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US 6,643,051 B1Granted
Method and system for generating return-to-zero signals
AssigneeSiemens Aktiengesellschaft
InventorsCornelius Fuerst, Harald Geiger, Reinhold Noe
Life of this patent
Estimating the term…
Abstract
For the purpose of optical transmission, narrow pulses are generated with the aid of at least two modulators (M1, M2), in which use is made of drive signals (TS1, TS2) of the same frequency with different amplitudes, the modulators having different working points.
Claims9
A method for generating RZ signals comprising:
- feeding an optimal signal to a first modulator which has at least a first operating point for a first drive signal, wherein a transmission has a maximum and the transmission has at least a minimum at peak values of a first drive signal;
- and
- feeding the optimal signal to a second modulator which has at least a second operating point which is spaced from a third operating point associated with the minimum transmission by ¼ of the spacing between the operating points associated with a maximal and neighboring minimal transmission and the second modulator is fed a second drive signal having a amplitude is selected such that its peak values lie at least approximately for driving purposes between a minimum value of the transmission and half of the maximum value of the transmission.
A system for generating RZ signals with a plurality of series-connected modulators which are fed an optical signal, comprising:
- a series circuit having at least two modulators, the modulators are fed signals having the same frequency but different effective amplitudes with a ratio of 1:4, wherein the at least two modulators have different operating points, a transmission having a maximum at one operating point, and the other operating point being selected such that the transmission has a minimum value only at a peak value of the second drive signal.
Dependencies are inferred from the claim text.