Olson Technology LP-DC-X User Manual

LP-DC212
LP-DC234

LASER PLUS 4 BAND BLOCK DOWNCONVERTER SYSTEM

INSTRUCTION MANUAL

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E-Mail: [e-mail]

025-370447 REV X2 11/5/02

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Fax:

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www.olsontech.com

TABLE OF CONTENTS

LASER W ARNING Page 3

SPECIFICA TIONS Page 4

OVERVIEW Page 5

INST ALLATION Page 6

Optical Connectors and Cleaning Page 6

Installation in Chassis Page 7

Removal from Chassis Page 7

LP-DC-212 Setup Page 8

LP-DC-234 Setup Page 9

TROUBLE SHOOTING Page 10

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SAFETY WARNINGS

LASER RADIATION

Laser transmitters emit invisible radiation that can cause permanent eye
damage. AVOID DIRECT EXPOSURE TO BEAM. Operate only
with the proper optical fiber installed in the transmitter optical connector .

The laser transmitter should be disabled with the front panel switch whenever the optical connector is empty .
NEVER look into the end of a fiber optic cable, even at the LP-DC212 optical input.

HIGH VOLTAGE

The Laser Plus power supply contains no user serviceable parts. There is exposed high voltage inside the

supply . The power supply housing should be opened only by factory service technicians.

FIRE HAZARD

The Laser Plus rear power supply fuse is a 3AG , 3.25A, slow blow fuse. T o avoid a risk of fire, this fuse

should be replaced only with an identically rated fuse.

The Laser Plus main chassis is not intended as a shipping container . Shipping the chassis with any module

installed can cause severe physical damage.

SHIPPING ALERT

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SPECIFICATIONS

Input Frequency Range...................................................

Optical Input Range........................................................

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

Down Converter Response.............................................

RF Output and T est Connectors......................................

Rear Interconnections.....................................................

Output Level (6 carriers).................................................

Output Frequency Range.................................................

Output Return Loss.........................................................

Output Frequency Accuracy............................................

Pilot Frequency ...............................................................

Phase Noise....................................................................

Noise Power Ratio (NPR)..............................................

3rd Order Distortion.........................................................

(U/C input: 6 CXRs @ +15dBmV)

2nd Order Distortion........................................................

(U/C input: 6 CXRs @ +15dBmV)

Power Requirements.......................................................

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

Operating T emperature....................................................

Humidity..........................................................................

5MHz to 206.5MHz
Band 1: 5MHz to 42MHz
Band 2: 51.5MHz to 88.5MHz
Band 3: 121.5MHz to 158.5MHz
Band 4: 169.5MHz to 206.5MHz

-10dBm to 0dBm
SC/APC (standard)
FC/APC (optional)
5-42MHz: ±1.5dB
7-40MHz: ±1.0dB
75Ω T ype F

4.5MHz pilot, RF: 75Ω T ype SMB
+35dBmV per carrier
4 outputs of 5-42MHz
>15dB
Phase locked to input via pilot carrier

4.5MHz ± 150Hz
<-110dBC/Hz @ 10KHz
>14dB range @ 40dB threshold (Measured with all
bands loaded, 3mW OT DFB laser into 10dB of fiber .)
<-55dBC

<-55dBC

LP-DC212: 5.2V @ 1.25A
LP-DC234: 5.2V @ 0.9A
Laser Plus Chassis
LP-DC212: 1 Slot
LP-DC234: 1 Slot
0°C to 45°C
<95%, non-condensing

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OVERVIEW

5

The LP-DC212 and LP-DC234 are the receive sections of a return spectrum multiplier system. They can
double or quadruple the bandwidth of any optical return link. The LP-DC212 by itself can function as a bandwidth
doubler . Both units together will quadruple the return bandwidth. The LP-DC234 requires an LP-DC212 in order
to function. All outputs are phase locked to their inputs, providing transparent operation.

