Wavelength division multiplexing optical communication system and wavelength division multiplexing optical communication method
First Claim
1. A wavelength division multiplexing optical communication system for transmitting wavelength division multiplexed signal light containing a plurality of optical signals of different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path, wherein said receiving terminal station comprises reception characteristics measurement means for measuring reception information including optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path, and reception information transmission means for transmitting the reception information about each wavelength measured by said reception characteristics measurement means to said transmitting terminal station, and said transmitting terminal station comprises pre-emphasis performing means for performing pre-emphasis on the wavelength division multiplexed signal light transmitted along said optical transmission path, chirp applying means for applying an optical wavelength chirp to the wavelength division multiplexed signal light transmitted along said optical transmission path, and control means for controlling, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis in said pre-emphasis performing device, and the setting of a parameter (x representing an amount of the optical wavelength chirp in said chirp applying means.
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Accused Products
Abstract
The object of the present invention is to provide a WDM optical communication system and a WDM communication method wherein deviation of transmission characteristics of optical signals of respective wavelengths is reliably controlled, based on reception information such as the OSNR, BER and the like measured at the receiving end, thereby enabling optimal transmission conditions to be realized. For this purpose, the present WDM optical communication system transmits WDM signal light of wavelengths λ1˜λn, which has been generated by the transmitting end of one terminal station, to the receiving end of the other terminal station through an optical transmission path. At the receiving end, the OSNR and BER of the optical signals of wavelengths λ1˜λn are measured, and the result is superimposed on overhead information transmitted along the opposing line of the optical transmission path as reception information. At the transmitting end, the settings of pre-emphasis and a parameter α are feedback controlled based on the reception information about each wavelength transmitted, and deviation of transmission characteristics of respective wavelengths is thus suppressed.
199 Citations
17 Claims
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1. A wavelength division multiplexing optical communication system for transmitting wavelength division multiplexed signal light containing a plurality of optical signals of different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path, wherein
said receiving terminal station comprises reception characteristics measurement means for measuring reception information including optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path, and reception information transmission means for transmitting the reception information about each wavelength measured by said reception characteristics measurement means to said transmitting terminal station, and said transmitting terminal station comprises pre-emphasis performing means for performing pre-emphasis on the wavelength division multiplexed signal light transmitted along said optical transmission path, chirp applying means for applying an optical wavelength chirp to the wavelength division multiplexed signal light transmitted along said optical transmission path, and control means for controlling, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis in said pre-emphasis performing device, and the setting of a parameter (x representing an amount of the optical wavelength chirp in said chirp applying means.
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10. A wavelength division multiplexing optical communication method for transmitting a wavelength division multiplexed optical signal, containing a plurality of optical signals of different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path, wherein
in said receiving terminal station, reception information including an optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path is measured, and the measured reception information about each wavelength is transmitted to said transmitting terminal station, and in said transmitting terminal station, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis to be performed on the wavelength division multiplexed signal light transmitted along said optical transmission path and the setting of a parameter α - representing an amount of the optical wavelength chirp applied to the wavelength division multiplexed signal light transmitted along said optical transmission path are respectively controlled
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11. A wavelength division multiplexing communication system for transmitting wavelength division multiplexed signal light containing a plurality of optical signals of different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path and an optical repeater station, wherein
said receiving terminal station comprises reception characteristics measurement means for measuring reception information including an optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path, and reception information transmission means for transmitting the reception information about each wavelength measured by said reception characteristics measurement means to said transmitting terminal station, said transmitting terminal station comprises pre-emphasis performing means for performing pre-emphasis on the wavelength division multiplexed signal light transmitted along said optical transmission path, control means for controlling, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis in said pre-emphasis performing means, and reception information transfer means for transferring the reception information about each wavelength transmitted from said receiving terminal station to said optical repeater station, and said optical repeater station comprises optical amplification means containing a Raman amplifier for Raman amplifying the wavelength division multiplexed signal light transmitted from said optical transmission path, and Raman amplification control means for controlling a supply condition of Raman excitation light in said Raman amplifier corresponding to the reception information about each wavelength transmitted from said transmitting terminal station.
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16. A wavelength division multiplexing optical communication method for transmitting a wavelength division multiplexed optical signal containing a plurality of optical signals with different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path and an optical repeater station, wherein
in said receiving terminal station, reception information including an optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path is measured, and the measured reception information about each wavelength is transmitted to said transmitting terminal station, in said transmitting terminal station, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis to be performed on the wavelength division multiplexed signal light transmitted along said optical transmission path is controlled, and the reception information about each wavelength transmitted from said receiving terminal station is transferred to said optical repeater station, and in said optical repeater station, depending on the reception information about each wavelength transmitted from said transmitting terminal station, a supply condition of Raman excitation light for Raman amplifying the wavelength division multiplexed signal light transmitted through said optical transmission path is controlled.
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17. A wavelength division multiplexing optical communication system for transmitting a wavelength division multiplexed optical signal containing a plurality of optical signals with different wavelengths, from a transmitting terminal station to a receiving terminal station via an optical transmission path and an optical repeater station, wherein
said receiving terminal station comprises reception characteristics measurement means for measuring reception information including an optical signal to noise ratio and a transmission error rate for the optical signals of respective wavelengths transmitted through said optical transmission path, and reception information transmission means for transmitting the reception information about each wavelength measured by said reception characteristics measurement means to said transmitting terminal station, said transmitting terminal station comprises pre-emphasis performing means for performing pre-emphasis on the wavelength division multiplexed signal light transmitted along said optical transmission path, chirp applying means for applying an optical wavelength chirp to the wavelength division multiplexed signal light transmitted along said optical transmission path, control means for controlling, depending on the reception information about each wavelength transmitted from said receiving terminal station, the setting of pre-emphasis in said pre-emphasis performing means, and the setting of a parameter α - representing an amount of the optical wavelength chirp in said chirp applying means, and reception information transfer means for transferring the reception information about each wavelength transmitted from said receiving terminal station to said optical repeater station, and
said optical repeater station comprises optical amplification means containing a Raman amplifier for Raman amplifying the wavelength division multiplexed signal light transmitted from said optical transmission path, and Raman amplification control means for controlling a supply condition of Raman excitation light in said Raman amplifier corresponding to the reception information about each wavelength transmitted from said transmitting terminal station.
- representing an amount of the optical wavelength chirp in said chirp applying means, and reception information transfer means for transferring the reception information about each wavelength transmitted from said receiving terminal station to said optical repeater station, and
Specification