Optical access network
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsErnesto Ciaramella, Marco Presi
Life of this patent
Estimating the term…
Abstract
An optical access network comprises an optical network unit having a first port for connecting to a first optical link, a second port for connecting to a second optical link and an optical source. The optical source is arranged to generate a first optical signal, to transmit the first optical signal via the first port, to receive an optical seed signal via the first port and to amplify the optical seed signal. The optical seed signal has a narrower bandwidth compared to the first optical signal. A modulator is arranged to modulate the amplified optical seed signal with upstream data to form an upstream optical signal and to transmit the upstream optical signal via the second port. A polarisation modifier can modify polarisation of the first optical signal.
Claims12
A wavelength router apparatus for an optical access network comprising:
- a first port for connecting to a first optical link to an optical network unit (ONU);
- and
- a second port for connecting to a polarisation modifier,
- wherein the wavelength router apparatus is arranged to:
- receive a first optical signal via the first port,
- forward the first optical signal via the second port to the polarisation modifier,
- receive a polarisation modified optical signal from the polarisation modifier via the second port, wherein the polarisation modified optical signal has a different polarization compared to the first optical signal,
- filter the polarisation modified optical signal to form an optical seed signal, and
- output the optical seed signal via the first port.
A method in a wavelength router in an optical access network comprising:
- receiving a first optical signal via a first port of the wavelength router;
- forwarding the first optical signal via a second port of the wavelength router to a polarisation modifier;
- receiving a polarisation modified optical signal from the polarisation modifier via the second port, wherein the polarisation modified optical signal has a different polarization compared to the first optical signal;
- filtering the polarisation modified optical signal to form an optical seed signal;
- and
- outputting the optical seed signal via the first port.
Dependencies are inferred from the claim text.