TH11035A - A set of equipment for amplifying optical signals in fiber optic transmission lines. - Google Patents

Abstract

The optical signal amplification equipment for fiber optic transmission lines consists of two optical amplifiers: a fiber 2, where the optical signal is transmitted through the incoming optical fiber 3 to the amplifier, and once the signal strength is amplified, it is fed into the outgoing optical fiber 5. Optical splitters 7 and 8 are installed between the first and second optical amplifiers and the incoming and outgoing optical fibers to prevent optical signal interference between the incoming and outgoing fibers and the amplifier.

Claims (8)

1. The optical amplifier for a fiber optic transmission line consists of a highly sensitive fiber optical amplifier (2) which has one input end and one output end. The input end is intended to connect to the transmitter (4) and the output end to the receiver (16). At least one transmitter (4) and one receiver (6) are to be placed away from the amplifier (2) and connected to the amplifier by a long fiber optic cable (3,5) of such length as to which a portion of the optical signal is reflected back due to Raleigh scattering. This is characterized by the placement of an optical splitter (8,7) between the amplifier (2) and the long fiber optic cable (3,5). The splitter (8,7) allows for unidirectional transmission of light in the direction pointing from the transmitter (4) to the receiver (6). In this case, the reflectivity of the aforementioned splitter (8,7) is lower than the Raleigh scattering of the long fiber optic cable (3,5). 2. The equipment according to claim 1, herein the transmitter (4) and receiver (6) are both located away from the amplifier (2) and are connected to the amplifier by a long fiber optic cable (3,5). Equipment (1) consists of two optical splitters (8,7) located between the amplifier (2) and the long fiber optic cable (3,5). The two splitters (8,7) allow the transmission of light in one direction in the direction pointing from the transmitter (4) to the receiver (6). 3. The equipment under claim 1 or 2, herein the case of any splitter such as (8,7) shall have a reflection of at least 10 dB lower than the Raleigh scatter of a long fiber optic cable (3,5). 4. The equipment under claim 1 or 2, herein the amplifier (2) has a gain of at least 15 decibels. 5. The system of optical transmission for the transmission of optical signals consists of the equipment according to claim 2 and is further comprised of: an optical transmitter (4), an optical receiver (6) at a distance from the transmitter (4), the first optical transmission fiber (3) having the front side of the first optical transmission fiber at one end connected to the transmitter (4) and the out side of the first optical transmission fiber at the other end connected to the first splitter (8) of the two optical splitter of equipment (1), the second optical transmission fiber (5) having the out side of the second optical transmission fiber at one end connected to the receiver (6) and having the front side of the second optical transmission fiber at the other end connected to the second splitter (7) of the two optical splitter of equipment (1), here at least one of the first and second optical transmission fibers (3,5) has a length between its inlet and outlet longer than the predetermined length of the optical fiber in equipment (1), And where the optical signal applied to its input side is effectively attenuated as it travels from its input to its output side, and in such a way that a portion of the optical signal applied to the other end of one of the fibers of the first and second strands is reflected back due to Raleigh scattering. 6. The system under claim 5, herein, one filament of the first and second optical transmission lines (3,5) shall be of relative length to the length of the active fiber. 7. Under claim number 6, the length of the agile fiber is greater than the common implied distance of the optical signal. 8. An optical transmission device consisting of a fiber optic cable (3,5) and an optical amplifier (2) intended to receive and transmit optical signals, the aforementioned long optical fiber cable (3,5) is to be accompanied by Raleigh scattering of light, characterized by the aforementioned amplifier (2) with a gain greater than 15 dB, which must pass through the noise of optical interference or the difference frequency phenomenon between the usable optical signal and the noise generated by the aforementioned scattering phenomenon, and is connected to the aforementioned scattering optical fiber cable (3,5) through a unidirectional selector (7,8) placed between the aforementioned amplifier (2) and the aforementioned scattering optical fiber cable (3,5) to prevent back transmission, where the aforementioned unidirectional selector (7,8) has a reflectivity of at least 10 dB lower than the Raleigh scattering of the aforementioned back-reflecting optical fiber cable (3,5).