Telefonaktiebolaget Lm Ericsson (Publ)

University of California

Roberto Proietti

Fabio Cavaliere

Ernesto Ciaramella

Marco Presi

Giampiero Contestabile

Luca Giorgi

Sung-Joo Ben Yoo

Pierpaolo Ghiggino

Pallab Choudhury

Nicola Calabretta

Andrea Chiuchiarelli

The disclosed system implements a bandwidth-reconfigurable optical interconnect, which couples optical signals between N interconnect inputs and N interconnect outputs. The system includes an arrayed waveguide grating router (AWGR), which provides cyclic, single-wavelength, all-to-all routing between N AWGR inputs and N AWGR outputs. The system also includes a wavelength-insensitive switch, which provides all-wavelength, all-to-all connectivity between N wavelength-insensitive inputs and N wavelength-insensitive outputs. The system additionally includes a wavelength-selective input switch, which selectively directs up to L wavelengths from each of the N interconnect inputs into a corresponding input of the wavelength-insensitive switch, wherein unselected wavelengths from each of the N interconnect inputs pass into a corresponding AWGR input. Finally, the system includes a wavelength-selective output switch, which selectively directs up to L wavelengths from each of the N wavelength-insensitive outputs into a corresponding interconnect output, wherein each of the N AWGR outputs pass into a corresponding interconnect output.

Bandwidth-reconfigurable optical interconnect based on wavelength and spatial switching

A reflective optical network () comprises an optical network unit () and an optical receiver (). The optical network unit () comprises a reflective optical modulator () arranged to receive a seed optical signal, and a transmitter controller () arranged to receive a data signal () and to control the modulator () to apply the data signal () to the seed optical signal, to form an optical data signal. The transmitter controller () is arranged to process the data signal () to substantially prevent the optical data signal comprising spectral components at frequencies lower than a cut-off frequency, being the frequency at which a power spectral density of said optical data signal is lower than a peak power spectral density of said optical signal by a cut-off power value. The optical receiver () comprises an electrical domain high pass filter () having a cut-off frequency higher than a linewidth of the seed optical signal.

Reflective optical networks

An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least one optical fiber, a passive distribution node located remotely from the central office which has at least one input port that is coupled to the fiber and a plurality of output ports, the node being arranged to transmit a first wavelength of the N signals to at least one of its output ports, and at least one optical network unit connected through a respective optical fiber to the first output port of the passive distribution node. The passive distribution node comprises an arrayed waveguide grating which provides a passive optical connection between its input port and the first output port and which for that connection functions as a bandpass filter having a profile and bandwidth selected such that the DPSK optical signal passed to the input node is converted to an intensity modulated signal at the output port.

Optical PON network using passive DPSK demodulation

Growing community of inventors

Davis, CA, United States of America

Roberto Proietti