24926 Highway 108
Sierra Village, CA 95346
Phone: (800) 545-1022
Fax: (209) 586-1026
E-Mail: sales @olsontech.com
External Modulation 1550nm CATV Optical Transmitter
High-Performance Model OTOT-EM55XL
Features and Benefits
High performance externally
modulated 1550nm DFB laser
CATV transmitter.
Low noise, narrow linewidth CW-
DFB laser. DWDM ITU grid wave-
length is adjustable to ± 100GHz
via front panel.
Adjustable SBS threshold from
+13dBm to +19dBm on 0.1dB
steps increases system flexibility.
Dual, hot plug-in power supplies
available for high reliability; 100 to
240V
AC
or ± 36 to ±72 V
DC
.
LCD display, LED status indication,
and front panel -20dB front panel
RF test point aide in set-up and
operation.
Electro-optical modulator offers
dual +6dBm optical outputs.
Automatic RF gain control: CW,
video, and manual modes.
Sophisticated web and SNMP
interface control and monitoring.
General purpose I/O interface for
remote functions.
Housed in a 1RU 19" rack-mount
enclosure for use in standard
equipment racks.
SC/APC optical connector stan-
dard. FC/APC optional.
The high performance Olson Model OTOT-EM55XL
1550nm Externally Modulated CATV Optical Transmitter
uses a low-noise, narrow bandwidth, CW laser as a light
source. The external modulator amplitude modulates the
light, allowing the transmitter to eliminate the chirp
associated with 1550nm direct modulation lasers. It is
deal for CATV supertrunk links (100km & more) and
multipoint distribution networks. The OTOT-EM55XL
provides state-of-the-art bandwidth from 47MHz to
1,000MHz. It also offers superb stability over the full
operating temperature range from 0°C to +50°C.
Direct modulation 1550nm CATV transmitters suffer from
the effects of dispersion that can occur even in modest
length fiber runs (10-20km). The key degradation is CSO
caused by the laser chirp. In networks using an EDFA, the
output fiber optical launch power must also be closely
regulated to avoid performance degradation of due to
SBS. Olson’s Externally Modulated CATV transmitter can
compensate for these types of distortion, allowing for
high quality signal transmission of multiple CATV chan-
nels for distances up to 100km or more.
The widely adjustable SBS value on the XL version further
increases the transmitter's flexibility, allowing the net-
work to be optimized for a wide range of fiber lengths. The
unique ability of the OTOT-EM55XL to tune to several
different DWDM channels simplifies logistics by alloing
one spare to cover multiple installed units.
The transmitter is enclosed in a 19" wide, 1RU rack
chassis for using in a standard EIA 19" rack. Front panel
controls and a LCD display allow the user to quickly
monitor and control system parameters. Optical connec-
tors are SC/APC standard, with an option for FC/APC
connectors. Single or Dual AC and DC power supply
options are available.
www.olsontech.com
Rev X2
All Specifications Subject to Change Without Notice
Dec. 2007
CATV Transmitter
System Specifications
General Characteristics
(with SM 9/125µm Fiber)
Laser Wavelength
(ch. 22-46)
Optical Connector
Min
1540
Typ
ITU Grid
SC/APC
FC/APC
>30
<-160
20
-20
Max Units
1560
nm
Optical and RF Performance
(with SM 9/125µm Fiber)
Laser Wavelength
(ch. 23-38)
Wavelength Adjust (50 GHz steps) -100
Laser Linewidth
Optical Output Power (dual)
+5.0
SBS Suppression (adj 0.1dB Steps) +13
RF Frequency Range
Flatness (47-860MHz)
Flatness (860-1000MHz)
Version
Channel Plan
Number of Channels
TV/FM (-4dB) /QAM64 (-10dB)
Noise Bandwidth
CNR Tx/Rx
CNR Link 1
CNR Link 2
CNR Link 3
CSO Tx/Rx and Link 1
CSO Link 2
CSO Link 3 at output #1
CTB
Version
Channel Plan
Number of Channels
TV/FM (-4dB) /QAM64 (-10dB)
Noise Bandwidth
CNR Tx/Rx
CNR Link 1
CNR Link 2
CNR Link 3
CSO Tx/Rx and Link 1
CSO Link 2
CSO Link 3 at output #1
CTB
47
<±0.75
<±1.5
PAL84
PAL-D
84/0/0
5
52.5
52.0
50.5
49
65
65
63
65
N77
NTSC
77/0/0
4
53.5
53.0
52.0
50.0
65
65
65
65
Min
1547
Typ
ITU Grid
+100
0.3
+6.0
+7.0
+19
1000
GHz
MHz
dBm
dBm
MHz
dB
MHz
Max Units
1560
nm
Side Mode Suppression
Relative Intensity Noise
<-158
Nom. Input Level per Tx Ch.
RF Monitor Output Level
(+0.2 to -0.8dB @ 862 MHz;
-1.3dB @ 1GHz)
AGC Dynamic Range
-6
+3
Impedance (F-female)
75
Return Loss (47 MHz, -1.5dB/oct.) >15
>20
Control Interface
Ethernet 10/100
dB
dBc/Hz
dBmV
dB
dB
Ohm
dB
MB/s
Physical Characteristics
Min
Weight
Dimensions (W x L x H)
Typ
Max Units
21.4
lbs.
9.7
kg
19 x 11 x 1.75
in.
482.6 x 279.4 x 44.5
mm
MHz
dB
dB
dB
dB
dBc
dBc
dBc
dBc
Electrical and Environmental Characteristics
Power Supply Voltage
Power Supply Voltage
Power Consumption (110V
AC
)
Power Consumption (48V
DC
)
Operating Temp. Range
Storage Temp. Range
Humidity
Min
100
±36
Typ
Max Units
240
V
AC
±72
V
DC
W
+50
+85
85
°C
°C
%
<50
<50
0
-20
20
EMI meets EN50083-2 (April 1996) and EN50083-2/A1 (February 1998).
MHz
dB
dB
dB
dB
dBc
dBc
dBc
dBc
www.olsontech.com
Rev X2
2
Dec. 2007
CATV Transmitter
Test Configurations
Booster EDFA
First Fiber Length
In-Line EDFA
Second Fiber Length
Rx
Tx/Rx
No
No
No
No
0dBm
Link 1
No
35km
No
No
0dBm
Link 2
16dBm
65km
No
No
0dBm
Link 3
13dBm
52km
13dBm
52km
0dBm
NOTES: 1) Rx with 7pA/Hz Input Noise Current Density
2) EDFA’s with 5dB Noise Figure
3) RF Input Level at 20dBm/Channel
Ordering Information
Freq. Plan Opt. Conn. RF Conn. Power Supp.
XX
OTOT-EM55 XL (See Below) (See Below) (See Below) (See Below) (ITU Ch.)
Frequency Plans
N = NTSC 77 Chan
P = PAL 84 Chan
Optical Connector
SA = SC/APC
FA = FC/APC
RF Connector Location
F = On Front Side
R = On Rear Side
Power Supply
AC/AC = 2x (100 to 240V
AC
)
DC/DC = 2x (±36 to ±72 V
DC
)
AC/DC = Mixed 230 V
AC
/48 V
DC
)
ITU Channel
Std = 1550±5nm
or
Two digit DWDM ITU channel from Channel 22 to 46
www.olsontech.com
Rev X2
3
Dec. 2007
