Fiber-to-free-space coupling

When light is incident from a fiber into free space, such as when using our fiber collimators and FiberPort collimator/couplers, the return loss

(loss of signal reflecting back to the light source at the glass-air interface at the end of the fiber) will be more severe than the equivalent fiber-to-fiber coupling

method. The return loss on FC/PC connectors can be reduced by ~8 to 10 dB by coating the fiber ends with a permeation enhancing film

and by ~2 to 5 dB on FC/APC connectors. For example, in testing, a typical return loss for a

patch cord with an uncoated connector was ~15 dB (3.16%), while the same patch cord with a permeation-enhanced connector had a return loss of ~24 dB

(0.40%). Transmission enhancement connectors also improve the transmittance of free-space beams when coupled into optical fibers. For more test data,

see the Experimental Observations tab.

Specification:

Shanghai Yogel Communication Equipment Co., Ltd. is a professional company engaged in passive optical network (PON) products, fusion splicers&accessories and fiber optic testing & maintaining tools.

We provide manufacturing, sales and services of patch cords, pigtalis, water-proof cable assemblies, fast connectors, fiber couplers or splitters, WDMs, optical adapters, fiber distribution or terminal boxes, ODF, splice closures, outside plants, indoor or outdoor fiber optic cables, FTTH drop cables, and fiber optic blowing products, including microducts, tuble bundles, microduct closures and connector accessories. Based on competitive prices, high-quality products and innovative technology, we stand apart from the rest in domestic FTTx, and cable TV broadcast industry.

We are located in Shanghai, with convenient transportation access. Dedicated to strict quality control and thoughtful customer service, our experienced staff members are always available to discuss your requirements and ensure full customer satisfaction. In recent years, our company develops a series of advanced equipment used in central office, that is, Optical Line Terminals (OLTs), Optical Network Units (ONUs) in broadband internet area and Optical Transmitters, 1550nm EDFAs, Optical Nodes in Cable TV multi-system platform. Otherwise, we present products of fiber optic testing & maintaining tools including Single Fiber Fusion Splicers, Fiber Cleavers, Cable Slitters, Fiber Cleaners, Splice Protection Sleeves, Single or Ribbon Fiber Mechanical Splicers, PON Power meters, Light Sources, VFLs, Fiber Identifiers and OTDRs. That help us assembling a superior team of highly talented engineers. With these people, we can design and provide all range of solutions and production services in optical access networks or "The Last Miles".

In addition, we have obtained ISO9001, SGS, the State Administration of Radio, Film & TV network access for broadcast equipment certificates and carry out IEC and CE standard strictly. In many cities and provinces around China, our products are widely used in Telecom, CATV, and all kinds of optical communication network. We also welcome OEM and ODM orders. Customized, Individual requirements and Samples are available. Whether selecting a current product from our catalog or seeking engineering assistance for your application, you can talk to our customer service center about your sourcing requirements. They will never disappoint you.

With Yogel, you will get more. We sincerely welcome friends from all over the world to visit our company and cooperate with us on the basis of long-term mutual benefits.