Appeal No. 96-3896
Application No. 08/152,315
terminal 3. The signal at 2 (ë ) passes through filter 12 and
2
takes the same path as ë to output terminal 3.
1
For demultiplexing, two carrier signals having
wavelength ë and ë are input at terminal 1. These signals1 2
pass through separator 8, rotator 9 and the half-wave plate 4.
Filter
12 reflects the carrier wavelength ë and transmits the
1
carrier wave of ë to line 2. The carrier signal of wavelength
2
ë is thus obtained at the output end of the filter on line 3.
1
When reflected, carrier ë is passed back through the half-
1
wave plate 4 and the rotator 9. The separator 8 deflects the
signal, which then passes through half-wave plate 6 to output
line 3.
Glomb teaches optical communication devices
utilizing Bragg grating elements. As illustrated in Figure 2,
such elements have wide frequency pass bands on each side of a
narrow reflection band 22.
8
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Last modified: November 3, 2007