cm W x 18cm D

5MHz to 42MHz, or 5MHz to 65MHz
±1.0dB 5MHz to 42MHz or 5MHz to 65MHz
>16dB @ 5MHz to 42MHz or 5MHz to 65MHz
+1.6mW + 0.5mW
>15dB over 37dB NPR measured with 10dB fiber and Olson High
Sensitivity Return Band Receiver

-57dBmV/Hz
Laser Power 1V/mW
Laser Current 1V/50mA
SC/APC or FC/APC

0.5 lbs.
2 7/16” H x 11/16” W x 7 1/16” D - 6.25cm H x 1.8cm W x 18cm D

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SAFETY WARNINGS

LASER RADIATION

The OTPT -300 laser transmitter emits invisible radiation that can cause
permanent eye damage. A VOID DIRECT EXPOSURE T O BEAM.
Operate the transmitter only with the proper optical fiber installed in the

transmitter optical connector. Power to the OTPT-300 should be
turned-off or preferably , disconnected whenever the optical connector cover is opened and there is no installed fiber
(as when the fiber connector is being installed or removed from the transmitter connector).

NEVER USE ANY OPTICAL INSTRUMENT T O VIEW THE OUTPUT OF THE LASER
TRANSMITTER. “OPTICAL INSTRUMENT” INCLUDES MAGNIFYING GLASSES, etc.

NEVER LOOK INTO THE OUTPUT OF THE LASER TRANSMITTER.
NEVER LOOK INTO THE OUTPUT OF A FIBER CONNECTED TO A LASER

TRANSMITTER.

NEVER LOOK INTO OR USE ANY OPTICAL INSTRUMENT TO VIEW THE DIST ANT
END OF A FIBER THA T MAY BE CONNECTED DIRECTL Y OR VIA AN OPTICAL SPLIT ,
TO A TRANSMITTER THA T MA Y BE OPERATING. THIS SPECIFICALL Y APPLIES TO
FIBERS THA T ARE TO BE CONNECTED TO RECEIVERS (SUCH AS THE OTOR-300) OR
OTHER DEVICES A T ANY DIST ANCE FROM THE LASER TRANSMITTER.

HIGH VOL TAGE

The power supply section (bottom section) of the OTPN-1000 contains no user serviceable parts. There is

exposed high voltage inside this section. Only factory service technicians should open the power supply section.

FIRE HAZARD

The AC line input fuse is contained in the OTPN-1000 IEC power input connector. This fuse is a 3AG ,

0.5A, slow blow fuse. T o avoid a risk of fire, this fuse should be replaced only with an identically rated fuse.

SHOCK HAZARD

The OTPT -300 is designed for indoor use only . Direct exposure to moisture must be avoided.

025-370426 REV X3

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INTRODUCTION

The Olson T echnology OTPT -300 is a cost effective field installable return laser transmitter with an RF
passband of 5 to 70 MHz. The unit has a DFB laser with 3mW output (+4.8dBm) or a FP laser with 1.6mW
output (2.0dBm). This transmitter is intended only for indoor applications. This transmitter must be mounted to an
OTPN-1000 Piconode. It will not function as a standalone device. The diplex filter, test point, return OMI pad,
and AC power supply are part of the OTPN-1000. The actual return passband is determined by the diplex filter in
the OTPN-1000.

ENVIRONMENT AL CONSIDERATIONS

The OTPT -300 is specified to operate from -10°C to +55°C. It will probably not require an air­conditioned environment. It should be mounted in an adequately ventilated area. Like any other electronic
equipment, it will probably have a longer life span if it is not operated at the upper limit of the temperature range.
Installation in wet areas or areas of extremely high humidity should be avoided. Extremely dirty or dusty areas
should be avoided if possible. Objects or debris should not be allowed to block the openings in the OTPN-1000
housing or fan. The unit should not be installed in areas that are accessible to children.

OPTICAL CONNECTORS AND CLEANING

The standard optical connector is an SC/APC. In order to use FC/APC connectors, you must order a
conversion kit, OTLL-SCFCKIT . The standard optical connector location is on the opposite side from the RF
connector. The connector can be moved to the other side by swapping it with a cover plate. Only a screwdriver is
required for either operation.

Either of these operations must be done before the OTPT -300 is mounted to the OTPN-1000. Failure to
replace all of the OTPT -300 cover screws can cause RF ingress problems.

The fiber ends can be damaged by the insertion of contaminated connectors. Some types of customer
damage to connectors are not covered under warranty . Fiber connectors should never be left uncovered.
Prepackaged alcohol wipes are the most convenient means of cleaning optical connectors. Clean alcohol and lint
free wipes or swabs may also be used.

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INST ALLATION

1. If the OTPN-1000 is operational, REMOVE power from the OTPN-1000 before proceeding.

2. Remove the cover plate on the side of the OTPN-1000. Save the plate and screws in order to eliminate RF

ingress if the OTPT -300 should ever be removed.

3. Carefully push the OTPT -300 onto the side of the OTPN-1000. Clean the side of the OTPN-1000 with
alcohol if required. No heat sink gasket or compound is required between the OTPT -300 and the OTPN-

1000.

4. Firmly screw in the four mounting screws provided. If the original screws are missing, use 4-40x7/8” or
4-40x1” screws with lockwashers.

5. Apply power to the OTPN-1000.

6. Measure the OTPT -300 output power with an optical power meter and record the result.

7. Remove power from the OTPN-1000.

8. Clean the return fiber per your system standards and insert into the optical output connector .

9. Apply power to the OTPN-1000.

10. Measure the OTPT -300 laser power and laser current test points and record the results.

12. Remove the top cover from the OTPN-1000.

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12. The specification for the return band transmitter RF input level is -57dBmV/Hz (measured at the OTPN-1000

R.F . port). This value operates the system at the NPR threshold. The OTPN-1000 has a plug-in attenuator in
the reverse path. Also included is a -20dB test point in the return path. Note that the -20dB test point is before
the plug-in attenuator. The single carrier equivalent of -57dBmV/Hz is +9dBmV . The pad must be selected to
set the return carrier level to +9dBmV actual, after the attenuator . With a test carrier present at the port,
measure its level at the reverse -20dB test point. Use the actual level (test point +20dB) measured, to
determine what value of attenuator must be used to provide +9dBmV after the attenuator .

EXAMPLE: Test Point reading of +5dBmV plus -20dB test point equals +25dBmV minus +9dBmV equals

16dB pad required.

13. Firmly replace all OTPN-1000 top cover screws. Failure to do so can result in cooling, RF radiation, or RF

ingress problems.

INTERNAL CONTROLS

There are no internal user adjustments or test points in the OTPT -300. There is no user adjustable internal
laser power adjustment. Any change to the laser power will result in poorer modulation characteristics and reduced
link performance.

The return pad and return test point are located inside the OTPN-1000 as shown above.

EXTERNAL CONTROLS AND TEST POINTS

The OTPT -300 has 2 external DC test points. One reads laser current at 1V per 50mA. A typical laser
current of 25mA would read .5V at this test point. The laser power test point is 1V per mW . This is for historical
tracking. The optical power meter is a much more accurate means of measuring power . Both of these test points
should be measured with a high impedance voltmeter.

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