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Single Mode Fiber Optic Cables

Part 1: Single Mode Fiber Optic: Cable Assemblies
Part 2: Single Mode Fiber Optic: Technical Section
Part 3: Category 5 TELCO Cables
 

Part 1: Single Mode Fiber Optic Cable Assemblies

We have introduced a complete line of Single Mode Fiber Optic Cable Assemblies and adapters. Call us with your specific length and connector requirements. Our expert Technical Support group will provide you with product and technical assistance for all your fiber needs.


Part 2: Single Mode Fiber Optic: Technical Section

Single mode fiber: to pull or not to pull

If you're pulling cable now, pull the single mode. The expense isn't in the cable itself but in the pulling and the electronics at the ends. I believe the basic cost of the two cables are in the same ballpark and if the money people are spending now it's easy to build a business case to support it.  Most installation people will give a price break on pulling more cable in one contract as opposed to comming back and trying to fish new innerduct through conduit or threading new cable through innerduct that's already occupied. The price drop of fiber in the future won't offset these advantages.

Single-mode fiber splicing

It is nowadays the main source of loss of a single-mode fiber link., the causes of loss at a fiber butt-joint are:

     Longitudinal gap
     Angular misalignement
     Radial misalignement
     Core excentricity
     Core ellipticity

The device used to splice, i.e. to fuse, two fiber strands, is a fiber splicer.  It consists of the following elements :

     An electric arc for the fusion
     Micromovers to adjust the relative positions
     A device to launch the light ideally at a wavelength for which the fiber is in its single-mode regime
     A device to detect the light

Today's splicing machines are able to make splices on standard telecommunication fiber with typical loss of 0.05 dB.

Single Mode Fiber: Scientific Definition
Fiber with a relatively narrow diameter, through which only one mode will propagate. Carries higher bandwidth than multimode fiber, but requires a light source with a narrow spectral width.

Single-mode optical fiber is an optical fiber in which only the lowest order bound mode can propagate at the wavelength of interest.

Note 1: The lowest order bound mode is ascertained for the wavelength of interest by solving Maxwell's equations for the boundary conditions imposed by the fiber, e.g. , core (spot) size and the refractive indices of the core and cladding.

Note 2: The solution of Maxwell's equations for the lowest order bound mode will permit a pair of orthogonally polarized fields in the fiber, and this is the usual case in a communication fiber.

Note 3: In step-index guides, single-mode operation occurs when the normalized frequency, V , is less than 2.405. For power-law profiles, single-mode operation occurs for a normalized frequency, V , less than approximately  where g is the profile parameter.

Note 4: In practice, the orthogonal polarizations may not be associated with degenerate modes. Synonyms monomode optical fiber, single-mode fiber, single-mode optical waveguide, unimode fiber.

Part 3: Category 5 TELCO Cables

25 PAIR TELCO PATCH CABLES

We manufacture and market a full line of Category 5 TELCO cable assemblies. TELCO cable assemblies are used for data and voice applications with punch down blocks and patch panels. They can also be used as extension cables. They are available in 10-Base T or AT&T 258B wiring schemes.

OCTOPUS CABLE ASSEMBLIES

Octopus cables are used to convert male or female telco connectors to either a modular or DSUB connector. Other wiring and connector configurations available. Call us with your specific length and configuration requirements.

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