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US 6,271,922 B1Granted
Transmission system and associated method for measuring interference effects of glass fiber transmission links
AssigneeAlcatel
InventorsHenning Bülow, Harald Schmuck
Life of this patent
Estimating the term…
Abstract
A method for measuring interference effects on a glass fiber transmission link produced by polarization mode dispersion, whereby an optical light source feeds a side band modulated signal into the transmission link, the signal is transmitted and at a coherent receiver the signal is evaluated at a frequency corresponding to the modulation frequency of the side band modulated signal.
Claims15
A transmission system comprising:
- a glass fiber transmission link;
- an optical sender comprising a light source for supplying two signals of different frequencies to said transmission link, and
- a coherent optical receiver for coherently detecting and evaluating said two signals at a frequency (f) which corresponds to a difference between the frequencies of said two signals, to thereby measure interference effects on said transmission link caused by polarization mode dispersion.
A measurement method, comprising:
- (a) coupling two signals of an optical light source into a glass fiber transmission link, wherein the two signals have different frequencies;
- (b) transmitting the two signals to a coherent receiver via the glass fiber transmission link;
- and
- (c) at the coherent receiver, evaluating a further signal to determine interference effects on the glass fiber transmission link, wherein the interference effects are caused by polarization mode dispersion of the two signals and wherein a frequency of the further signal corresponds to a difference between the different frequencies of the two signals.
1 more element
A method for transmitting data, comprising:
- (a) at least in predetermined time intervals, generating two signals by an optical sender, wherein the optical sender is connected to at least one modulator;
- (b) coherently superimposing the two signals to generate a coherently superimposed signal whose frequency corresponds to a frequency difference between the two signals;
- and
- (c) at a coherent receiver, measuring a power of the coherently superimposed signal to determine interference effects caused by polarization mode dispersion of the two signals and to calibrate a transmission system.
1 more element
A measurement method, comprising:
- (a) generating a first signal and a second signal having a first frequency and a second frequency, respectively;
- (b) transmitting the first signal and the second signal;
- and
- (c) evaluating a third signal having a third frequency, which corresponds to a difference between the first frequency of the first signal and the second frequency of the second signal, to determine interference effects caused by polarization mode dispersion of the two signals.
1 more element
A determination method, comprising:
- (a) transmitting a first signal and a second signal from a source to a receiver via a transmission link, wherein the first signal has a first frequency and the second signal has a second frequency;
- (b) at the receiver, coherently detecting the first and the second signal and outputting a third signal whose frequency corresponds to a difference between the first frequency of the first signal and the second frequency of the second signal;
- and
- (c) measuring a power of the third signal to determine interference effects on the transmission link, which are caused by polarization mode dispersion of the first signal and of the second signal.
1 more element
Dependencies are inferred from the claim text.