A fiber optic patch cord is a fiber optic cable capped at either end with connectors that allow it to be rapidly and conveniently connected to CATV, an optical switch or other telecommunication equipment. Its thick layer of protection is used to connect the optical transmitter, receiver, and the terminal box. Fiber optic patch cords are characterized by low insertion loss, high return loss, good repeatability, good interchange and excellent environmental adaptability.
Construction
A fiber optic patch cord is constructed from a core with a highrefractive index, surrounded by a coating with a low refractive index, that is strengthened by aramid yarns and surrounded by a protective jacket. Transparency of the core permits transmission of optic signals with little loss over great distances. The coating's low refractive index reflects light back into the core, minimizing signal loss. The protective aramid yarns and outer jacket minimizes physical damage to the core and coating.
A fiber optic patch cord is constructed from a core with a highrefractive index, surrounded by a coating with a low refractive index, that is strengthened by aramid yarns and surrounded by a protective jacket. Transparency of the core permits transmission of optic signals with little loss over great distances. The coating's low refractive index reflects light back into the core, minimizing signal loss. The protective aramid yarns and outer jacket minimizes physical damage to the core and coating.
Size
Ordinary cables measure 125 µm in diameter (a strand of human hair is about 100 µm ). The inner diameter measures 9 µm for single-mode cables, and 50/62.5 µm for multi-mode cables. The development of "reduced bend radius" fiber in the mid-2000s, enabled a trend towards smaller cables. Each unit of diameter reduction in a round cable produces a disproportionate corresponding reduction in the space the cable occupies.
Ordinary cables measure 125 µm in diameter (a strand of human hair is about 100 µm ). The inner diameter measures 9 µm for single-mode cables, and 50/62.5 µm for multi-mode cables. The development of "reduced bend radius" fiber in the mid-2000s, enabled a trend towards smaller cables. Each unit of diameter reduction in a round cable produces a disproportionate corresponding reduction in the space the cable occupies.
Classification
Patch cords are classified by transmission medium (long or short distance), by connector construction and by construction of the connector's inserted core cover. They can be classified as followings.
Patch cords are classified by transmission medium (long or short distance), by connector construction and by construction of the connector's inserted core cover. They can be classified as followings.
1. Transmission medium
According to transmission medium, fiber optic patch cord can be classified as single-mode (as the first picture below) and multi-mode (as the second picture below). Single-mode fiber is generally yellow, with a blue connector, and a longer transmission distance. Multi-mode fiber is generally orange or gray, with a cream or black connector, and a shorter transmission distance.
According to transmission medium, fiber optic patch cord can be classified as single-mode (as the first picture below) and multi-mode (as the second picture below). Single-mode fiber is generally yellow, with a blue connector, and a longer transmission distance. Multi-mode fiber is generally orange or gray, with a cream or black connector, and a shorter transmission distance.
2. Connector construction
Connector design standards include FC, SC, ST, LC, MTRJ, MPO, MU, SMA, FDDI, E2000, DIN4, and D4. Cables are classified by the connectors on either end of the cable. Some of the most common cable configurations include FC-FC, FC-SC, FC-LC, FC-ST, SC-SC, and SC-ST.
Connector design standards include FC, SC, ST, LC, MTRJ, MPO, MU, SMA, FDDI, E2000, DIN4, and D4. Cables are classified by the connectors on either end of the cable. Some of the most common cable configurations include FC-FC, FC-SC, FC-LC, FC-ST, SC-SC, and SC-ST.
3. Inserted core cover
According to the construction of the connector's inserted core cover, fiber optic patch cord can be classified into APC, UPC, and PC configuration. A UPC inserted core cover is flat and is used in SARFT and early CATV. An APC connector's inserted core cover is oblique (about 30°, ±5°). Industry standard is a minimum of – 40dB for PC back reflection measurement and – 50dB for UPC back reflection measurement. If even less back reflection is required, an APC might be necessary. An APC connector has an 8ºangle cut into the ferrule. These connectors are identifiable by their green color. An APC polished connector has an industry standard minimum of – 60dB measurement. APC fiber ends have low back reflection even when disconnected.
According to the construction of the connector's inserted core cover, fiber optic patch cord can be classified into APC, UPC, and PC configuration. A UPC inserted core cover is flat and is used in SARFT and early CATV. An APC connector's inserted core cover is oblique (about 30°, ±5°). Industry standard is a minimum of – 40dB for PC back reflection measurement and – 50dB for UPC back reflection measurement. If even less back reflection is required, an APC might be necessary. An APC connector has an 8ºangle cut into the ferrule. These connectors are identifiable by their green color. An APC polished connector has an industry standard minimum of – 60dB measurement. APC fiber ends have low back reflection even when disconnected.
Applications
Patch cables are widely used for connections to CATV (Cable Television), telecommunication networks, computer fiber networks and fiber test equipment. Applications include communication rooms, FTTH (Fiber to The Home), LAN (Local Area Network), FOS (Fiber Optic Sensor), fiber optic communication system, optical fiber connected and transmitted equipment, defense combat readiness, etc.
Patch cables are widely used for connections to CATV (Cable Television), telecommunication networks, computer fiber networks and fiber test equipment. Applications include communication rooms, FTTH (Fiber to The Home), LAN (Local Area Network), FOS (Fiber Optic Sensor), fiber optic communication system, optical fiber connected and transmitted equipment, defense combat readiness, etc.
Fiber optic patch cord plays an important role in fiber communication industry, thus getting more knowledge of fiber optic parch cord is necessary for all people in this industry. This article helps us know better of fiber optic patch cord from construction, classification, size, applications and so on.
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