Describe Product

870/1003/1218Mhz band, support DOCSIS 3.1 system.
The AGC and MGC gain control modes are optional.
Dual power supply; hot backup; a variety of power supply options are available, optional AC220V and DC48V.
Laser output power, bias current and cooling current are detected in real time.
Optional CWDM for optical signal insertion.
Electronically controlled dispersion compensation can support a transmission distance of 50KM.
Low-cost solution is comparable to the performance of external modulated transmitter.
ITU standard wavelength is optional.

Specifications

Schematic diagram

Diagram of 1550nm_Directly_Modulated_Optical_Transmitter.png

Note: The optical attenuator in the red dashed box and the wavelength division multiplexer in the blue dashed box are optional.

Specifications

Item	Unit	Parameter
Optical Part
Optical wavelength	nm	ITU wavelength
Laser type		Butterfly-typed DFB laser
Optical modulation mode		Direct optical intensity modulation
Optical connector type		FC/APC or SC/APC
Output optical power	mW	10	The insertion loss of the VOA and CWDM is excluded.
External optical signal input	dBm	-5～10
RF Part
Frequency range	MHz	47～870/1003/1218
RF input level	dBuV	77± 5
Flatness in band	dB	± 0.75
Input return loss	dB	≥ 16
RF AGC control range	dB	±5
RF MGC adjustable range	dB	0～20
RF input isolation	dB	≥ 50	Isolation between two RF inputs
RF input test port	dB	-20±1
Laser drive level test port	dB	-20±1
Electronically controlled optical attenuator tolerance	dB	≤1: ATT 0-15dB
		≤3: ATT 16-20dB
CNR	dB	≥ 48		550MHZ 59CH analog signal 77dBuV/CH
C/CSO	dB	≥ 58		550-870MHZ 40CH digital signal 67dBuV/CH
C/CTB	dB	≥ 63		25 Km, -1dBm input
CNR	dB	≥ 46		550MHZ 59CH analog signal 77dBuV/CH
C/CSO	dB	≥ 55		550-870MHZ 40CH digital signal 67dBuV/CH
C/CTB	dB	≥ 63		50Km, -1dBm input
MER	dB	≥ 40		25 Km, -1dBm input, 96CH digital 77dBuV/CH
		≥ 39		50 Km, -1dBm input, 96CH digital 77dBuV/CH

Others
Maximum power consumption	W	≤10
Operating temperature	℃	-5 ～ + 55
Storage temperature	℃	-30 ～ + 70
Weight	Kg	5.5

Structure Description

1550nm_Directly_Modulated_Optical_Transmitter

Front panel

1	Power indicator
2	Device running indicator: This indicator will flash by 1Hz frequency after the device start running normally.
3	Laser working status indicator: Steady green light: The laser is operating normally. Steady red light: The laser is not turned on. Blinking red light: The device has a parameter alarm. You can view the alarm in the Alarm Status, the second level submenu.
4	Laser drive level indicator: Steady green light: Drive level is normal. Blinking red light: Drive level alarm. You can view the alarm in the Alarm Status, the second level submenu.
5	160×32 dot-matrix LCD screen: used to display all the parameters of the machine.
6	Display the exit or cancel key of the setup menu.
7	Display the up or increase key of the setup menu.
8	Display the down or decrease key of the setup menu.
9	Display the enter key of the setup menu.
10	Laser switch: ON: The laser is on. OFF: The laser is off. Keep the laser off before the device is powered on, and turn on the laser after the self-inspection is completed when power on.
11	Laser drive level test port: -20dB

1550nm_Directly_Modulated_Optical_Transmitter_4.png

Rear panel

1	Fan	7	Optical signal output
2	Ground stud, ensure good grounding before power on	8	Optical signal input: without WDM, no this port
3	RF input 1	9	RS232 interface
4	RF input 2	10	LAN interface
5	RF input 1 test port -20dB	11	Power module 1, hot swappable
6	RF input 2 test port -20dB