What is the principle of fiber optic telephone?

　　optical fiber telephone is a kind of telephone equipment based on optical fiber communication technology. Its principle involves many aspects, including product structure, working principle, signal conversion, etc. The following is a detailed explanation of the principle of optical fiber telephone:

　　Product structure

　　The fiber optic telephone is mainly composed of optical sending module, optical receiving module, electrical signal conversion module, optical fiber interface and telephone interface. These parts work together to realize the tranSMission and reception of telephone signals.

　　II. Working principle

　　Signal transmission:

　　When a user speaks into the microphone of a fiber optic telephone, the sound signal is first converted into an electrical signal.

　　The electrical signal is then sent to the optical transmitting module, where the laser converts the electrical signal into an optical one.

　　Optical signals are transmitted through optical fibers to remote sites.

　　Signal reception:

　　At the remote site, the optical receiving module receives the optical signal and converts it into an electrical signal.

　　The electrical signal is then sent to an electrical signal conversion module, which further processes the electrical signal into a speech signal.

　　Finally, the voice signal is output to the handset of the remote user through the telephone interface, realizing the call function.

　　III. Signal conversion process

　　The signal conversion process of fiber optic telephone mainly includes two steps: the conversion of electrical signal to optical signal and the conversion of optical signal to electrical signal. These two steps are completed by the optical sending module and the optical receiving module respectively.

　　Conversion of electrical signals to optical signals: At the transmitting end, the laser, as a key component, converts electrical signals into optical signals. This process is achieved by modulating the laser, that is, adjusting the luminous intensity of the laser according to the change in the strength of the electrical signal, thereby generating an optical signal corresponding to the electrical signal.

　　Conversion of optical signal to electrical signal: At the receiving end, the photodetector acts as a key component to convert the optical signal into an electrical signal. The photodetector can sense the change in the light intensity of the optical signal and convert it into the corresponding electrical signal output. This process is achieved by demodulating the optical signal, that is, according to the change in the strength of the optical signal, the original electrical signal is restored.

　　IV. Advantages and characteristics

　　Fiber optic telephones have the advantages of high transmission rate, low signal loss, and strong anti-interference ability. Compared with traditional copper telephones, fiber optic telephones have longer transmission distances, higher transmission rates, and more stability and Reliability. These advantages make fiber optic telephones suitable for scenarios that require high-quality communication, long-distance transmission, and high anti-interference capabilities, such as banks, hospitals, insurance companies, and other places that need to ensure communication quality, as well as remote areas, mines, and other places with poor signals.

　　To sum up, the fiber optic telephone uses fiber optic communication technology implementation of telephone communication, which has the advantages of high transmission rate, low signal loss and strong anti-interference ability. Its working principle involves many aspects such as signal transmission, signal reception and signal conversion, and works together to achieve high-quality telephone communication.