Appeal 2007-2223
Application 09/975,168
2. Sharma describes optical wavelength division multiplexed
network systems based on the optical fiber ring system to be common in the
field of optical communications (col. 1, ll. 11-16).
3. Sharma discloses a multi-wavelength light source 71 shown in
Figure 6 includes a multi-mode laser 714 for emitting laser light
corresponding to a plurality of longitudinal modes at a fixed wavelength
interval, and a filter 715 for eliminating lights of unnecessary wavelengths
from the laser light output from the multi-mode laser 714 (col. 6, ll. 40-45).
4. Kartalopoulos relates to optical waveguides and describes fiber
the transporting medium of choice for voice, video, and data, particularly for
high-speed communications (p. 37, ¶ 1).
5. Kartalopoulos describes some of the properties of multimode
optical fibers as follows:
“It is easy to splice and to couple light into.
The bit rate is limited; up to 100 Mbps for lengths up to 40 km;
shorter lengths support higher bit rates.
Fiber span without amplification is limited; up to 40 km at 100
Mbps (extended to Gbps for shorter distances for graded-index).”
(P. 42, § 3.4.1).
6. Kartalopoulos describes some of the properties of single mode
optical fibers as follows:
“It is more difficult to splice and to exactly align two fibers
together.
…
It is suitable for transmitting modulated signals at 40 Gbps (or
higher) and up to 200 km without amplification.”
(P. 42, § 3.4.2).
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