The units plug into an Olson T echnology high density Laser Plus chassis. Each unit occupies one slot. The
following diagram shows the overall system.

System Overview

5-42MHz
5-42MHz
5-42MHz

5-42MHz

FRMUC, RSMII, or

other Olson Techno l ogy

Spectrum Multiplier

Band 1
Band 2

Band 3
Band 4

Laser

Optical Fiber

Full Spectrum

Rear Outputs

5-42MHz

Band 1 Band 3

Photo­diode

Olson Technology

5-42MHz

Spectrum

4.5MHz
Pilot

LP-DC212

Full

Rear Outputs

5-42MHz5-42MHz

Band 2 Band 4

Rear
Interconnect

Olson Technolo gy

LP-DC234

The next diagram shows the full RF spectrum as it is at both ends of the optical link. Some local oscillator presence
is normal. It will not cause in-band distortion products or degrade NPR.

Return Path Spectrum

4.5MHz
Pilot

Band 1

5.0-

42.0MHz

Band 2

51.5-

88.5MHz

Band 2

L.O.

Band 3

121.5-

158.5MHz

Band 3

L.O.

Band 4

L.O.

Band 4

169.5-

206.5MHz

0 25 50 75 100 125 150 175 200 22

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The next picture is a block diagram of the LP-DC212. This unit contains the optical receiver and the band 3

.

.

.

.

converter. It also contains the 4.5MHz pilot extraction circuitry , which is used for AGC and phase lock. It supplies
the pilot and the full RF input spectrum to the LP-DC234.

Rear Panel
Full Spectrum
to LP-DC234

Fiber Input

Front Panel
T.P. 1V/mW

Front Panel
AGC T.P.

Rear 4.5MHz
to LP-DC 234

Optical
Receiver

LP-DC212 Block Diagram

AGC

4.5 MHz / AGC

VCXO

Analog & Digital Status Monitoring

Amp
Filter

Converter

Front Panel
Full Spectrum

-20dB T.P.
Rear Panel

Band 1 Output

Front Panel
Band 1 -20dB T.P

Rear Panel
Band 3 Output

Front Panel
Band 3 -20dB T.P

The next picture is a block diagram of the LP-DC234. This unit contains the band 2 and band 4
converters. This unit does not have an optical receiver and is not a self-contained unit. It must be connected to a
LP-DC212 to function.

LP-DC234 Block Diagram

Rear Panel
Full Spectrum
from LP-DC212

Rear 4. 5MHz
from LP-DC212

VCXO

VCXO

Digital Status Monitoring

Converter

Converter

Rear Panel
Band 2 Output

Front Panel
Band 2 -20dB T.P

Rear Panel
Band 4 Output

Front Panel
Band 4 -20dB T.P

INSTALLATION

OPTICAL CONNECTORS AND CLEANING

The standard optical connector is an SC/APC. The fiber ends can be damaged by the insertion of
contaminated connectors. Some types of customer damage to connectors or fiber are not covered under warranty .
Fiber connectors should never be left uncovered. Reel cleaners or 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 ALLA TION IN CHASSIS

The Laser Plus main chassis should be rack mounted before the modules are installed. This chassis should
never be used as a shipping container. The modules should be gently slid into the chassis. T o avoid damage to the
internconnect cables, install the LP-DC’s from the right to the left, as shown below . The LP-DC212 should always
be to the left of the LP-DC234 in which it is connected to. Connect the rear SMB cables.

Note that while the main chassis slots are numbered from the left on the front, they are numbered from the
right on the rear. This could cause confusion relating to which LP-DC212 is connected to which LP-DC234.

Measure the incoming optical level with a power meter before connecting the fiber . The test point readings
should be recorded for historical reference. The following chart shows the test point readings versus optical input
levels.

