Emcore’s Model 755MM-X is a directly modulated (DM) DWDM optical
transmitter specifically designed for CATV transmission over fiber links
up to 65 km.
The 755MM-X supports full 79-channel NTSC analog signal carriage
with RF bandwidth up to 870 MHz. The 755MM-X supports dual power
supplies as well as the SNMP network interface protocol.
Applications
Video signal distribution to
HFC CATV and FTTP nodes
Video overlay in passive
1527
optical networks
Replacement for externally
modulated transmitters
The 755MM family of transmitter products is designed to support various
CATV transmitter applications with a common platform. 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.
The 755MM-X incorporates the Hybrid Modulation
TM
(patent pending)
scheme to enable the performance of externally modulated transmitters
with the ease of tuning directly modulated transmitters.
Performance Highlights
Min
Operating Temperature Range
Wavelength (100 GHz ITU Options)
Optical Power
Frequency Response
CNR
CSO
CTB
SBS Suppression Capability
RF Input Return Loss
Optical Return Loss
0
1540
6
47
-
-
-
-
16
40
Typ
25
-
7
-
52
-
-
-
-
-
Max
50
1560
-
870
-
-65
-65
16
-
-
Units
°C
nm
dBm
MHz
dB
dBc
dBc
dBm
dB
dB
Features
Enhanced optical spectrum
shaping technology
Dual redundant power
supplies
SNMP network interface
Available on 200 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, 65 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 755MM-X Optical Transmitter
PRELIMINARY DATASHEET| JUNE 17, 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 RF Input Level
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
250
60
60
75
Unit
°C
dBm
V
AC
Hz
V
DC
W
Optical Characteristics
Parameter
Optical Output Power
SBS Threshold
Wavelength
Wavelength Stability
Side Mode Suppression Ratio
Optical Isolation
Optical Return Loss
2
1
Condition
-
10 km, SMF-28
-
400 GHz spacing
-
-
APC style connector
Min
6
-
-50
30
30
35
Typ
7
-
See table
-
-
-
-
Max
-
16
+50
-
-
-
Unit
dBm
dBm
nm
pm
dB
dB
dB
1. SBS threshold is measured on the basis of noise floor increase of 1 dB versus optical launch power at constant optical receiving power.
2. 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.
ITU Channel Numbering
Channel
21
23
25
27
29
Wavelength
(nm)
1560.61
1558.98
1557.36
1555.75
1554.13
Channel
31
33
35
37
Wavelength
(nm)
1552.52
1550.92
1549.32
1547.72
Channel
39
41
43
45
Wavelength
(nm)
1546.12
1544.53
1542.94
1541.35
EMCORE CORPORATION
2
Model 755MM-X Optical Transmitter
PRELIMINARY DATASHEET| JUNE 17, 2007
RF Characteristics
Parameter
Bandwidth
Frequency Response Flatness
Test Port Flatness
RF Input Level
CNR
1
Condition
-
47 - 870 MHz
Relative to 75Ω input
AGC On, 79-channel
25°C, SMF-28 or equivalent
25°C, SMF-28 or equivalent
25°C, SMF-28 or equivalent
47 – 870 MHz
47 to 870 MHz
47 to 870 MHz
Min
47
-
-1
16
52
-
-
-
16
16
1
Typ
-
-
-
18
-
-
-
75
-
-
Max
870
1.5
+1
19
-
-65
1
-65
1
-
-
-
Unit
MHz
dB
p-p
dB
dBmV/ch
dB
dBc
dBc
Ohms
dB
dB
CSO
1
CTB
1
Input Impedance
75Ω Video Input Return Loss
75Ω Test Port Input Return Loss
1.
79 CW NTSC carriers 50 MHz to 550 MHz, no QAM channels, 4 MHz noise bandwidth, 0 dBm received power, 65 km fiber, 6 dB NF EDFA.
Package Characteristics
Parameter
Height
Width
Depth
Weight
Dimension
1.75 (44), 1RU
19 (483)
19.44 (495) with fans
20.0 (8.9)
Unit
Inch (mm)
Inch (mm)
Inch (mm)
Pounds (kg)
EMCORE CORPORATION
3
Model 755MM-X Optical Transmitter
PRELIMINARY DATASHEET| JUNE 17, 2007
Outline Drawing
Dimensions are in inches.
EMCORE CORPORATION
4
Model 755MM-X Optical Transmitter
PRELIMINARY DATASHEET| JUNE 17, 2007
Laser Safety Information
This product meets the appropriate standard in Title 21 of the Code of Federal Regulations (CFR). FDA/CDRH
Class IIIb laser product. A supplemental FDA application has been filed and it is anticipated that the accession
number for this product will be 0220309 since this accession number is from a similar product family. Final
determination will be no later than 1/1/05.
Single-mode fiber pigtail with SC/APC connectors (standard).
Wavelength = 1.5
μm.
Maximum power = 30 mW.
Because of size constraints, laser safety labeling (including an FDA class IIIb label) is not affixed to the module,
but attached to the outside of the shipping carton.
Product is not shipped with power supply.
Caution: Use of controls, adjustments and procedures other than those specified herein may result in
