www.olsontech.com
External Modulation 1550nm CATV Optical Transmitter
High-Performance Model OTOT-EM55XL
24926 Highway 108
Sierra Village, CA 95346
Phone: (800) 545-1022
Fax: (209) 586-1026
E-Mail: sales @olsontech.com
Features and Benefits
Rev X2 All Specifications Subject to Change Without Notice Dec. 2007
LCD display, LED status indication,
and front panel -20dB front panel
RF test point aide in set-up and
operation.
Dual, hot plug-in power supplies
available for high reliability; 100 to
240V or ± 36 to ±72 V .
AC DC
Electro-optical modulator offers
dual +6dBm optical outputs.
High performance externally
modulated 1550nm DFB laser
CATV transmitter.
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.
Adjustable SBS threshold from
+13dBm to +19dBm on 0.1dB
steps increases system flexibility.
Low noise, narrow linewidth CW-
DFB laser. DWDM ITU grid wave-
length is adjustable to ± 100GHz
via front panel.
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.
System Specifications
Min Typ Max Units
Laser Wavelength 1547 1560 nm
(ch. 23-38) ITU Grid
Wavelength Adjust (50 GHz steps) -100 +100 GHz
Laser Linewidth 0.3 MHz
Optical Output Power (dual) +5.0 +6.0 +7.0 dBm
SBS Suppression (adj 0.1dB Steps) +13 +19 dBm
RF Frequency Range 47 1000 MHz
Flatness (47-860MHz) <±0.75 dB
Flatness (860-1000MHz) <±1.5 MHz
Number of Channels
TV/FM (-4dB) /QAM64 (-10dB) 84/0/0
Noise Bandwidth 5 MHz
CNR Tx/Rx 52.5 dB
CNR Link 1 52.0 dB
CNR Link 2 50.5 dB
CNRLink3 49 dB
CSO Tx/Rx and Link 1 65 dBc
CSO Link 2 65 dBc
CSO Link 3 at output #1 63 dBc
CTB 65 dBc
Number of Channels
TV/FM (-4dB) /QAM64 (-10dB) 77/0/0
Noise Bandwidth 4 MHz
CNR Tx/Rx 53.5 dB
CNR Link 1 53.0 dB
CNR Link 2 52.0 dB
CNR Link 3 50.0 dB
CSO Tx/Rx and Link 1 65 dBc
CSO Link 2 65 dBc
CSO Link 3 at output #1 65 dBc
CTB 65 dBc
Version PAL84
Channel Plan PAL-D
Version N77
Channel Plan NTSC
Optical and RF Performance
(with SM 9/125µm Fiber)
CATV Transmitter
www.olsontech.com
Min Typ Max Units
Weight 21.4 lbs.
9.7 kg
Dimensions(WxLxH) 19x11x1.75 in.
482.6 x 279.4 x 44.5 mm
Physical Characteristics
General Characteristics
(with SM 9/125µm Fiber)
Min Typ Max Units
Laser Wavelength 1540 1560 nm
(ch. 22-46) ITU Grid
Optical Connector SC/APC
FC/APC
Side Mode Suppression >30 dB
Relative Intensity Noise <-158 <-160 dBc/Hz
Nom. Input Level per Tx Ch. 20 dBmV
RF Monitor Output Level -20 dB
(+0.2 to -0.8dB @ 862 MHz;
-1.3dB @ 1GHz)
AGC Dynamic Range -6 +3 dB
Impedance (F-female) 75 Ohm
Return Loss (47 MHz, -1.5dB/oct.) >15 >20 dB
Control Interface Ethernet 10/100 MB/s
Rev X2 2 Dec. 2007
Min Typ Max Units
Power Supply Voltage 100 240 V
Power Supply Voltage ±36 ±72 V
Power Consumption (110V ) <50 W
Power Consumption (48V ) <50
Operating Temp. Range 0 +50 °C
Storage Temp. Range -20 +85 °C
Humidity 20 85 %
EMI meets EN50083-2 (April 1996) and EN50083-2/A1 (February 1998).
AC
DC
AC
DC
Electrical and Environmental Characteristics
CATV Transmitter
www.olsontech.com
Rev X2 3 Dec. 2007
Ordering Information
Test Configurations
OTOT-EM55 XL Freq. Plan
(See Below)
Opt. Conn.
(See Below)
RF Conn.
(See Below)
XX
(ITU Ch.)
Power Supp.
(See Below)
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 )
DC/DC = 2x (±36 to ±72 V )
AC
DC
AC/DC = Mixed 230 V /48 V )
AC DC
Tx/Rx
Booster EDFA First Fiber Length
No
No
16dBm
13dBm 13dBm
35km
65km
52km 52km
No No
No
No
No
No
No
0dBm
0dBm
0dBm
0dBm
Second Fiber Length Rx
In-Line EDFA
Link 1
Link 2
Link 3
ITU Channel
Std = 1550±5nm
or
Two digit DWDM ITU channel from Channel 22 to 46
1) Rx with 7pA/Hz Input Noise Current Density
2) EDFA’s with 5dB Noise Figure
3) RF Input Level at 20dBm/Channel
NOTES:
