Olson Technology MUSCLE-1000C User Manual

OTOT-1000C & OTOT-1000E

WIDE-BAND LOW-COST OPTICAL TRANSMITTERS

1,000MHz BANDWIDTH

OPTICAL OUTPUT POWER FROM

+3dBm (OTOT-1000C-3) to +15dBm (OTOT-1000C-15)

INSTRUCTION MANUAL

Phone: [phone]

[phone]

Fax: [phone]

025-000554 Rev X8

E-Mail: [email protected]

www.olsontech.com

08/17/10

SAFETY WARNINGS

LASER RADIATION

The OTOT-1000C laser transmitter emits invisible radiation that can cause permanent
eye damage. . Operate the transmitter only
with the proper optical fiber installed in the transmitter optical connector. The OTOT­1000C should be turned-off or 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 thetransmitterconnector).

NEVER

LASER TRANSMITTER. “OPTICAL INSTRUMENT” INCLUDES MAGNIFYING
GLASSES, ETC.

NEVER

NEVER

TRANSMITTER.

NEVER

DISTANT END OF A FIBER THAT MAY BE CONNECTED DIRECTLY OR VIAAN
OPTICAL SPLIT, TO A TRANSMITTER THAT MAY BE OPERATING. THIS
SPECIFICALLY APPLIES TO FIBERS THAT ARE TO BE CONNECTED TO
RECEIVERS (SUCH AS THE OTPN-400C or OTPN-2000C) OR OTHER
DEVICESATANY DISTANCEFROMTHELASER TRANSMITTER.

HIGH VOLTAGE

There is exposed high voltage inside this unit. Only factory service technicians should
open the unitwithpowerapplied.

FIRE HAZARD

connector.Thisfuseisa250V,0.5A,5x20mm,slowblowfuse.Toavoidariskof fire, this
fuse should bereplaced onlywith an identicallyrated fuse.

SHOCK HAZARD

to moisture mustbe avoided.

AVOID DIRECT EXPOSURE TO BEAM

USE ANY OPTICAL INSTRUMENT TO VIEW THE OUTPUT OF THE

LOOK INTO THE OUTPUT OF THE LASER TRANSMITTER

LOOK INTO THE OUTPUT OF A FIBER CONNECTED TO A LASER

LOOK INTO OR USE ANY OPTICAL INSTRUMENT TO VIEW THE

- The inside of the OTOT-1000C contains no user serviceable parts.

- The AC line input fuse is contained in the IEC 320 power input

- TheOTOT-1000C isdesigned for indooruse only. Direct exposure

INTRODUCTION

The Olson Technology OTOT-1000C is a high performance indoor wideband laser
transmitter with an RF passband of 48 to 1,000MHz. The OTOT-1000C also offers
enhanced CATV performance. These transmitters are intended forindoor applications.
They combine the transmitter and universal AC power supply in one compact housing
that hasa footprint of 6.5" x5.5" x 1.4”. The optical output powerand bandwidth of each
transmitter is asfollows:

OTOT-1000C-3 +3dBm (2mW) OpticalOutput Power
OTOT-1000C-6 +6dBm
OTOT-1000C-8 +8dBm
OTOT-1000C-9 +9dBm
OTOT-1000C-10 +10dBm
OTOT-1000C-12 +12dBm
OTOT-1000C-13 +13dBm
OTOT-1000C-14 +14dBm
OTOT-1000C-15 +15dBm

(4mW) Optical OutputPower
(6mW) Optical OutputPower
(8mW) Optical OutputPower

(10mW) Optical OutputPower
(16mW) Optical OutputPower
(20mW) Optical OutputPower
(25mW) Optical OutputPower

(31mW) Optical OutputPower
The transmitter has an internal universal power supply that operates from 90 to 240V
at 50 or60 Hzand consumes about10 Watts.
The OTOT-1000C is an ideal forward signal source for the OTPN-2000C High
Sensitivity Indoor Node and will allow for an optical path loss of 21dB or more. Test
points are provided for laser output power and current to allow for historical review of
operating parameters. An RF test point is provided to allow proper setup and for
historical review. Positive cooling is provided by means of a small, high-MTBF fan,
which may be replaced in the field without interrupting the operation of the unit. The
OTOT-1000C has flanges on the bottom to allow mounting it to a flat surface. The
available OTLL-RMKIT-1 will allow mountingup tothree of these units in a standard19"
rack.

INSTALLATION/ ENVIRONMENTALCONSIDERATIONS

The OTOT-1000C transmitters are specified to operate from -10°C to +55°C. They
usually do not require an air-conditioned environment. They should be mounted in an
adequately ventilated area. Like all electronic equipment, it will generally have a

longer
life span if it isnot operatedat the upper limit ofthe temperaturerange. Installation in wet
areas or areas of extremely high humidity should be avoided. Extremely dirty or dusty

AC

areas should be avoided ifpossible. Objectsor debrisshould notbe allowed to block the
openings in the housing or the fan. The unit should not be installed in areas that are
accessible to children.
The OTOT-1000C may be installed and operated in any position on a flat surface. The
unit has four slots in the bottom plate to accommodate mounting hardware. If mounting
requires a wood screw, use #6 or #8 (maximum) pan-head sheet metal screws. These
are commonly available at hardware stores. If mounting with a machine screw (to
tapped holes), use6-32 pan-headscrews.

Figure1-OTOT-1000C-xx Mounting Diagram

OPTICAL CONNECTORS AND CLEANING

The standard optical connector isan SC/APC. Inorder to use FC/APC connectors, you
must order aconversion 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 this operation.
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. Pre-packaged alcohol wipes are the most
convenient means of cleaning optical connectors. Clean alcohol and lint free wipes,
such as Kim-Wipetype 34155,or swabs mayalso beused.

