1550nm Direct Modulation Optical Transmitter

1550nm Direct Modulation Optical Transmitter
（Instructions）
Product features：
 In the CATV and telephone applications launch of PAL, NTSC, digital or
compressed digital information.
 Using high linearity, optical isolation, distributed feedback, DFB laser
thermoelectric cooling.
 Front panel display and working conditions by the microprocessor-controlled
diagnostic tests.
 RF input bandwidth 47-860MHz, transfer of up to 59 PAL channels.
 built-in RF driver amplifier, just a low drive level input.
 automatic laser modulation (OMI) control, AGC & MGC.
 with front panel RF input test point.
 industry-standard status monitoring interface.
 Wavelength 1550nm.
Product overview：
1550nm direct-dimming transmitter is a high-index multifunctional AGC and dual
optical transmitter modules, CATV and telephone applications in the transmission of
PAL, NTSC digital or compressed digital signals. The series transmitter with high
linearity, optical isolation, distributed feedback, DFB laser is used as the basis of
thermoelectric refrigeration, for multi-channel television signal transmission specially
designed. Equipped with comprehensive and reliable optical power output of a stable
thermoelectric cooler circuit and laser temperature control circuit to ensure optimal
machine performance and long life laser stability.
 Double Module RF-driven, highly efficient pre-distortion correction

laser.(1550nm direct modulation, laser)
CNR≥52dB、CTB≤-67dB、CSO≤-62Db
 Automatic laser modulation (OMI) control, AGC & MGC.
Work on the AGC state, input level in the 78dBμV ~ 88dBμV range of the system can
achieve the best indicator.
Working in MGC state, through the front panel ATT, can be adjusted within the
scope 75dBμV ~ 90dBμV.
 20 OMI dedicated front-panel status display (Modulation Depth), can be
intuitively adjust and tips
Laser modulation to normal (NOM) or low (LOW), too high (High).
Work on the AGC status, RF rated input range, OMI has been NOM will be in the
state.
MGC works in the state, regulate ATT, can be easily OMI is NOM
● Built-in dual power supply backup, automatic switching.
Can be a single-supply operation, the other only for Cold backup (recommended
routine to be shipped).
Dual power supplies can work simultaneously, the other only for hot backup, such
as the one of them is damaged, then automatically switch to the other. Switching
time ≤ 10μS.
● automatic temperature control chassis to ensure long-life laser work.
Chassis temperature monitoring by the microprocessor, indicating Ping timely
showing that the actual work of chassis temperature.
When the chassis temperature is higher than set value (45 ℃), the rear panel of the
two highly efficient axial fan will automatically open, forced cooling.
When the temperature is reduced to set value (35 ℃), it will automatically shut down,
extending fan life.
dual RF inputs.
AM Interface Input 59 Road, PAL-D (47-550MHz)
Digital Interface (-10dB) Digital video input (550-750MHz)
Using this dictionary：

