Optical communications – Transmitter – Including compensation
Reexamination Certificate
2005-08-23
2005-08-23
Sedighian, M. R. (Department: 2633)
Optical communications
Transmitter
Including compensation
C398S194000, C398S195000, C398S199000
Reexamination Certificate
active
06934479
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.
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(“Optimization Theory with Applications” by D. Pierre, Wiley 1969 with republication by Dover in 1986, pp. 414-417.
Izumi Futoshi
Sakamoto Takeshi
Ueki Toshikazu
Li Shi K.
Sedighian M. R.
Staas & Halsey , LLP
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