Emcore’s Model 755MM-U is a directly modulated (DM) DWDM optical
transmitter specifically designed for wideband applications that require
both CATV and DBS signals to be carried over up to 20 km of fiber. This
facilitates networks designs that may use a single transmitter to carry
multiple signals.
The 755MM-U supports full 79-channel NTSC analog signal carriage up
to 10 km. A combination of QAM, DBS, and reduced channel analog
CATV, are supported in links up to 20 km.
Applications
Video signal distribution to
HFC CATV and FTTP nodes
Supports CATV, QAM, and
1527
DBS signal carriage
Replacement for externally
modulated transmitters
The 755MM family of transmitter products is designed to support various
CATV transmitter applications with a common platform. A 75Ω CATV RF
video input supports frequencies up to 870 MHz. Integrated within the
transmitter design are Emcore’s low chirp control, noise suppression
circuitry, and patented predistortion technology to provide outstanding
performance with any of Emcore’s wide range of cooled broadband
lasers. A second 75Ω RF input supports frequencies up to 2600 MHz for
FTTP, L-Band satellite, and wireless applications.
Performance Highlights
Min
Operating Temperature Range
Wavelength (100 GHz ITU Options)
Optical Power
Frequency Response (75Ω CATV Port)
(75Ω L-Band Port)
CNR (47 – 870 MHz)
CSO (47 – 870 MHz)
CTB (47 – 870 MHz)
C/I (3
rd
order, 950 – 2600 MHz)
SBS Suppression Capability
0
1530
10
47
950
52
-
-
-
-
Typ
25
-
-
-
-
-
-
-
-
-
Max
50
1560
-
870
2600
-
-56
-63
-60
15
Units
°C
nm
dBm
MHz
dB
dBc
dBc
dBc
dBm
Features
Dual redundant power
supplies
SNMP network interface
Dual RF inputs for CATV and
DBS
Available on 100 GHz spaced
ITU DWDM C-band channels
Optimized RF integration of
predistorter, amplifiers, and
laser
Complete, efficient laser bias
and TEC control circuitry
OEM/ODM opportunities
available through Emcore
Noise and distortion performance above assumes 79 channel NTSC loading with no QAM, 0 dBm
received optical power, 10 km SMF-28 fiber or equivalent. See following pages for complete
specifications and operating/test conditions.
For more information on this and other products:
Contact Sales at Ortel 626-293-3400, or visit www.emcore.com.
Model 755MM-U Optical Transmitter
PRELIMINARY DATASHEET| MAY 18, 2007
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings can cause permanent damage to the transmitter. These are absolute stress ratings
only. Functional operation of the device is not implied or guaranteed at these or any other conditions in excess of those given in the
operational sections of the data sheet. Exposure to absolute maximum ratings for extended periods can adversely affect device
reliability.
Parameter
Storage Temperature (power off)
75Ω CATV RF Input Level (without L-Band input)
75Ω L-Band RF Input Level (without CATV input)
AC Input Range
AC Input Frequency Range
DC Input Range
Power Consumption
Symbol
T
stg
-
-
V
AC
f
AC
V
DC
P
Min
-40
-
-
94
50
36
-
Max
85
+3
+15
245
60
60
50
Unit
°C
dBm
dBm
V
AC
Hz
V
DC
W
Optical Characteristics
Parameter
Optical Output Power
SBS Threshold
Wavelength
Side Mode Suppression Ratio
Optical Return Loss
1
Condition
-
10 km, SMF-28
-
-
APC style connector
Min
10
-
30
40
Typ
-
-
See table
-
-
Max
-
15
-
-
Unit
dBm
dBm
nm
dB
dB
1. In order to prevent reflection-induced distortion, the laser must be connected to an optical cable having a return loss of at least 55 dB for discrete
reflections and 30 dB for distributed reflections.
ORTEL, A division of EMCORE
2
Model 755MM-U Optical Transmitter
PRELIMINARY DATASHEET| MAY 18, 2007
RF Characteristics
Parameter
Bandwidth
Frequency Response
RF Input Level
-
47 - 870 MHz
950 - 2600 MHz
47 – 870 MHz
950 – 2600 MHz
SMF-28 or equivalent
Condition
Min
47
-
-
-2.5
-0.5
-
-
-
-
-
-
-
-
-
-
-
16
16
10
Typ
-
-
-
-2.0
0.0
52
2
51
47
3
-
-
-
-
-
-
75
50
-
-
-
1
Max
2600
1.5
3.5
1.5
0.5
-
-
-
-56
1,3
2
-60
-63
2
-65
3
-60
-60
-
-
-
-
-
1
Unit
MHz
dB
p-p
dbm
CNR
dB
CSO
SMF-28 or equivalent
dBc
CTB
C/I (3
rd
order)
Input Impedance
75Ω CATV Video Input Return Loss
75Ω CATV Test Port Input Return Loss
75Ω L-band Input Return Loss
1.
2.
3.
4.
SMF-28 or equivalent
950 – 2600 MHz RF Input
47 – 870 MHz RF Input
950 – 2600 MHz RF Input
47 to 870 MHz
47 to 870 MHz
950 to 2600 MHz
dBc
dBc
Ohms
dB
dB
dB
79 CW NTSC carriers, no QAM channels, 4 MHz noise bandwidth, 0 dBm received power, 10 km fiber.
77 CW NTSC carriers, 53 QAM-256 channels at –6 dB, 4 MHz noise bandwidth, -3 dBm received power, 10 km fiber.
10 CW JCTEA carriers, 75 QAM-256 channels at – 6 dB, L-band, 0 dBm received power, 20 km fiber.
Two –3 dBm/tone carriers, f
i
= 2000 MHz, f
2
= 2000.5 MHz, 75Ω input. 79-channel composite power = 46.8 dBmV, -5 dBm received power.