INTERNAL CONTROLS

There are no internal user adjustments. The only reason to open the unit would be to
move the fiber connector to the other end of the unit.This shouldbe donebefore theunit
is attached to a rack mount kit. The unit shouldnot be operated for long periods of time
without a top cover. This can cause RF radiation and ingress problems. The internal
cooling is also reduced when uncovered. Be sure to replace and tighten all top cover
screws. Oscillation or RF radiation canbe caused by loose or missing screws. There is
no user adjustable internal laser power adjustment. Any change to the laser power will
result in poorermodulation characteristicsand reduced linkperformance.

EXTERNAL CONTROLS AND TEST POINTS

There are two external DC test points. One reads laser current at 1V per 50mA.Atypical
laser current of 30mA would read 0.6V at this test point. The laser power test point is

0.1V per mW. This is for historical tracking. The optical power meter is a much more
accurate means of measuring power.Both ofthese testpoints shouldbe measured with
a high impedancevoltmeter.
There is an external multi-turnRF inputattenuation controlon the frontpanel. This is set
at thefactory tothe fully clockwise position which yieldsminimum attenuation.The user
can add 4dB of attenuation with this control which allows the input RF level to be up to
4dB higher than the recommended levels. There is an external 75Ω RF test point.

also
This test point measures the laser drive level, not the RF input level. This test point has
been adjusted to read a very specific level when the RF drive has been adjusted for
optimum optical modulation. For the factory tested input loading of 77 analog and 42
digital channels, this test point should read +10dBmV at 547.25MHz with the RF gain
control pot is fully clockwise.At this frequency, theloss in theconnecting cable andany

impedance matching devices can be very significant. See the section on input loading
for the propertest pointlevels with otherinput conditions.

INITIAL SETUP

Mount the unit and apply power. The laser is temperature controlled. The unit will
operate immediately afterturn on,but requires about 5minutes totemperature stabilize.
Measure and record the optical output with a power meter. Measure and record the
laser current andoptical powerreadings atthe externaltest points.Measure andrecord
the RF input levels. At this frequency range the loss and slope of coax

CAUTION:

cables is very significant. The best approach is to connect the cable that will go to the
OTOT-1000 input directlyto themeasurement device. The input signals should be flat

C

within ±1dB,preferably within±0.5dB. Responsesworse than this will result in reduced

NR

C and or distortionperformance.

Special attention must be paid to the relative level of the channel that is used to set the
RF gain and thus set the laser modulation. Ifthis channel is much higher than the other
channels, then setting the RF gain will cause the other channels to be lower than
optimum, resultingin reduced CNRperformance. If this channel is too low,then using it
to set the RF gain will cause the otherchannels to be higherthan optimum, resulting in
reduced distortion performance. A 1 to 2dB error will cause significantly impaired

dB
performance. Connect the RF input to the unit and adjust the RF gain control for a level
that indicates proper modulation. For the factory test condition, this is +10dBmV at

547.25MHz. For other channel loadings, consult the next section. Do not forget to
account for theloss inthe connecting cable.

INPUT DRIVE vs. CHANNEL LOADING

The laser RF drive level is the primary determining factor of link distortion and CNR
performance. The basiclimitation oninput driveis totalinput power. The following charts
show the approximate input levels versus channel loading. The left axis shows the
nominal RFinput level. The unit will work with levelswithin ±2dB of this value. The right
axis shows the test point reading for optimum modulation. Figure 2 is for the OTOT­1000C-3 andOTOT-1000C-6models. Figure 3 is for all other optical powerlevels. Most
systems run their digital channels at 6dB below the analog channels. This is a very
convenient level for calculating loading.At 6dB down, simplydivide thenumber of digital
channels by 4 and add to the number of analog channels to get the total equivalent

analog channel loading. The factory test input is 77 analog channels with 42 digital
channels at 6dB down. The number of equivalent analog channels is 77 + 42/4, which
equals 87.5. This is the 87.5 ch / +17.6dBmV input point on the graph. Some systems
use an OMI meter to set laser modulation. The OTOT-1000C’s have been individually
adjusted for optimum performance. Setting all units for the same OMI, instead of using
the test point, will result in reduced transmitter performance. If the channel loading is
less than 40, you may decide not to increase the levels by the maximum possible
amount. This willprovide improved distortion at thecost of CNR. The best rule ofthumb
is to use the maximum possible levels for long haul links, and lower drive levels as the
links get shorter.

REDUCING LINK GAIN

Short links can have reduced performance due to receiver overloading. Reducing the
laser RF drive will cause reduced CNR performance. Attempting to lower the laser
output power will have the even worse result of degrading both CNR and IMD. The
correct solutionis to lower the receiver input level withan optical attenuator such asthe
OTOA-1000. It isrecommended that this bedone atthe receive location.

Figure 2 - Input Level vs. Channel Loading - Low-Power Units

Figure 3 - Input Level vs. Channel Loading - High-Power Units

ACCESSORIES

MODEL DESCRIPTION

OTLL-SCFCKIT Optical Connector Adapter Kit, SC/APCto FC/APC
OTLL-RMKIT-1 Rack Mount Kit(Holds 3OTOT-1000C’s)
OTOA-1000 Optical Fiber Attenuator,1310nm, 1-7dB Variable Steps
OTLL-FANKIT Replacement Fan Assembly

RELATED OLSON TECHNOLOGY PRODUCTS

MODEL DESCRIPTION

OTPN-800C Wideband (50-1,000MHz) Medium-PowerIndoor Node
OTPN-2000C Wideband (50-1,000MHz) High-PowerIndoor Node
OTPN-2000C-PAL Wideband (85-1,000MHz)High-Power Indoor Node