Appeal No. 96-3896
Application No. 08/152,315
The Prior Art
In Figure 2, DeLange discloses an optical
multiplexer comprising a plurality of branches 1-N, each of
which selectively isolates and modulates one of a plurality of
carrier signals F -F input at ports 1 of discriminators 11.
1 N
The modulated signals are either reflected at filters F to
rejoin the unmodulated carriers or they are separated at the
filters and combined in a separate output circuit comprising
modulators 14. A demulti-plexer (Figure 5) selectively
isolates modulated carriers by means of a network similar to
the multiplexer, and demodulates them in turn.
In Figure 4, Hepner discloses an optical multiplexer
for multiplexing two optical signals having wavelengths ë and
1
ë input at terminals 1 and 2, respectively. Filter 12 is
2
selected to transmit the signal having ë and to reflect the
2
signal having ë . The signal at 1 (ë ) passes through1 1
separator 8, the rotator 9 and half-wave plate 4. It is
reflected by filter 12, passes through plate 4, rotator 9,
separator 8, plate 6 to output
7
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