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.
[table=98%,rgb(238, 238, 238)] [tr][td] Sandisk class 4 4g sd card, real shot, please refer to the picture. Brand new, no consumer protection, so it is posted in the second-hand category. 1. Sold inte...
My development environment is IAR6.40.1+Jlink+LM3S9B92+ucosIIv2.92 (official porting code) My ucosIIv2.92 porting code (ported to LM3S9B92) was obtained from the official website of ucosII without any...
[i=s] This post was last edited by melau on 2016-12-15 00:11 [/i] I have been under a lot of stress lately. How much stress is it exactly? Can I use LPS22HB to measure it? I can only say with regret: ...
How to use MSP430F149 timer A? I want to generate two timer interrupts, but I can only use CCR0. How to use CCR1 and CCR2? If it is configured as below, it will count to f000, then generate an interru...
In the
AI
boom, the most talked about is
neural network
. However,
AI
is much more than that. Let's learn about the relevant content with the network communication editor.
...[Details]
"Originally, there are many people who can design very good
chips
, but the market does not give domestic
chips
the opportunity to iterate, and domestic companies cannot give engine...[Details]
1. Purpose In actual product release, if the program stored in the MCU Flash is not protected, some illegal companies may read the program in the Flash through an emulator (J-Link, ST-Link, e...[Details]
In the actual project development process, hardware circuits often need to be modified, and the modified parts need to modify the driver. Thinking about the coming and going of such requirements is t...[Details]
The program got stuck during LCD initialization. Through hardware debugging, it was found that it was stuck in the Delay_ms() function. Going to the definition, it was found to be a macro definition ...[Details]
Recently, the US embargo on ZTE has attracted much attention. Let's take a look at the relevant content with the automotive electronics editor. On April 16, local time, the U.S. Department of Co...[Details]
background After the hardware engineer completed the PCB and schematic design, the routine was modified according to the tutorial of Zhengdian Atom to verify the correctness of the hardware. STM32F...[Details]
Nowadays, everyone is saying that "technology is people-oriented". The essence of the development of technology is to serve the improvement of the quality of life of human beings. Automated driving...[Details]
Kevin Jensen ams Semiconductor
Sensors
and lighting expert. Let's learn more about the relevant content with the network communication editor.
Everything is becoming "smart" these ...[Details]
As the weather gets colder, the way the north and south spend the winter has become a hot topic and people talk about it. Although the north is particularly cold, because there is heating, it can s...[Details]
The adoption of vehicle tracking systems for cars and fleets is increasing. Modern trackers have reduced form factors and increased functionality to support active data transmission for real-time tra...[Details]
The ZTE incident has aroused people's concerns about the future of Chinese chips, and they have been using WeChat and Weibo to express their views; the Chinese display industry is also worried abou...[Details]
Ouster LiDAR OS-1 (left) and OS-2 (center) Velodyne invented the modern 3D LiDAR scanner in the mid-2000s, but in recent years conventional wisdom has held that Velodyne’s design — 64 lasers mounted...[Details]
The following is a 16-way multi-channel ADC acquisition circuit diagram and source program made using the STM32 microcontroller. It uses a USB interface to connect to the computer, which is actually ...[Details]
Table of contents: 1 Overview 2: Common interrupt functions 3: PWM output 1 Overview In development, timers are widely used, which can be simply summarized into three aspects: 1.1: Application of ...[Details]
Microcontroller MCU
京公网安备 11010802033920号
EEWORLD
