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1550nm Directly Modulated Optical Transmitter
The RFTV adopts high efficiency modulation mode for RF carrier wave and its economy, flexibility and bandwidth validity is beyond comparison of IPTV. By adopting EPON, GEPON or P2P access mode to realize triple-play and FTTx.

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INFORMATION

Description
According to the Next Generation Broadcasting (NGB) planning and PON standards, 1550nm is defined as the transmission wavelength for HFC downstream.

The high cost of 1550nm external modulated transmitter and dispersion effects of 1550nm directly modulated make network transformation difficult. Thus we create the 1550nm directly modulated optical transmitter with electronically controlled dispersion compensation.

It supports up to 1.2GHz band and DOCSIS 3.1 system. With two RF inputs and high isolation, it enables the signal transmission of QAM and IPQAM smoothly. Support a transmission distance of 50KM with electronically controlled dispersion compensation. Built-in CWDM is optional for multi-wavelength networking.


Performance Characteristics

  • 1.2GHZ band, support DOCSIS 3.1 system.
  • The AGC and MGC gain control modes are optional.
  • Two inputs with 50dB isolation for high quality RF insertion.
  • 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.

 

Technique Parameters

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

47870/1003/1218

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

020

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     

550-870MHZ 40CH digital signal 67dBuV/CH

25 Km, -1dBm input

C/CSO

dB

≥ 58

C/CTB

dB

≥ 63

CNR

dB

≥ 46

550MHZ 59CH analog signal 77dBuV/CH     

550-870MHZ 40CH digital signal 67dBuV/CH

50Km, -1dBm input

C/CSO

dB

≥ 55

C/CTB

dB

≥ 63

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

1

Application




Ordering information


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