484 Chapter 15
Vertical Cavity Surface Emitting Laser (VCSEL):
A specialized laser diode that promises to revolutionize
fiber optic communications by improving efficiency and
increasing data speed. The acronym VCSEL is pro-
nounced vixel. Typically used for the 850 nm and
1300 nm windows.
Y Coupler: A variation on the T coupler in which input
light is split between two channels (typically planar
waveguide) that branch out like a Y from the input.
Wavelength Division Multiplexing (WDM): Simulta-
neous transmission of several signals in an optical
waveguide at differing wavelengths.Window: Refers to ranges of wavelengths matched to
the properties of the optical fiber. The window ranges
for fiber optics are the following: First window, 820 nm
to 850 nm; second window, 1300 nm to 1310 nm; and
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