Data processing of an optical network element
View Patent ↗A method for data processing of an optical network unit is provided, the method comprising the steps of receiving a configuration information at the optical network unit, adjusting a light signal to a wavelength or wavelength range indicated by the configuration information, demodulating an incoming optical signal by means of the light signal, mixing the demodulated incoming optical signal with a signal generated by an oscillator and generating a modulated optical upstream signal modulating the light signal by means of a software radio, so that the resulting optical upstream frequency can be shifted with respect to the frequency of the local oscillator by a programmable amount. Furthermore, an according device and a communication system are suggested comprising at least one such device.
1. A method for data processing of an optical network unit, comprising:
receiving configuration information at the optical network unit;
adjusting a light signal to a wavelength or wavelength range indicated by the configuration information;
demodulating an incoming optical signal by means of the light signal;
generating a modulated optical upstream signal by modulating the light signal by means of a software radio, wherein a digital signal processor running the software radio contains a digital up-converter stage that is configured to shift a resulting optical upstream frequency with respect to a frequency of the light signal by a programmable amount.
2. The method according to claim 1 , wherein the light signal is provided by a laser.
3. The method according to claim 1 , wherein generating the modulated optical upstream signal includes multiplying the light signal by the factor of e −2πiΔf .
4. The method according to claim 1 ,
wherein the light signal is adjusted to improve reception of the incoming optical signal and to receive the configuration information.
5. The method according to claim 1 , wherein a bandwidth of the modulated optical upstream signal is lower than a bandwidth of the incoming optical signal.
6. The method according to claim 1 , wherein the configuration information is provided by an optical line termination.
7. The method according to claim 1 , wherein the light signal used for upstream modulation is adjusted to a wavelength or wavelength range indicated by the configuration information by improving a signal-to-noise ratio.
8. The method according to claim 1 , wherein the optical network unit is a subscriber unit of a passive optical network.
9. A device, comprising;
a light source providing a light signal;
a receiver to which the light signal is fed, wherein the receiver provides an electrical output signal;
wherein the light source is adjustable to a wavelength or wavelength range provided by a configuration information received;
a modulator to which the light signal of the light source is fed to provide a modulated optical upstream signal;
a digital signal processor running a software radio configured for modulating the optical upstream signal, wherein the digital signal processor contains an up-converter stage that is configured to shift the frequency of the optical upstream signal with respect to a frequency of the light source.
10. The device according to claim 9 , wherein said device is an optical network unit.
11. The device according to claim 9 , further comprising an oscillator generating a signal and wherein the signal of the oscillator is tunable to improve a signal-to-noise ratio of an output signal of the mixer.
12. The method according to claim 1 , further comprising mixing the demodulated incoming optical signal with a signal generated by an oscillator.
13. The device according to claim 10 , further comprising an oscillator and a mixer, wherein a signal of the oscillator and the electrical output signal from the receiver are conveyed to the mixer and wherein the signal of the oscillator is tunable to improve a reception of an incoming signal at the device.