Byte-Interleaving Multiplexing for 100G Optical Transport
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Solution Overview
Problem
Current 100 Gb/s optical transport systems are inefficient and costly, unable to meet today's bandwidth demands due to limitations in existing optical and electronic technologies, and lack standardized framing formats for interoperability.
Innovation Solution
The implementation of byte-interleaving systems and methods that multiplex sub-rate clients into 50 Gb/s logical flows, enabling forward error correction and transmission on a single wavelength, supporting evolving OTU4 and 100 G signaling formats without requiring advanced technologies, using digital circuitry and various optical modulation formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 100 G serial optical transmission is implemented using present optical and electronic technologies, then transmission capability is achieved, but spectral efficiency is poor and cost-effectiveness deteriorates
Solution Approach 1:
The patent segments the 100 G optical signal into two separate 50 G logical flows (odd columns and even columns), each transmitted independently through separate optical carriers. This segmentation allows each carrier to operate at a lower baud rate with optimized spectral efficiency, while collectively achieving 100 G transmission capacity.
2Speed
If 100 G optical transport is implemented using present technologies, then transmission is possible, but cost-effectiveness deteriorates due to lack of standardized framing formats
Solution Approach 1:
The patent creates a universal framing structure that can accommodate multiple client signal types (OTU2, OTU3, OTU4, Ethernet) and multiple transmission rates (50 G, 100 G) through a single standardized interface. This multi-functionality enables equipment to serve multiple purposes, reducing development costs and improving cost-effectiveness.
Solution Approach 2:
The patent establishes standardized framing formats and multiplexing schemes in advance, before 100 G optical transport is fully deployed. This preliminary standardization enables equipment manufacturers to develop cost-effective solutions using available technologies, rather than waiting for future technology advancements.
3Productivity
If sub-rate clients are multiplexed into 100 G logical flows, then bandwidth capacity is achieved, but device complexity increases without standardized formats
Solution Approach 1:
The patent segments the multiplexing process into manageable stages: first multiplexing sub-rate clients into 50 G logical flows using standardized formats, then combining two 50 G flows into 100 G. This segmented approach reduces device complexity by breaking down the complex 100 G multiplexing task into simpler, standardized steps.
4Speed
If 100 G transmission is implemented using present technologies, then deployment is possible, but spectral efficiency deteriorates due to baud rate limitations
Solution Approach 1:
The patent divides the 100 G transmission into two 50 G optical carriers, each operating at lower baud rates. This segmentation allows each carrier to achieve better spectral efficiency by avoiding the baud rate limitations that plague single-carrier 100 G systems, while the combined capacity still delivers 100 G throughput.
Data Source
AI summary
The present invention provides byte-interleaving systems and methods for Optical Transport Unit N (OTUN) (i.e. Optical Transport Unit 4 (OTU4)) and 100 Gb/s (100 G) optical transport enabling multi-level optical transmission. The byte-interleaving systems and methods of the present invention support the multiplexing of sub-rate clients, such as 10 Gb/s (10 G) clients, 40 Gb/s (40 G) clients, etc., into two 50 Gb/s (50 G) logical flows, for example, that can be forward error correction (FEC) encoded and carried on a single wavelength to provide useful, efficient, and cost-effective 100 G optical transport today. Signaling format support allows these two 50 G logical flows to be forward compatible with an evolving OTU4 and 100 G signaling format without waiting for optical and electronic technology advancement. Signaling format support also allows an evolving standard 100 G logical flow (i.e. OTU4, 100 Gb/s Ethernet (100 GbE), etc.) to be carried as 2×50 G logical flows, 4×25 G logical flows, or other lower rate formats on a single wavelength.