Optical Node / Receiver
Manufacturer in China
Premlink plays a vital role in designing and manufacturing CATV optical transmitter.
Premlink – Your Trusted CATV Optical Node and Optical Receiver Partner
What is a CATV Optical Node?
CATV optical node is a photoelectric conversion device whose primary function is to convert the received CATV RF optical signal to an electrical RF signal.
CATV optical node is critical in the HFC (Hybrid Fiber Coaxial) cable TV system because it ensures that the optical signal is properly received and that the end-user sees a high-quality TV picture. CATV optical nodes are used when combined with an optical transmitter and EDFA. In long-distance signal optical transmission, the optical transmitter provides the optical signal through the EDFA, and the optical cable delivers it to the CATV optical node.
CATV optical node turns it into RF electrical signals. This conversion is important for ensuring the quality and stability of TV broadcasts, particularly in long-distance transmission or conditions with significant signal attenuation. The final RF signal is sent through coaxial cables to set-top boxes and displayed on televisions.
Optical Node vs. Optical Receiver: What's the Difference?
The difference between a CATV optical node and a CATV optical receiver is that the former is bi-directional (forward and return path), whereas the latter is forward only, with no return path. However, nowadays people have almost no differentiation between optical node and optical receiver.
Premlink CATV Optical Node/Receiver Product Series
CATV Optical Node/Receiver Comprehensive Classification Guide
1. By Direction: Uni-directional vs. Bi-directional
Uni-directional: only has the forward receiving function.
Uni-directional optical receivers have frequencies of 47~862MHz, 47~1002MHz, and 47~1218MHz. Depending on the frequency division point, there are also frequencies beginning at 54MHz, 65MHz, and 105MHz.
Bidirectional: The optical node ‘s job is to receive power optical signals in the forward direction and transmit data in the reverse direction. The bi-directional optical node’s frequency is 5~862MHz, 5~1002MHz, 5~1218MHz, or 5~1800MHz (DOCSIS 4.0).
2. By Installation Environment: Indoor vs. Outdoor
Indoor: it is not weatherproof. The dust prevention effect is quite weak. 1RU rack-mounted optical receiver is primarily utilized in headend rooms, but they can also be found in buildings and households.
Outdoor: intended for outdoor or wilderness areas, capable of withstanding tough conditions, with good waterproofing, dustproofing, anti-corrosion, and other characteristics that ensure constant operation even in complicated environments.
3. By Application Area: FTTH, FTTB, and FTTC
FTTH: This kind of receiver is compact in size, has a low output level, and only serves one function, which is to receive photoelectric signal.
FTTB : This kind of receiver is appropriate for buildings, residential units, or building, complexes with high output levels capable of meeting the distribution requirements of a building’s television signals.
FTTC : This type of receiver is big in size, has sophisticated functions, and has very high output level, allowing it to meet the cable TV needs of the entire community.
4. By Power Source: Active vs. Passive
Active type refers to typical optical nodes / receivers with a power source.
A passive optical receiver is one that does not require a power supply or power adaptor. This type of receiver is a new device that has appeared in recent years, specifically built for fiber-to-the-home (FTTH), simple to install, and extremely inexpensive. It is mainly used for digital television receiving.
5. By Management Function: Managed vs. Non-Managed
The optical node or receiver with management, known as FTTB and FTTC optical nodes or receivers, has built-in network management that allows it to monitor its operating state and change some fundamental parameters.
The optical node / receiver without Management function: it is a standard optical receiver.
6. By Input Optical Paths: Single vs. Redundant
One input optical path: It means that the number of input optical paths is only one.
2 Input optical path: There are two input optical paths that are the primary input port and the backup input port. When there is a problem with the main path, it automatically switches to the backup path.
When choosing the correct optical node for a new deployment or an upgrade to an existing network, keep this decision-making framework in mind:
1) Network Architecture: Is it a simple broadcast (with a receiver that only goes uni-directional) or an interactive network that needs data from the upstream (with a node that goes bi-directional)?
2) Service Area: Are you connecting just one home (FTTH passive/active), a multi-dwelling unit (FTTB with high output), or a whole neighborhood (FTTC with management)?
3) Environmental Factors: Will the unit be put in a safe headend (inside) or on a pole (outside)?
4) Future-proofing: If your network is planning to use DOCSIS 4.0 or others, make sure which bandwidth the node can handle.
Using this framework guarantees the best performance and lowest cost.
35+ Years of CATV Manufacturing Expertise
Premlink – High Quality CATV Optical Node/Receiver Manufacturer in China. Works at CATV broadband for over 35 years, offers all kinds of CATV optical node/optical receivers according to customer’s request.
Key Advantages of CATV Optical Node/Optical Receiver
High bandwidth
Optical fiber transmission has considerably more bandwidth than typical coaxial cable, which means higher quality TV and quicker Internet connection speeds.
High anti-interference capability:
Because fiber optic transmission is not influenced by electromagnetic interference, it can maintain signal stability in complex electromagnetic environments.
Long transmission distance
Optical fiber has a far longer transmission distance than coaxial cable, which allows for larger cable TV signal coverage.
Low maintenance costs
Fiber optic transmission provides lower loss, which reduces signal attenuation and failure rates, lowering maintenance expenses.
Technical Insights: Key Components & Parameters
What are the key components of an optical node ?
1. PIN DIODE
2. Amplification module
3. Control Circuit
What are the three key parameters of an optical node ?
1. Input optical power
2. Output Level
3. Non-linearitry performance
For network design, it’s very important to understand these important factors:
The receiver’s sensitivity and ability to handle signals after long fiber spans or multiple splits are determined by the input optical power (usually between -6dBm and +2dBm). Output Level (measured in dBµV) determines how many homes can be served by a single node without extra amplification. FTTB/FTTC nodes need higher output levels (e.g., >100dBµV) to drive coax distribution inside buildings. Non-linearity performance (CSO/CTB) shows how much the signal is distorted.
Better parts and circuit design reduce this, making sure that the picture quality is always crystal clear, even when the channel is full. Our PL series nodes are designed to improve all three parameters at once.
Frequently Asked Questions (FAQ) about CATV Optical Node
The main difference is how they work. An optical node can send and receive data from the user, so it is bi-directional. An optical receiver only works with the downstream signal; it doesn't work with the upstream signal. In modern business language, though, the words are often used to mean the same thing.
Your choice depends on what you want to do with it and how much output you need:
A small, low-output passive or active FTTH receiver is best for one home (FTTH).
You need a higher-output node, like our PL800B, to send the signal inside a building or multi-dwelling unit (FTTB).
A high-output, managed node (like our PL3000A) is needed to cover a whole neighborhood or campus (FTTC).
Yes, of course. We provide you samples for all of our standard PL series optical nodes and receivers. This lets you check how well it works in your own network. Just click "Get a Quick Quote" and write "Sample Order" in the message.