A patch cord or patch cable is an optical or electrical cable which is used to connect one optical or electronic device. Connected devices such as a miniature spectrometer to another for signal routing. Devices of different types are connected with a patch cable. Patch cord is also known as patch lead. The term patch cord is sometimes used as well, but it's often associated more with non-network types of cables such as those for wiring stereo components. The term "patch" came from early use in radio studios and telephony studios. Extra equipment kept on standby could be temporarily substituted for failed devices which came from early use in radio studios and telephony studios. This cord is a key player for indoor use, like in server rooms or in data centers. It is known for its superior adaptability and improved security, featuring excellent reliability, this cord has ranked the best choice for applications where conventional copper cables fail to reach.
Figure 1: Patch Cord- an optical or electrical cable
A patch cable is normally made of coaxial cabling, but it also could consist of fiber optic, shielded or unshielded CAT5/5e/6/6A, or single-conductor wires. A patch cable always has connectors on both ends, which means it's not as permanent of a solution as some cables like pigtails or blunt patch cables. These are similar to patch cables but have exposed bare wires on one end that is meant to be connected directly and permanently to a terminal or other device.
Figure 2: Patch Cords used for superior adaptability, improved security and excellent reliability
There are many different kinds of patch cables. The most common are CAT5/CAT5eethernet cables linking a computer to a nearby network switch, hub, or router, a switch to a router, etc.
A lensed patch cord or patch cable probe has been made with a ball lens packaged in a metal cylinder. Optical coherence tomography could be implemented by simply placing a ball lens directly in front of a fiber patch cable, potentially disposable sampling probe and a compact. To achieve a sufficiently long working distance and a good transverse resolution at the same time, the proper ball lens diameter and the distance between the ball lens and the fiber patch lead were investigated. Experimentally, sometime a working distance that up to 5.2 mm, 3 dB bandwidth of 2 mm, and the transverse resolution of 16 μm were achieved. With the patch lead probe, a common path swept-source OCT system was implemented and used to demonstrate the feasibility as the dedicated probe for dentistry.
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