Appeal 2007-0490
Application 10/095,716
1 whether the “desired gain profile” is similarly limited to an amplifier with
2 only one pump.
3 FINDINGS OF FACT RELATING TO MASUDA
4 Masuda is an article discussing many types of Hybrid amplifiers
5 which make use of both Rahman and Erbium amplification. In figure 1,
6 Masuda describes several amplifier arrangements. The type 3 and type 4
7 amplifier configurations contain both amplification in one discrete amplifier.
8 In figure 1 the pump light source is denoted as a box with the letter “P.” The
9 text notes that components such as Erbium Doped Fiber (EDF) pumping
10 devices are not depicted. In the configuration for the type 3 amplifier there
11 is one pump depicted and two EDFs; for the type 4 amplifier there are two
12 pumps depicted and one EDF. The depicted pumps inject light energy
13 opposite signal propagation, i.e., in figure 1 the signal propagates left to
14 right and the pumping energy is injected right to left. As the pumping
15 energy flows from right to left it is necessarily transmitted to each fiber
16 segment to the left of the depicted pump. Thus, we find in the type 3
17 amplifier the single depicted pump injects light to the Raman Fiber segment
18 and one of the EDFs, i.e., one pump supplies energy to two segments. In the
19 type 4 amplifier, we find that the right most of the two depicted pumps
20 injects light to two Raman Fiber segments and the EDF; the other depicted
21 pump injects light into one of the Raman Fiber segments and the EDF. As
22 such we find that both the type 3 and type 4 amplifiers contain light sources
23 which pump both a Raman Fiber segment and an EDF.
24 Masuda also discusses, in paragraph 3, that the gain characteristics of
25 the hybrid amplifier are desirable to provide a wide bandwidth. In figures 2
5
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Last modified: September 9, 2013