Optical Transmitter Modulation Scheme Switching
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Solution Overview
Problem
Existing optical transmitters lack flexibility in changing transmission schemes and parameters, requiring separate devices for intensity modulation-direct detection and phase modulation-digital coherent detection schemes, limiting their adaptability.
Innovation Solution
An optical transmitter with a first modulation unit for intensity modulation, a second unit for phase/frequency modulation, and a modulation scheme switching unit that adapts the modulator based on the connection destination, enabling switching between these schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optical transmitters are used for intensity modulation-direct detection and phase modulation-digital coherent detection schemes, then each scheme can be optimized independently, but the device complexity increases and flexibility in changing transmission schemes is reduced
Solution Approach 1:
The optical transmitter is designed with multi-functionality to support both intensity modulation-direct detection and phase modulation-digital coherent detection schemes. The modulation scheme switching unit enables the single transmitter to adaptively select between different modulation modes (NRZ, PAM 4, PAM 8, PAM 16 for intensity modulation; QAM 4, QAM 16, QAM 64 for phase modulation) based on transmission distance and requirements, eliminating the need for separate transmitters for each scheme while maintaining optimization capabilities for both approaches
2Productivity
If the multilevel degree of modulation is adaptively changed by switching between NRZ, PAM 4, PAM 8, PAM 16 signals, then the transmission capacity is optimized for intensity modulation, but the phase modulation capability is lost
Solution Approach 1:
The optical transmitter incorporates a modulation scheme switching unit that dynamically adapts the modulation mode based on transmission distance and requirements. The system can switch between different multilevel intensity modulation modes (NRZ, PAM 4, PAM 8, PAM 16) and phase modulation modes (QAM 4, QAM 16, QAM 64) in real-time, enabling the transmitter to optimize transmission capacity for each specific scenario while maintaining versatility across different modulation schemes
3Productivity
If the multilevel degree of phase amplitude modulation is adaptively changed by switching between QAM 4, QAM 16, QAM 64 signals, then the transmission capacity is optimized for phase modulation, but the intensity modulation capability is lost
Solution Approach 1:
The modulation scheme switching unit dynamically adapts the modulation mode based on transmission distance and requirements. The system can switch between different multilevel phase modulation modes (QAM 4, QAM 16, QAM 64) and intensity modulation modes (NRZ, PAM 4, PAM 8, PAM 16) in real-time, enabling the transmitter to optimize transmission capacity for each specific scenario while maintaining versatility across different modulation schemes
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 configuration enhances the degree of freedom in changing transmission schemes and parameters, allowing a single optical transmitter to support both intensity and phase/frequency modulation schemes, improving adaptability in optical transmission.
Implementation Method 1
a first modulation unit configured to generate an optical modulated signal through intensity modulation of an optical signal
Implementation Method 2
a second modulation unit configured to generate an optical modulated signal through phase/frequency modulation of the optical signal
Data Source
AI summary
An aspect of the present invention is an optical transmitter including: a first modulation unit configured to generate an optical modulated signal through intensity modulation of an optical signal; a second modulation unit configured to generate an optical modulated signal through phase/frequency modulation of the optical signal; and a modulation scheme switching unit configured to switch a modulator of the optical signal to one of the first and second modulation units. The modulation scheme switching unit switches the modulator to a modulation unit corresponding to a device of a connection destination between the first and second modulation units.