This machine has the work of the front panel status indicators, green display is
working properly, the red light flashing display alarm.
● Plug the power plug connected to power, such as the machine is working properly,
then the digital panel displays "READY: KEY OFF", the red light.
● For the protection of optical transmitter safety work, this machine has the power
delay function, that is, when the boot keys, the need to delay a few seconds, laser
will start. Status indicator changes from red light green light, digital panel displays
the aircraft model.
● V oice prompts:
Normal operation of the machine when the fixed time intervals will be issued BIP
slow beep sound: When there is failure, BIP will be issued a hasty voice.
● Menu Description
● Lasers laser operating parameters
● The machine number and date of manufacture
● Powers machine voltage
● Omi level AGC/MGC ATT .
using this dictionary
● Laser Menu
Laser Current （Laser bias current）
Laser Temp （ Laser temperature）
Laser Tex （Laser cooling current）
Laser Oup （Laser output power）
● System Menu
Laser S/N （Laser ID / Machine ID）
S/N (date production)
● Powes Menu
+5V -5V +24V （Machine voltage）
● OMI Level Menu
（With Managed）RF Mode=MGC （Modulation Debugging）、press "enter
ATT modulation suitable number 0-3000, according to ∧ ∨ key AGC / MGC
switch, according to" return to the menu.
（ordinary-sized）RF Mode=MGC（Modulation Debugging）ATT modulation
front panel, press Select to enter key press ↓ by ↑ ↓ Select button by AGC /
MGC switch
● The machine status information in any one exception occurs when the alarm
will be triggered (red flashing), the microprocessor will cut off the laser power, the
digital board displays cause of troubles.
● Local RF input is too high, too low to trigger alarms (RF red light).
Topswitch:
● the machine should have a good grounding, grounding resistance should be <4Ω.
According to international standards, 220V into the line three-wire system. Midline
for the ground wire.
●This machine adopts imported high-linear, highly reliable switching power supply
with constant voltage over-current protection, which has been equipped with fuses,
may be 110 ~ 254VAC grid work. The machine's microprocessor output DC voltage
of the monitors, if the fuse blew, indicating failures have occurred inside the
machine. Therefore, the rear panel of this machine with no fuse holder.
● Local optical signals output to FC / APC interface, other types (such as FC / PC) and
its distribution could not pick. Connector should be installed to keep clean.
● This machine into operation, do not look directly at the back panel of the light
output port, so as not to cause harm.
●The machine determines the RF drive level adjustment system for optical
transmitters. Therefore, also determines the system of indicators (CNR, CTB,
CSO). In the 59 Road, PAL-D transmission, HC-8600 Series Optical Transmitter
RF input level to 20dBmV. N-channel system in the transmission, the RF input level
should be revised following formula:
Si（N）=20+10Lg（59∕N）（dBmV）
Carrier to noise ratio degradation form：
(59 Rd PAL-D，CTB=65dB，CSO=60dB)
link loss
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
(dB)
53 52.5 52.0 51.6 51.2 50.4 50.1
53 52.6 52.2 51.8 51.4 51.1 50.5

54.1 53.7 53.2 52.6 51.9 51.1
54.5 54.0 53.0 52.5 52.0 51.0
56.0 55.0 54.0 53.0 52.0 51.0

55.8 55.0 54.2 53.4 52.6 51.0
55.0 54.0 53.0 52.0 51.0 50.0
54.4 53.6 52.8 52.0 51.2 50.4

53.5 52.5 52.0 51.0 50.0 49.0
Performance indicators
Optical Power (dB) 2-10

optical wavelength (nm) 1550
Optical connector SC∕APC
Operating bandwidth (MHz) 45～860
Channel number PAL-D 59 road
CNR (dB) 51
CTB (dB) -65
CSO (dB) -60
Transmission distance (km) 5-10km/15-25km/25-30km
RF input level (dBmV) 20
Flatness (dB) ±0.75
power consumption (W) 24
Supply Voltage (VAC) 110～254
working temperature (℃) 0～45
Size (mm) 483×385×44(19〞×15〞×1.75〞)
Warranty Policy:
● The Electronic Equipment Co., Ltd. fiber optic equipment warranty for one year.
Failure during the warranty period, repairs can be handled through the company.
Improper use by the user of the product or on its own to change or irresistible force,
resulting in direct or indirect damage or the resulting device link sexual
responsibility, the company is not invited, but any legal responsibility. For this
damage to the equipment, the company may carry out maintenance, as
appropriate, collect materials, maintenance costs and lost fees. Product sold a year
later, the company responsible for product life-long maintenance, where
appropriate, collect materials, fees, maintenance fees and transport costs.
Anti-revisionism procedures:
● Users find the machine fails, they should notify us. The following information: the
machine model, failure phenomena, purchase date, product number, your mailing
address, the company immediately to inform you of products will be damaged
remitted the designated locations, receipt of damaged product immediately after
maintenance, to the user, warranty The products will continue to enjoy the
remaining warranty period.

1550nm Direct Modulation Optical Transmitter

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1550nm Direct Modulation Optical Transmitter

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1550nm Direct Modulation Optical Transmitter

 Double Module RF-driven, highly efficient pre-distortion correction

Using this dictionary：

Carrier to noise ratio degradation form：

53 52.6 52.2 51.8 51.4 51.1 50.5

54.5 54.0 53.0 52.5 52.0 51.0

56.0 55.0 54.0 53.0 52.0 51.0

55.0 54.0 53.0 52.0 51.0 50.0

54.4 53.6 52.8 52.0 51.2 50.4

Optical Power (dB) 2-10

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