Patent ID: 7340133

Claim:
A method for dispersion compensation in connection with a first spool of optical fiber having a first input end and a first output end, a second spool of optical fiber having a second input end and a second output end, a third spool of optical fiber having a third input end and a third output end, and a voltage dividing resistance ladder having a first, second, third, fourth, fifth and sixth resistance level, the method comprising: connecting the first input end to the first level, the first output end to the second level, the second input end to the third level, the second output end to the fourth level, the third input end to the fifth level, and the third output end to the sixth level; interconnecting at least tow of the first input end, first output end, second input end, second output end, third input end and third output end to form a dispersion compensation module with a variable dispersion compensation value and to set a total connection resistance of the voltage dividing resistance ladder.