DATASH
EET
|
AUGUST 6, 2008
For more information on this and other products:
Contact Sales at Emcore 626-293-3400, or visit www.emcore.com.
1527
Applications
Video signal distribution to
HFC CATV and FTTP nodes
Supports CATV, QAM, and
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
Model 755M Optical Transmitter
DWDM, up to 20 km, Low Distortion, Wideband
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 Typ Max Units
Operating Temperature Range 0 25 50 °C
Wavelength (100 GHz ITU Options) 1530 - 1560 nm
Optical Power 10 - - dBm
Frequency Response (75Ω CATV Port)
(75Ω L-Band Port)
47
950
-
-
1002
2600 MHz
CNR 51 - - dB
CSO - - -60 dBc
CTB - - -65 dBc
C/I (3
rd
order, 950 – 2600 MHz) - - -60 dBc
SBS Suppression Capability
(Channel Option 11J & 57J only) - - 18 dBm
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.
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
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 Symbol Min Max Unit
Storage Temperature (power off) T
stg
-40 85 °C
75Ω CATV RF Input Level
Manual Mode
AGC Mode
-
-
-
-
-10
-5
dBm
L-Band RF Input Level - - +15 dBm
AC Input Range V
AC
94 250 V
AC
AC Input Frequency Range f
AC
50 60 Hz
Power Consumption P - 50 W
Optical Characteristics
Parameter Condition
Min Typ Max Unit
Optical Output Power - 10 - - dBm
SBS Threshold For RF input option 11J and
57J only - - 18 dBm
Wavelength - See table nm
Side Mode Suppression Ratio - 30 - - dB
Optical Return Loss
1
APC style connector 40 - - 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.
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
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 SYMBOL CONDITIONS MIN TYP MAX UNIT
Operating Temperature Range T
op
- 0 - 50 °C
CATV Response Flatness S
21-CATV
47MHz - 1002MHz,
Peak to Valley - - 1.5 dB
Test Port Response Flatness S
21-TP
Relative to 75 Ohm Input -1 - 1 dB
CATV Input Return Loss S
11-CATV
47 MHz – 1002 MHz, 75Ω 16 - - dB
Test Port Return Loss S
11-TP
47 MHz – 1002 MHz, 75Ω 16 - - dB
RF Test Point Level P
out-TP-CATV
Relative to 75 Ohm
Input Level -21 -20 -19 dBm
CATV RF input power detection range
- Note 1 -20 - -9.7 dBm
AGC Range - Perform to specification -3 +3 dB
L-Band Response Flatness S
21-Lband
950MHz – 2600 MHz,
Peak to valley - - 3.5 dB
L-Band Return Loss S
11-LBand
950MHz – 2600 MHz 16 - - dB
L-Band Input Level P
in-LBand
- -0.5 0 +0.5 dBm
L-Band Input C/I (3
rd
Order)
F1=2000MHz, F2=2000.5MHz
2-tone @ -3dBm/tone
Rx Opt Power = 0dBm
CATV Input with Loading specified
in CATV 75Ω Input Option
- - -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.
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
755M, Noise and Distortion Characteristics for CATV Input
CATV 75Ω
ΩΩ
Ω Input Option RF Level/ch
(dBmV)
Composite
(dBm) BER
(5)
CNR
(1,2)
(dB)
CSO
(1,3,6)
(dBc)
CTB
(1,3,6)
(dBc)
79ch NTSC
(4)
15 -14.77 - 51 -60 -65
79ch NTSC + 75ch QAM @ -6dB
(4)
79ch = 15
75ch QAM = 9 -13.84 10
-7
49 -60 -65
110ch NTSC
(4)
13.57 -14.77 - 48.5 -60 -65
42ch CENELEC
(4)
17.75 -14.77 - 52 -60 -65
60ch PAL
(4)
16.2 -14.77 - 52 -60 -65
JCTEA: 57ch Analog + 40ch QAM @ -10dB
(7)
57ch = 16.2
40ch QAM = 6.2 -14.70 -
46 -60 -65
JCTEA: 11ch + 80ch QAM @ -10dB
(8)
