Oscillators – Automatic frequency stabilization using a phase or frequency... – With reference oscillator or source
Reexamination Certificate
2011-07-19
2011-07-19
Mis, David (Department: 2817)
Oscillators
Automatic frequency stabilization using a phase or frequency...
With reference oscillator or source
C331S025000
Reexamination Certificate
active
07982545
ABSTRACT:
An optical transmission apparatus according to the present invention connects a terminal apparatus side in which a transmission line is formed by, for example, SONET/SDH, and a WDM side in which a transmission line is formed by, for example, OTU3. The optical transmission apparatus according to the present invention includes a selector that, when an input signal is interrupted or switched, controls a PLL unit so as to switch and obtain a clock signal of a predetermined frequency oscillated by an OSC, corresponding to a frequency of a clock signal of the input signal before being divided to input into the PLL unit, as a clock signal to generate a PLL reference frequency.
REFERENCES:
patent: 6154071 (2000-11-01), Nogawa
patent: 11-355259 (1999-12-01), None
patent: 00/18013 (2000-03-01), None
Itou Sunao
Sato Tomoko
Fujitsu Limited
Fujitsu Patent Center
Mis David
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