operations of singlemode fiber cable
TRANSCRIPT
What is single mode
fiberThe term “single” in single mode does not mean 1 strand of fiber,
but rather means the coherent nature of the light rays in the core
of the glass fiber.
The core of the glass fiber has diameter measurement which
determine to some extent the behavior of the light within it.
The most common type of single mode fiber has a core
diameter of 8 to 10 μm and is designed for use in the near
infrared (the most common are 1310nm and 1550nm).
Singlemode fibers are smaller in core diameter than multimode fibers and offer much greater
bandwidth
The fiber core that is so small that only light ray at 0° incident angle can stably pass through
without much loss, is called single mode fiber.
Please note that the mode structure depends on the
wavelength of the light used,
so that this fiber actually supports a small number of
additional modes at visible wavelengths.
The basic requirement for single mode fiber is that the core
be small enough to restrict transmission to a single mode.
Single mode fiber optics operate based on the following
• Modulated laser diodes
• Pure silica glass
• Optical amplifiers
• Photo detectors
.
Advantages of Single Mode Fiber
Single mode fiber doesn’t have modal dispersion, modal noise,
and other effects that come with multimode transmission;
Single mode fiber can carry signals at much higher speeds than
multimode fibers. They are standard choice for high data rates or long distance span (longer
than a couple of kilometers) telecommunications which use laser diode based fiber optic transmission equipment
SM Fiber Types• OS1/B1.1/G.652……. Standard SM fiber for 1310nm
• OS2/B1.2/G.652……. Low water peak fiber
• OS2/B2/G.653………. Dispersion-shifted fiber
• OS2/B1.2/G.654……... Cutoff-shifted fiber
• OS2/B4/G.654………... Non-zero dispersion-shifted fiber
• OS2/B4/G.655………... Non-zero dispersion-shifted fiber
• OS2/B4/G.657………… Bend-insensitive fiber
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