Optical path establishing method and optical node apparatus
First Claim
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1. An optical path establishing method to establish an optical path between a first optical node and a second optical node in an optical network, the optical path establishing method comprising:
- when a modulation format of an optical signal transmitted from the second optical node is not learned in the first optical node, determining an optical path and an optical signal by transmitting and receiving information between the first optical node and the second optical node via a supervisory signal that is superimposed on the optical signal by performing frequency modulation or phase modulation on the optical signal in a first frequency bandwidth or a first phase modulation bandwidth through a modulation format different from the modulation format of the optical signal; and
optimizing transmission and reception characteristics of the optical path by transmitting and receiving information between the first optical node and the second optical node via a supervisory signal that is superimposed on the optical signal by performing frequency modulation or phase modulation on the optical signal in a second frequency bandwidth narrower than the first frequency bandwidth or a second phase modulation bandwidth narrower than the first phase modulation bandwidth through a modulation format different from the modulation format of the optical signal.
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Abstract
An optical node apparatus that establishes an optical path between a first optical node and a second optical node in an optical network include a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal, and a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal.
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6 Claims
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1. An optical path establishing method to establish an optical path between a first optical node and a second optical node in an optical network, the optical path establishing method comprising:
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when a modulation format of an optical signal transmitted from the second optical node is not learned in the first optical node, determining an optical path and an optical signal by transmitting and receiving information between the first optical node and the second optical node via a supervisory signal that is superimposed on the optical signal by performing frequency modulation or phase modulation on the optical signal in a first frequency bandwidth or a first phase modulation bandwidth through a modulation format different from the modulation format of the optical signal; and optimizing transmission and reception characteristics of the optical path by transmitting and receiving information between the first optical node and the second optical node via a supervisory signal that is superimposed on the optical signal by performing frequency modulation or phase modulation on the optical signal in a second frequency bandwidth narrower than the first frequency bandwidth or a second phase modulation bandwidth narrower than the first phase modulation bandwidth through a modulation format different from the modulation format of the optical signal. - View Dependent Claims (2, 3)
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4. An optical node apparatus that establishes an optical path between a first optical node and a second optical node in an optical network, the optical node apparatus comprising:
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a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal; and a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal, wherein the frequency modulation unit, when a modulation format of an optical signal that is transmitted and then received is not learned, sets a bandwidth of frequency modulation or a bandwidth of phase modulation to be a first frequency bandwidth or a first phase modulation bandwidth, and sets a communication speed of the supervisory signal to be a first communication speed, and wherein the frequency modulation unit, after the modulation format of the optical signal is learned, sets the bandwidth of the frequency modulation or the bandwidth of the phase modulation to be a second frequency bandwidth or a second phase modulation bandwidth, and sets the communication speed of the supervisory signal to be a second communication speed different from the first communication speed. - View Dependent Claims (5, 6)
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Specification