Claims
- 1. A method of optical data transmission comprising;
receiving an optical signal having a plurality of components, each component having a different wavelength; receiving an information signal; separating a first one of the components from the optical signal; dropping a second one of the components from the optical signal; modulating the first one of the components with the information signal to obtain a modulated component; and combining the modulated component with the optical signal.
- 2. A method as in claim 1, further comprising, prior to said receiving an optical signal, using a transmitter to transmit an optical signal having the first component and the second component.
- 3. A method as in claim 2, wherein each of the components is carried within a single band centered at an ITU wavelength grid.
- 4. An add/drop device for optical data transmission comprising;
an optical waveguide configured and arranged to receive a signal having a plurality of components, each component having a different wavelength; a splitter coupled to the optical waveguide and configured and arranged to produce a first output signal and a second output signal, each output signal having the plurality of components; a first filter configured and arranged to separate a first one of the components from the first output signal; a modulator configured and arranged to modulate the first component with an information signal; a second filter configured and arranged to drop a second one of the components from the second output signal, the second one of the components being different from the first component; and a combiner configured and arranged to combine the modulated first component with the second output signal after reflection from the second filter.
- 5. An add/drop node for an optical transmission system, comprising:
an optical prefilter; a first tunable optical filter in optical communication with the optical prefilter to receive an optical signal having a continuous wave carrier signal therefrom, the tunable filter being selectively tunable to transmit a selected pass band of the optical signal and to reflect a portion of the optical signal; a modulator, configured and arranged to modulate the transmitted pass band from the first tunable filter with an information signal, the information being transmitted in a selected band; a notch filter in optical communication with the first tunable optical filter to receive the reflected portion of the optical signal and being selectively tunable to transmit the reflected portion of the optical signal after filtering the continuous wave carrier therefrom; a drop filter in optical communication with the second tunable filter and configured and arranged to transmit a selected pass band of the filtered reflected optical signal, to filter a selected band corresponding to the selected band in which the information is transmitted from the filtered reflected optical signal; and a combiner in optical communication with the drop filter and configured and arranged to accept the twice filtered reflected optical signal and the modulated transmitted pass band and to transmit an output signal.
- 6. A dense wavelength division multiplexed optical transmission system comprising:
a transmitter; an optical waveguide configured and arranged to receive an optical signal from the transmitter through the transmission line, the signal having a plurality of components, each component having a different wavelength; a splitter coupled to the optical waveguide and configured and arranged to produce a first output signal and a second output signal, each output signal having the plurality of components; a first filter configured and arranged to separate a first one of the components from the first output signal; a modulator configured and arranged to modulate the first component with an information signal; a second filter configured and arranged to drop a second one of the components, different from the first component; a combiner configured and arranged to combine the modulated first component with a signal reflected from the second filter; and a receiver in optical communication with the combiner.
Parent Case Info
[0001] This application claims priority from U.S. Provisional Patent Application Number 60/231,577, filed Sep. 11, 2000 and entitled “Optical Add/Drop Multiplexer and In-Band Wavelength Conversion”.
Provisional Applications (1)
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Number |
Date |
Country |
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60231577 |
Sep 2000 |
US |