40 Gbaud Trellis-Coded DP-16QAM for Flexible 400G/1T Transmission
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Solution Overview
Problem
Current 400G and 1T data transmission solutions over transoceanic distances are limited by spectral efficiencies below 6.5 b/s/Hz, requiring multicarrier implementations due to bandwidth constraints, and struggle to maintain cost-effectiveness while delivering both data rates without changing the baud-rate.
Innovation Solution
The integration of a trellis encoder/decoder into a DP-16QAM transmitter allows for two modes of operation at a fixed 40 Gbaud, using either DP16QAM or trellis-coded modulation (TCM) 16QAM, enabling flexible data transmission rates of 1T and 400G by adjusting subcarrier counts and modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multicarrier implementation is used to achieve 400G and 1T data rates, then spectral efficiency is improved, but device complexity increases due to multiple subcarriers
Solution Approach 1:
The patent changes the baud rate parameter to achieve higher data rates. By operating at 40 Gbaud instead of lower rates, the system can achieve 400G and 1T data rates with fewer subcarriers, thus reducing device complexity while maintaining high productivity
Solution Approach 2:
The patent implements dynamic adaptability between 400G and 1T modes within a single transponder design. The system can dynamically switch between different data rates without changing the baud rate, providing flexibility while maintaining a simpler overall device architecture compared to fixed designs
2Device complexity
If baud rate is increased to reduce number of subcarriers, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent creates a universal transponder design that handles both 400G and 1T data rates with the same 40 Gbaud operating rate. This multi-functionality approach eliminates the need for multiple specialized transponders, reducing overall manufacturing complexity while maintaining stable baud rate operation
Solution Approach 2:
The patent uses parameter changes in modulation schemes (DP16QAM and TCM-DP16QAM) to achieve different data rates at the same baud rate, avoiding the need to increase baud rate and its associated manufacturing precision challenges
3Ease of manufacture
If transponder design is simplified for cost reduction, then ease of manufacture is improved, but adaptability to different data rates deteriorates
Solution Approach 1:
The patent implements a universal transponder that can operate in both 400G and 1T modes using the same hardware architecture and 40 Gbaud rate. This multi-functional design achieves ease of manufacture through standardization while maintaining full adaptability to different data rate requirements
Solution Approach 2:
The transponder incorporates dynamic mode switching capability between 400G and 1T operations. The system can adaptively select the appropriate mode based on link conditions while maintaining a simple, unified hardware design, thus achieving both ease of manufacture and adaptability
Data Source
AI summary
A method of transmitting a data signal is provided that includes integrating a trellis encoder/decoder into a transmitter for 16 quadrative amplitude modulation (QAM) to provide a first and second mode of modulation, wherein each mode has a same baud rate. Data is transmitted from the transmitter at the first mode of modulation with a plurality of first subcarriers with DP16QAM modulation to provide a substantially 400G data transmission rate, or data is transmitted from the transmitter at the second mode of modulation with a plurality of second subcarriers with trellis coded modulation to provide a substantially 1T data transmission rate.