11ch = 21.2
80ch QAM = 11.2 -14.76 - 46 -60 -65
1. Test with 3m and 20km of SMF28 fiber.
2. CNR may degrade up to 0.5dB over the operating temperature range.
3. CSO and CTB may degrade up to 1.5dB over the temperature range.
4. Test with 0 dBm received optical power.
5. QAM format = 256-QAM, ITU-T J.83 Annex C, Analog channels are modulated.
6. L-band input is injected with 2 tones, F1 = 2000MHz, F2 = 2000.5MHz with –3dBm/tone.
7. 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.
8. 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.
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
Package Characteristics
Parameter Dimension
Unit
Height 1.75 (44), 1RU Inch (mm)
Width 19 (483) Inch (mm)
Depth 17.77 (452) with fans Inch (mm)
Weight 9.0 (4) Pounds (kg)
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
ITU Channel Numbering
Channel Wavelength
(nm)
Channel Wavelength
(nm)
Channel Wavelength
(nm)
62 1527.99 47 1539.77 32 1551.72
61 1528.77 46 1540.56 31 1552.52
60 1529.55 45 1541.35 30 1553.33
59 1530.33 44 1542.14 29 1554.13
58 1531.12 43 1542.94 28 1554.94
57 1531.90 42 1543.73 27 1555.75
56 1532.68 41 1544.53 26 1556.56
55 1533.47 40 1545.32 25 1557.36
54 1534.25 39 1546.12 24 1558.17
53 1535.04 38 1546.92 23 1558.98
52 1535.82 37 1547.72 22 1559.79
51 1536.61 36 1548.51 21 1560.61
50 1537.40 35 1549.32 20 1561.42
49 1538.19 34 1550.12 19 1562.23
48 1538.98 33 1550.92 18 1563.05
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
Outline Drawing
Dimensions are in inches.
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DATASHEET
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AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
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.
Single-mode fiber pigtail with SC/APC connectors (standard).
Wavelength = 1.5 µm.
Maximum power = 30 mW.
Caution: Use of controls, adjustments and procedures other than those specified herein may result in
hazardous laser radiation exposure.
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EMCORE CORPORATION
Model 755M Optical Transmitter
Ordering Information – Model Number Options
755M-vv-www-xxx-yy-zz
Example
755M-20-079-L75-18-SA: 755MM-M, ECL, 20km, 79 channel NTSC, CATV + 75Ω L-Band input, ITU channel 18, SC/APC
optical connector.
Model Version
755M, ECL laser
Fiber Length
vv = 20, 0 to 20km
Channel Plan
www = 079, 79ch NTSC
www = 79Q, 79ch NTSC + 75ch QAM
-256 format
www = 110, 110ch NTSC
www = 042, 42ch CENELEC
www = 060, 60ch PAL
www = 11J, JCTEA, 11ch
Analog + 80ch QAM-64 format
www = 57J, JCTEA, 57ch Analog + 40ch QAM
-64 format
Optical Connector
zz = FA, FC/APC
zz = SA, SC/APC
zz = E2, E2000/APC
Information contained herein is deemed to be reliable and accurate as of issue date. EMCORE reserves the right to change the design or specifications of
the product at any time without notice. EMCORE and the EMCORE logo are trademarks of EMCORE Corporation.
755M Datasheet 08-06-2008
Copyright 2008. EMCORE Corporation
EMCORE CORPORATION
2015 West Chestnut Street
Alhambra, California 91803
-1542
Tel: 626-293-3400
Fax: 626-293-3428
www.emcore.com
Input Option
xxx = C75, CATV Input only, 75Ω
xxx = L75, CATV Input + L-Band, 75Ω
ITU Grid Wavelength
zz = 00, Non ITU grid
zz = 18 to 62, ITU grid