Emcore’s Model 755M 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 755M supports full 79-channel NTSC analog signal and or a
combination of QAM, DBS with reduced channel analog CATV. The
fiber length the 755M can support is up to 20km.
The 755M 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 1002 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
CSO
CTB
C/I (3 order, 950 – 2600 MHz)
SBS Suppression Capability
(Channel Option 11J & 57J only)
rd
Applications
Video signal distribution to
HFC CATV and FTTP nodes
Supports CATV, QAM, and
1527
DBS signal carriage
Replacement for externally
modulated transmitters
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
RoHS
Typ
25
-
-
-
-
-
-
-
-
-
Max
50
1560
-
1002
2600
-
-60
-65
-60
18
Units
°C
nm
dBm
MHz
dB
dBc
dBc
dBc
dBm
0
1530
10
47
950
51
-
-
-
-
Noise and distortion performance above assumes 79 channel NTSC loading with no QAM, 0 dBm
received optical power, 20 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 Emcore 626-293-3400, or visit www.emcore.com.
Model 755M Optical Transmitter
DATASHEET| AUGUST 6, 2008
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
Manual Mode
AGC Mode
L-Band RF Input Level
AC Input Range
AC Input Frequency Range
Power Consumption
-
-
V
AC
f
AC
P
Symbol
T
stg
Min
-40
-
-
-
-
94
50
-
Max
85
-10
-5
+15
250
60
50
Unit
°
C
dBm
dBm
V
AC
Hz
W
Optical Characteristics
Parameter
Optical Output Power
SBS Threshold
Wavelength
Side Mode Suppression Ratio
Optical Return Loss
1
Condition
-
For RF input option 11J and
57J only
-
-
APC style connector
Min
10
-
Typ
-
-
See table
Max
-
18
Unit
dBm
dBm
nm
30
40
-
-
-
-
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.
EMCORE CORPORATION
2
Model 755M Optical Transmitter
DATASHEET| AUGUST 6, 2008
RF Characteristics
The following specifications are reference at 25C. The test receiver responsivity of 0.95 A/W (at 1550 nm) and an
equivalent noise current of 7pA/rt(Hz). Test fiber is single mode, Corning SMF-28 (or equivalent) with 0.25 dB/km
maximum loss (at 1550 nm). In order to prevent reflection-induced distortion, the transmitter subassembly must be
connected to an optical cable with discrete reflections < -55 dB and distributed reflections < -30 dB.
PARAMETER
Operating Temperature Range
CATV Response Flatness
Test Port Response Flatness
CATV Input Return Loss
Test Port Return Loss
RF Test Point Level
CATV RF input power detection range
SYMBOL
T
op
S
21-CATV
S
21-TP
S
11-CATV
S
11-TP
P
out-TP-CATV
-
-
S
21-Lband
S
11-LBand
P
in-LBand
CONDITIONS
-
47MHz - 1002MHz,
Peak to Valley
Relative to 75 Ohm Input
47 MHz – 1002 MHz, 75Ω
47 MHz – 1002 MHz, 75Ω
Relative to 75 Ohm
Input Level
Note 1
Perform to specification
950MHz – 2600 MHz,
Peak to valley
950MHz – 2600 MHz
-
F1=2000MHz, F2=2000.5MHz
2-tone @ -3dBm/tone
Rx Opt Power = 0dBm
CATV Input with Loading specified
in CATV 75Ω Input Option
MIN
0
-
-1
16
16
-21
-20
-3
-
16
-0.5
TYP
-
-
-
-
-
-20
-
MAX
50
1.5
1
-
-
-19
-9.7
+3
UNIT
°C
dB
dB
dB
dB
dBm
dBm
dB
dB
dB
dBm
AGC Range
L-Band Response Flatness
L-Band Return Loss
L-Band Input Level
-
-
0
3.5
-
+0.5
L-Band Input C/I (3 Order)
rd
-
-
-60
dBc
1.
Detects RF power of CATV input port only. The total input power is defined in section 3.10 and 3.11. The input RF power detector
can handle the input power range between +5 to –10dB range from the nominal input power level.
EMCORE CORPORATION
3
Model 755M Optical Transmitter
DATASHEET| AUGUST 6, 2008
755M, Noise and Distortion Characteristics for CATV Input
CATV 75Ω Input Option
Ω
79ch NTSC
(4)
RF Level/ch
(dBmV)
15
Composite
(dBm)
-14.77
-13.84
-14.77
-14.77
-14.77
-14.70
-14.76
BER
-
10
-
-
-
-
-
(5)
CNR
(dB)
51
(1,2)
CSO
(dBc)
-60
-60
-60
-60
-60
-60
-60
(1,3,6)
CTB
(dBc)
-65
-65
-65
-65
-65
-65
-65
(1,3,6)
79ch NTSC + 75ch QAM @ -6dB
110ch NTSC
(4)
(4)
(4)
79ch = 15
75ch QAM = 9
13.57
17.75
16.2
(7)
-7
49
48.5
52
52
46
46
42ch CENELEC
60ch PAL
(4)
JCTEA: 57ch Analog + 40ch QAM @ -10dB
JCTEA: 11ch + 80ch QAM @ -10dB
1.
