Optical Transmission via Nonlinear Spectral Shift
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Solution Overview
Problem
Current passive optical networks (PONs) face challenges in cost, complexity, and security due to the need for multiple wavelengths and demultiplexers, especially in conventional PONs, and high-speed communication requirements.
Innovation Solution
A method of optical transmission using a single wavelength signal that is amplitude multiplexed and transformed into multiple wavelengths through nonlinear spectral shift, allowing each unit to receive specific wavelengths, simplifying the network architecture and enhancing security and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional PONs use time-division multiple access with a single wavelength, then device complexity is reduced, but signal attenuation increases and security concerns arise
Solution Approach 1:
The patent segments the single wavelength signal into multiple wavelength components using amplitude multiplexing and nonlinear spectral shift. Each client terminal receives a specific wavelength component, effectively dividing the transmission resource while maintaining low device complexity at the transmitter.
Solution Approach 2:
The patent changes the wavelength parameter dynamically through nonlinear spectral shift. A single wavelength signal is transformed into multiple wavelengths based on amplitude variations, allowing each client to receive a distinct wavelength without requiring multiple transmitters.
2Loss of energy
If WDM PONs allocate a specific wavelength to each subscriber, then signal attenuation is reduced and performance improves, but device complexity and cost increase due to multiple demultiplexers
Solution Approach 1:
The patent makes a single demultiplexer universal by enabling it to handle multiple wavelength components that are dynamically assigned. Instead of requiring one demultiplexer per client, a single demultiplexer serves all clients by processing the wavelength-multiplexed signal generated through nonlinear spectral shift.
Solution Approach 2:
The patent merges the functions of multiple demultiplexers into a single demultiplexer. By combining multiple wavelength components into one signal stream using amplitude multiplexing and nonlinear spectral shift, the system eliminates the need for separate demultiplexers at each client terminal.
3Adaptability or versatility
If a tunable laser switches between multiple wavelengths to address different customers, then wavelength allocation flexibility improves, but transmission speed decreases due to switching time
Solution Approach 1:
The patent uses periodic amplitude modulation of a single wavelength signal to encode multiple wavelength components. This periodic action in the time domain is transformed into wavelength domain separation through nonlinear spectral shift, eliminating the need for mechanical or electronic switching while maintaining wavelength allocation flexibility.
Solution Approach 2:
The patent replaces the mechanical or electronic switching mechanism of tunable lasers with a nonlinear optical process. Instead of physically switching wavelengths, the system uses amplitude multiplexing followed by nonlinear spectral shift to generate multiple wavelengths simultaneously, thereby eliminating switching time delays.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces costs, increases security, and simplifies the network by allowing each unit to receive specific wavelengths, improving the overall efficiency and reliability of the PON.
Implementation Method 1
the single wavelength of the light signal sent by the first unit is transformed by a nonlinear spectral shift effect into a plurality of wavelengths according to the plurality of amplitudes
Data Source
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AI summary
The invention concerns an optical transmission system and method providing for transmission of a downlink and uplink data traffic between a central terminal (15) and a plurality of client terminals (17) being interconnected by means of a passive optical access network (5), including the following steps: transmitting data borne by an amplitude-multiplexed light signal (S) comprising a plurality of amplitudes and having a single wavelength to the plurality of client terminals (17); transforming by spectral shifting, the single wavelength of said light signal (S) sent by said central terminal (15) into a plurality of wavelengths, based on the plurality of amplitudes thus forming a wavelength division multiplexed light signal, so that said data are received by said plurality of client terminals (17) based a plurality of light signals (S1,, SN) having a plurality of different wavelengths, each of said client terminals (17) receiving the data which are associated therewith based at least on one specific wavelength; and routing said downlink and uplink traffic between said central terminal (15) and the client terminals (17).