Fiber networks to the home are not only perfectly suitable for data transmission but can also be used as an ideal medium for the transmission of TV signals. The CATV overlay method utilizes this feature to transmit particularly broadcast TV content efficiently via Fiber to the Home networks. It provides the customer with digital and analog TV with an equivalent data rate of several gigabit per second.
As telcos turn to triple-play services (video, voice and high-speed internet access) to reduce churn and increase revenue, they need to find a way of delivering TV and video to the end-user as cost-effectively as possible. Each of the major point-to multi point PON variants – BPON, GPON and EPON – offers TV/video service: RF (radio frequency) overlay.In a point-to-multipoint PON architecture, one wavelength frequency is assigned for downstream data and telephony (1490 nm) and another is assigned for upstream data (1310 nm). With the RF overlay approach, through the use of wave-division multiplexing (WDM), a third downstream frequency is assigned – 1550 nm – which is dedicated to video broadcast. RF overlay is capable of delivering all types of video service: analogue broadcast, digital broadcast and HDTV, and video-on-demand.
GEZHI Photonics' CATV overlay Multiplexers are commonly used to divide or combine signals from different locations in an optical
network. This model has built-in Wavelength-division multiplexing (WDM).
These products feature low insertion loss, high directivity and are specially designed for CATV and FTTH/
FTTx networks. This product is optimized for networks where IP and RF is distributed via a single fibre to
the curb/building/home.
Features High stability Low insertion loss High Reiliability | Applications Fiber to the Home (FTTH) systems EPON/GPON System CATV System |
Performance
Parameter | Specification | ||||
Port | 1x8 | 1x16 | 1x32 | 1x64 | |
Insertion Loss (dB) | CATV IN | ≤12 | ≤15.2 | ≤18.5 | ≤21.5 |
DATA IN | ≤1.0 | ≤1.0 | ≤1.0 | ≤1.0 | |
Operating Wavelength (nm) | Common | 1260~1620 | |||
CATV IN | 1540~1620 | ||||
DATA IN | 1260~1360; 1460~1500 | ||||
Isolation (dB) | CATV IN | ≥30 | |||
DATA IN | ≥15 | ||||
Directivity (dB) | >50 | ||||
Return Loss(dB) | >45 | ||||
Maximum Power Handling (mW) | 300 | ||||
Opterating Temperature (℃) | -20~+75 | ||||
Storage Temperature (℃) | -40~+85 |
CATV Overlay Multiplexer diagram
Ordering Information
Model | Configuration | Package type | Cable type | Fiber length | Connector |
CATV | 08WDM=08 Port COM & DATA IN 16WDM=32 Port COM & DATA IN 32WDM=64 Port COM & DATA IN 64WDM=64 Port COM & DATA IN S=Specify | A1=ABS box 100x80x10mm A2=ABS box 120x80x18mm A3=ABS box 140x115x18mm L1=LGX 129*29*130mm L2=LGX insert in 2slot Rack L4=LGX insert in 4slot Rack R1=19" 1 U Rack R2=2slot 19″1U Rack R4=4slot 19″1U Rack S=Specify | 00=None 09=900um loose tube S=Specify | 00=None 05=0.5m 10=1.0m | 00=none MPO=MPO |