Claims
- 1. A method of operating a wavelength division multiplexed (WDM) system comprising the steps ofdetermining the transmitted power versus wavelength characteristics of the system for each wavelength used in the system; for at least one wavelength having a transmitted power level within a predetermined range, selecting a transmission data bit rate at or below a first data bit rate; and for at least one wavelength having a transmitted power level outside said predetermined range, selecting a transmission data bit rate at or below a second data bit rate, said second data bit rate being lower than the first data bit rate.
- 2. The method of claim 1 wherein for each wavelength outside said predetermined range, the data bit rate is selected so that the output power level for said each wavelength does not exceed the non-linear threshold level of transmission optical fiber used in the system.
- 3. The method of claim 1 wherein each wavelength located outside said predetermined range is in a roll-off region of the transmitted power versus wavelength characteristics of the system.
- 4. The method of claim 1 including a group of at least two wavelengths located outside said predetermined range, each wavelength of said group being modulated at a different data bit rate and wherein a wavelength in said group which is closest to the predetermined range is selected to transmit at a higher data bit rate than other wavelength located in said group.
- 5. The method of claim 1 including a plurality of wavelengths located within said predetermined range, each wavelength of said plurality being modulated at a different data bit rate and wherein a wavelength in said plurality which is closest to a wavelength located outside said predetermined range is selected to transmit at a lower data bit rate than other wavelength located in said plurality.
Parent Case Info
This application is a Divisional application of A. R. Chraplyvy 30-82; Ser. No. 09/231,033, now U.S. Pat. No. 6,580,536 Filed on Jan. 14, 1999.
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