In-band Supervisory Data Modulation via Polarization Adjustment
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Solution Overview
Problem
In optical communication networks, existing methods struggle to efficiently modulate supervisory data without interfering with main data and without requiring additional optical components, while maintaining low power variation and minimizing effects from laser phase and frequency drift.
Innovation Solution
The method involves modulating supervisory data onto an optical signal by adjusting the polarization orientation, phase, or frequency of the carrier signal's polarization components, allowing for in-band transmission with minimal interference and no additional optical components, using techniques such as carrier polarization modulation, relative carrier phase modulation, or relative carrier frequency modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional optical components are used for supervisory data modulation, then modulation capability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by enabling the existing optical carrier signal to serve dual purposes: carrying both main data and supervisory data through polarization modulation. The same optical infrastructure and detectors are used for both functions, eliminating the need for separate optical components for supervisory data modulation.
Solution Approach 2:
The patent merges the supervisory data modulation function with the existing main data optical signal transmission. By modulating supervisory data onto the polarization state of the carrier signal already being used for main data, the system combines multiple functions into a single optical transmission path, reducing component count.
2Productivity
If high-speed modulation is used for supervisory data, then productivity is improved, but interference with main data increases
Solution Approach 1:
The patent segments the data transmission by separating main data and supervisory data onto different polarization components (e.g., horizontal and vertical polarization). This allows independent modulation and detection of each type of data, enabling high-speed supervisory data transmission without interfering with main data transmission.
Solution Approach 2:
The patent utilizes the polarization dimension of the optical signal to multiplex supervisory data alongside main data. By encoding supervisory data in the polarization state while maintaining main data in the same spatial and temporal domain, the system achieves high-speed transmission without interference through dimensional separation.
3Adaptability or versatility
If polarization modulation is used for supervisory data, then adaptability is improved, but power variation increases
Solution Approach 1:
The patent changes the polarization parameter (orientation or state) of the optical carrier to encode supervisory data, rather than changing the power or amplitude. This parameter transformation allows modulation of supervisory data without causing significant power variation in the optical signal, maintaining stable transmission.
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 enables low-speed detection of supervisory data with minimal interference to main data, reduces the need for additional optical components, and maintains low power variation, effectively addressing the challenges of supervisory data modulation in optical communication networks.
Implementation Method 1
adjusting a characteristic of a carrier of the optical signal for at least one of a first polarization component of the optical signal and a second polarization component of the optical signal based on the received supervisory data
Implementation Method 2
relative carrier phase modulation
Implementation Method 3
relative carrier frequency modulation
Data Source
AI summary
According to an aspect of an embodiment, a method of modulating supervisory data onto an optical signal includes receiving supervisory data and adjusting a characteristic of a carrier of the optical signal for at least one of a first polarization component of the optical signal and a second polarization component of the optical signal based on the received supervisory data. The characteristic may be adjusted such that there is a relative difference between the characteristic for the first polarization component and the second polarization component. The relative difference of the characteristic between the first polarization component and the second polarization component may indicate the supervisory data. Alternately, the characteristic may be adjusted such that there is a change in a polarization orientation of the carrier on a Poincaré sphere that indicates the supervisory data.