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​Application of CATV optical transmitters
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​Application of CATV optical transmitters

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​Application of CATV optical transmitters

The CATV optical transmitter is one of the three major components (optical transmitter, optical fiber cable and optical receiver) in the digital optical fiber system. Its function is to transform the electric pulse signal into an optical pulse signal, and then transmit the optical pulse signal from the tail fiber of the light source components with the optical pulse signal waveform required by the transmission performance of the digital optical fiber communication system. In the digital optical fiber communication system, the light emitted by the light source can be regarded as the optical frequency carrier, and its load information can be obtained through modulation, and the direct intensity modulation is generally adopted.

 

Here is the content list:

Functions that can be performed by a CATV optical transmitter

Installation and testing of CATV optical transmitters

CATV optical transmitter installation precautions

 

Functions that can be performed by a CATV optical transmitter

Before the RF signal enters the laser, it has the function of level amplification, and can display the best input level according to the number of input channels.

The temperature and output power of the laser can be kept constant.

The various working conditions of the laser are monitored and displayed on the LCD screen.

The indicator light on the front panel can indicate the abnormal alarm of the transmitter.

The RS232 interface can provide an interface for remote monitoring of the internal parameters of the CATV optical transmitter.

 

Installation and testing of CATV optical transmitters

Open the package of the CATV optical transmitter. Record the model number, serial number and associated information of the optical transmitter.

The CATV optical transmitter is fixed on a standard frame or placed on a working platform with air flow.

Clean the fiber optic connector. Gently clean the fiber connector with alcohol. The optical fiber is connected to the optical transmitter through the SC - APC or FC - APC connector. Usually, the lead wire of the optical fiber is connected to the tail fiber of the optical splitter input end, and then the SC - APC or FC - APC connector is connected to the optical transmitter. The excess tail fiber should be fixed on the top of the frame.

Connect the RF signal to the "RF IN" seat on the rear panel of the CATV optical transmitter using a 75Q coaxial cable. After the power is switched on, the optical transmitter can be tested and used.

The optical power meter measures the optical power rate directly at the connection of the optical transmitter.

 

CATV optical transmitter installation precautions

Optical connector SC - APC or FC - APC head should be cleaned before insertion, can be cleaned with alcohol before use.

When the light transmitter is working, it is not allowed to look directly at the light output port with glasses to prevent the laser from burning the eyes.

The frame must be well grounded.

When the movable connecting head is not in use, it is necessary to wear a dustproof jacket.

Do not place any object on the heat sink, so as not to affect the heat dissipation of the emitter.

When the indicator light of the transmitter appears an alarm signal, the power supply of the transmitter should be cut off immediately, and the alarm cause should be properly dealt with.

 

The function of CATV optical transmitter is to input radio frequency (RF) TV signal after modulation, output a stable optical power to transmit in CATV network.


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