1. Product Summary Optical transmitter is the most
important equipment to construct the CATV HFC network. It
mainly used for the long distance optical fiber transmission of TV
image signal, digital television signal, telephone voice signal and
data (or compressed data) signal. This product does use
the high-performance DFB laser as the optical
source. The RF drive part adopts RF power digital automatic
processing technology and advanced RF pre-distortion circuit, and
built-in microcomputer automatic monitoring system, to
ensure the excellent performance
indicators.2. Performance characteristicsAdopt
high-performance coaxial/butterfly DFB laser, narrow spectral
lines, good linearity and high output power.The RF drive part
adopts the RF power digital automatic processing technology.
Automatic processing the drive level power according to the RF
input signal level and the number of channels (15-84 channels),
make the CSO, CTB and C/N index always at the optimal value to
ensure the overall performance.Advanced multi-frequency RF
pre-distortion technology, combined with the GaAs device,
effectively improve the CATV system most important CTB and CSO
index, C/N index also gets the maximum upgrade. Adopt advanced
32 bit processor; coordinate with perfect automatic monitoring
system circuit. It can timely and accurately monitor working status
of the laser to ensure a stable optical output power and
effectively extend the working life of the laser. Built-in
blue screen 160×32 dot matrix LCD monitor on the front panel,
accurately showing all working status parameters.19″1U standard
rack mount, equipped standard IEEE802.3 10Base-T
Ethernet interface and RS232 interface, can expediently
realize network management monitoring. Fully support .3. Technology
Parameters3.1 Link test conditionsSpecial
instructions: The performance parameters of this manual
according to the measuring method of GY/T 143-2000 , and
tested under the specified test conditions.Test
condition: With standard optical fiber and standard optical
receiver composed the test link. Set 84 PAL-D analog TV
channel signal at 750MHz frequency range under the specified link
loss. When the optical input power of optical receiver is -1dBm,
measure the C/CTB, C/CSO and C/N.3.2 Technique Parameters
TableItemUnitTechnique parametersOptical output
powermW4681012141618202224262830Optical link
lossdB79101111.812.51313.61414.414.815.115.515.8Optical
wavelengthnm1310±20Laser type DFB laserOptical modulation
mode Direct optical intensity modulationOptical connector
type FC/APC or SC/APCFrequency rangeMHz47-750/862/1003RF input
leveldBuV72-88Flatness in banddB±0.75RF input impedanceΩ75Input
return lossdB≥ 16(47-550MHz); ≥ 14(550-750/862/1003MHz)C/CSOdB≥
60C/CTBdB≥ 65C/NdB≥ 51AGC control rangedB±5MGC control
rangedB0-10Power supply voltageVAC
110V-250V(50Hz)ConsumptionW30Operating temperatureºC0 -- 45Storage
temperatureºC-20 -- +65Relative humidity%Max 95% no
condensationDimensionmm483(L)×380(W)×44(H)3.3 Optical link carrier
to noise ratio degradation tableOptical powerOptical link loss
(dB)4567891011121314151617184mW53.852.851.85150.149.248.2 6mW 53.052.051.050.149.148.1 8mW 52.851.951.050.149.248.2 10mW 52.951.951.050.149.148.2 12mW 52.751.850.849.949.048.0 14mW 52.451.550.549.548.647.8 16mW 52.051.050.149.148.1 18mW 52.551.650.649.748.747.9 20mW 51.951.050.049.048.0 22mW 52.251.450.449.448.647.824mW 51.550.349.248.547.726mW 51.550.249.248.547.6ProcessCompany
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