Methods and apparatus for reducing four-wave mixing
AssigneeCorning Incorporated
InventorsAleksandra Boskovic, Valeria Loureiro da Silva, Sergey Yurevich Ten
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Abstract
Four-wave mixing of transmitted signals in a lightwave transmission system is reduced by (1) grouping the signals in pairs of adjacent frequencies, (2) increasing the frequency of every other pair by a fixed amount, and (3) decreasing the frequency of the remaining pairs by the same fixed amount, where the fixed amount is less than the permitted variation of the ITU grid.
Claims20
A method of operating a lightwave transmission system which transmits a plurality of signals at nominal frequencies separated from one another by a nominal frequency spacing .DELTA.F, said method comprising:
- (a) grouping said nominal frequencies from lowest nominal frequency to highest nominal frequency in pairs of adjacent nominal frequencies;
- (b) increasing the frequency of every other pair by .DELTA..nu.;
- and
- (c) decreasing the frequency of the remaining pairs by .DELTA..nu.';
- where .DELTA..nu. and .DELTA..nu.' are both less than .DELTA.F and at least one of .DELTA..nu. and .DELTA..nu.' is greater than zero.
A method of operating a lightwave transmission system which transmits a plurality of signals at nominal frequencies separated from one another by a nominal frequency spacing .DELTA.F, said method comprising:
- (a) ordering said nominal frequencies from lowest nominal frequency to highest nominal frequency;
- (b) increasing every other frequency by .DELTA..nu.;
- and
- (c) decreasing the remaining frequencies by .DELTA..nu.';
- where .DELTA..nu. and .DELTA..nu.' are both less than .DELTA.F and at least one of .DELTA..nu. and .DELTA..nu.' is greater than zero.
A lightwave transmission system comprising a plurality of light sources, wherein said light sources:
- (A) operate at nominal frequencies separated from one another by a nominal frequency spacing .DELTA.F;
- and
- (B) are grouped from lowest nominal frequency to highest nominal frequency in pairs of adjacent nominal frequencies wherein:
- (i) the frequency of every other pair is increased by .DELTA..nu.;
- and
- (ii) the frequency of the remaining pairs is decreased by .DELTA..nu.';
- where .DELTA..nu. and .DELTA..nu.' are both less than .DELTA.F and at least one of .DELTA..nu. and .DELTA..nu.' is greater than zero.
A lightwave transmission system comprising a plurality of light sources, wherein said light sources:
- (A) operate at nominal frequencies separated from one another by a nominal frequency spacing .DELTA.F;
- (B) are ordered from lowest nominal frequency to highest nominal frequency;
- (C) have the frequency of every other light source increased by .DELTA..nu.;
- and
- (D) have the frequency of the remaining light sources decreased by .DELTA..nu.';
- where .DELTA..nu. and .DELTA..nu.' are both less than .DELTA.F and at least one of .DELTA..nu. and .DELTA..nu.' is greater than zero.
Dependencies are inferred from the claim text.