2.
3.
4.
5.
6.
7.
8.
(8)
57ch = 16.2
40ch QAM = 6.2
11ch = 21.2
80ch QAM = 11.2
Test with 3m and 20km of SMF28 fiber.
CNR may degrade
up
to 0.5dB over the operating temperature range.
CSO and CTB may degrade up to 1.5dB over the temperature range.
Test with 0 dBm received optical power.
QAM format = 256-QAM, ITU-T J.83 Annex C, Analog channels are modulated.
L-band input is injected with 2 tones, F1 = 2000MHz, F2 = 2000.5MHz with –3dBm/tone.
Test with EDFA,
–6dBm
received optical power, QAM format = 64-QAM. 2 tones, F1 = 2000MHz, F2 = 2000.5MHz,
applied to L-Band port with –3dB/tone. 18dBm launch power.
Test with EDFA,
–8dBm
received optical power, QAM format = 64-QAM. 2 tones, F1 = 2000MHz, F2 = 2000.5MHz,
applied to L-Band port with –3dB/tone. 18dBm launch power.
Top 10 popular logic chips and programmable logic arrays in the first quarter of 2006TI's RS-485 transceivers offer over 15kV ESD protection Editor's Choice: Texas Instruments' latest 3.3V and 5V full...
[color=#000]With the development of multithreading technology, the main() function, which was originally entrusted with important tasks, has gradually degenerated and neglected, and now has become a "...
It takes some effort to walk out of some yellow and dry memories. No one mentions the holes in the pair of sneakers thrown at the foot of the bed anymore. I have walked many roads wearing them. If...
I want to share this with you. I have posted it in the MCU section before. Friends who have downloaded it don't need to download it again. It is the same. Friends who haven't downloaded it can downloa...
Is level conversion required when MSP430F5438 communicates with Huawei MG323? When the MCU voltage is 3.3V and the MG323 voltage is 3.8V, is the SP3223E level conversion chip still needed? The MG323 m...
USRP is still very interesting, but may be a little sensitive, so please search on Baidu. There are pcb files for USRP in the gnuRADIO project, but they basically cannot be opened. If you open them wi...
A vacuum eutectic furnace is a critical piece of equipment used in the manufacturing and processing of various materials, particularly in the fields of microelectronics and nanotechnology. One of t...[Details]
1 Introduction
In the mid-1960s, American scientist Maas conducted extensive experimental research on the charging process of open-cell batteries and proposed an acceptable charging curve for ...[Details]
According to foreign media reports, Nissan Motor has recently reached a cooperation with US battery technology company LiCAP Technologies to jointly promote the research and development of next-gen...[Details]
Electric vehicles' 12V batteries don't rely on a generator to power them. Only gasoline-powered vehicles rely on the engine to drive a generator to generate electricity while driving, which is used...[Details]
There are many motors that can use thyristor speed control, and they can be used in almost all industries. Various types of motors, such as fans, pumps, AC motors, DC motors, torque motors, single-...[Details]
Lightweighting of automobiles is still a relatively unfamiliar term for automobiles. With the continuous improvement of environmental protection requirements, relevant regulations have also put for...[Details]
New version helps developers build secure and trustworthy embedded systems
Shanghai, China—August 21, 2025—
QNX, a division of BlackBerry Ltd., today announced the release of QNX...[Details]
With the prevalence of online conferencing, live streaming, and voice communication in gaming, high-quality audio input devices are becoming increasingly important. To this end, XMOS, an expert in ...[Details]
Since the beginning of the 21st century, with the rapid development of my country's urban and rural economies and the improvement of people's living standards, more and more people have begun to ow...[Details]
Traditionally, electrical energy is transmitted primarily through wires, requiring direct physical contact between the power source and the load. With the increasing number of electrical devices in...[Details]
According to Reuters, citing people familiar with the matter, British semiconductor design company Arm Holdings (NASDAQ:ARM) has hired Rami Sinno, head of Amazon's (NASDAQ:AMZN) artificial intellig...[Details]
Renesas Electronics introduces a new USB-C power solution with an innovative three-level topology.
Improve performance while reducing system size
New solution combines excel...[Details]
The automotive transmission is the foundation of a vehicle's motion. The vehicle's drivetrain transfers engine power to the drive wheels, enabling the vehicle to move. The vehicle's drivetrain cons...[Details]
Munich, Germany, August 19, 2025 –
Infineon Technologies AG, a global semiconductor leader in power systems and the Internet of Things, announced today that its AIROC™ CYW20829 Bluetooth® low e...[Details]
NPN and PNP are two commonly used transistor circuits. They play an important role in industrial automation and control systems. This article will explain the difference between NPN and PNP and exp...[Details]
FPGA/CPLD
京公网安备 11010802033920号
EEWORLD