T.P. Volts Optical Input mW Optical Input dBm

3.02 3.02 4.8

2.51 2.51 4
22 3

1.58 1.58 2

1.26 1.26 1
11 0

0.79 0.79 -1

0.63 0.63 -2

0.5 0.5 -3

0.4 0.4 -4

0.32 0.32 -5

0.25 0.25 -6

0.2 0.2 -7

0.16 0.16 -8

0.13 0.13 -9

0.1 0.1 -10

0.08 0.08 -1 1

0.06 0.06 -12

0.05 0.05 -13

REMOVAL FROM CHASSIS

If possible, turn the source laser off. Always put a dust cover over the optical connector. NEVER look

into the end of the fiber .

Disconnect the rear panel SMB cables before removing the modules. Pull each module slightly forward

with the handle until it hits the stop. Lift the front end of the module and remove it. Never use the optical
connector as a handle.

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LP-DC212

FRONT P ANEL

The standard optical input connector is type SC/APC.

There are 3 front panel –20dB RF test points. The receiver T .P. depicts the full
spectrum RF output from the optical receiver . The other 2 test points reflect the rear
panel sub-band outputs. T ypical 4.5MHz pilot levels are +14dBmV at the RX T .P. and
+10dBmV at the band 1 T .P. There is no pilot at the band 3 T .P.

For level setting, the accuracy of these band 1 and band 3 test points is ± 1dB.

The power LED should always be on and green. The alarm LED is always on.
It is green unless a failure occurs. It monitors optical input levels, RF AGC, and VCXO
unlock.

The DC test points should be used with a high impedance meter . The optical
input T .P . is calibrated for 1V/mW @ 1310 nm. A correction factor must be applied for
other wavelengths.

The AGC test point reflects the strength of the 4.5MHz pilot signal. A higher
voltage indicates less signal.

LP-DC-212

BAND 1
T.P.

RECEIVER
T.P.

POWER ON

ALARM

GND.

BAND 3
T.P.

REAR P ANEL

The rear panel has the 2 RF F output connectors and the 2 SMB connectors that
connect to the LP-DC234. T ypical pilot levels are +50dBmV at the pilot connector and
+32dBmV at the RF connector .

FUSE

The module has an internal miniature 3A SB fuse in a holder . The Littelfuse part
number is 0454003. The Olson T echnology P/N is 286-000009.

AGC

OPTICAL
POWER

OPTICAL
INPUT

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LP-DC234

FRONT P ANEL

There are 2 front panel –20dB RF test points. For level setting, the accuracy of
these band 2 and band 4 test points is ± 1dB. No 4.5 MHz pilot is present at these test
points.

The power LED should always be on and green. The alarm LED is always on.
It is green unless a failure occurs. It monitors VCXO unlock.

REAR P ANEL

The rear panel has the 2 RF F output connectors and the 2 SMB connectors that
connect to the LP-DC212.

FUSE

The module has an internal miniature 3A SB fuse in a holder . The Littelfuse part
number is 0454003. The Olson T echnology P/N is 286-000009.

LP-DC-234

POWER ON

ALARM

BAND

T.P.

BAND

T.P.

2

4

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TROUBLESHOOTING

This is a complex system and troubleshooting requires some thought.

The primary problems at turn on are poor optical connections due to contamination and reversed or
incorrectly connected cables. Confusion between the main chassis slot numbering convention from front to rear is
not uncommon.

Intermittent operational problems are probably due to laser transmitter overload. This can be due to RF
ingress. It could also be because the up converter input levels are too high. This problem tends to be much worse
during periods of high system usage.

Problems may also be caused by damaged SMB connectors at both the transmit and receive ends. Always
remove these connectors with care. Never pull on the cable or exert torque on the connector.

The band one transmitter input has a 4.5 MHz trap. Excessive 4.5MHz signals at this input can interfere
with both receiver AGC and phase lock. This problem normally appears when bench testing the units, not during
normal operation. Another 4.5MHz trap in the band 1 input will fix this problem during sweeping or NPR testing.

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