Method and arrangement for transmitting an optical OFDM-signal

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This invention describes a method and system for transmitting an optical orthogonal frequency division multiplexing (OFDM) signal using single sideband (SSB) modulation that allows for the use of direct detection at the receiver. The method efficiently encodes information in the envelope or the power of the envelope of an optical SSB signal, which enables the reduction of the required transmission bandwidth by half compared to existing approaches, while maintaining compatibility with simple, cost-effective receiver designs.

Use CasesContent extracted from patent full text and abstract with AI.

• High-speed optical communications over fiber networks, such as those used by internet service providers or data centers.
• Long-distance optical backbone networks that need to mitigate chromatic dispersion with high spectral efficiency.
• Deployment in metropolitan area networks (MANs) to boost data throughput without requiring extensive infrastructure changes.
• Upgrades to existing optical communication systems to increase capacity while minimizing changes to receiver hardware.
• Optical interconnects within and between high-performance computing clusters.

BenefitsContent extracted from patent full text and abstract with AI.

• Significant reduction in required transmission bandwidth (up to 50% savings compared to traditional offset SSB OFDM).
• Enables direct detection at the receiver, removing the need for more expensive and complex coherent detection hardware.
• Improved spectral efficiency makes better use of available fiber capacity.
• The digital processing at both transmitter and receiver simplifies system implementation and adds flexibility for upgrades.
• Enhanced robustness against chromatic dispersion in optical fibers, supporting high data rates over long distances.
• Potential for lower overall system costs due to simpler receiver design and more efficient use of optical spectrum.

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Patent Abstract

From a real valued OFDM signal (S 0 (t)) a baseband signal is (S B (t)) derived and converted into a complex single sideband modulation signal (n(t)). This signal is modulated onto an optical carrier (f OC ) to generate an SSB transmission signal (S OT ) having a small bandwidth and carrying the information in the envelope or in the power of the envelope. According to the modulation direct detection is possible. Only a small bandwidth is necessary for the transmission.