Bidirectional Optical Signal Transmission on Single Fiber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current fiber optic communication systems face inefficiencies in utilizing optic fibers, as they require multiple fibers or wavelengths for duplex communication, leading to high resource consumption and costs, with existing methods limiting the creation of duplex channels to only 8 per fiber and causing four-wave mixing interference.
Innovation Solution
The method involves transmitting optical data signals in opposite directions at the same carrier wavelength using a fiber-optical medium with passive elements and bidirectional signal dividers, measuring and reducing the overall reflected signal power to enhance signal extraction, allowing for efficient use of a single fiber for high-speed duplex communication without wavelength division.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple fibers or wavelengths are used for duplex communication, then communication reliability is improved, but fiber utilization efficiency deteriorates
Solution Approach 1:
The patent combines bidirectional communication at the same wavelength into a single fiber channel. By using bidirectional optical switches and wavelength-division multiplexing, the system merges transmit and receive paths that traditionally required separate fibers, achieving full-duplex communication over one fiber without sacrificing reliability
Solution Approach 2:
The patent introduces spatial dimensionality through bidirectional optical switching and temporal dimensionality through synchronized transmission. By controlling the direction of light propagation in different time slots and using optical circulators to separate forward and backward signals, the system enables dual-directional communication on the same wavelength within the same fiber
2Adaptability or versatility
If optical circulators are used for bidirectional transmission, then duplex communication is enabled, but device complexity and cost increase
Solution Approach 1:
The patent makes the optical circulator serve multiple functions: it acts as a directional router for bidirectional communication, a wavelength separator for WDM multiplexing, and a signal isolator to prevent interference. This multi-functionality reduces the need for separate dedicated components for each function
Solution Approach 2:
The patent introduces bidirectional optical switches as intermediary devices that control and direct optical signals between different paths. These switches mediate between the circulator and the communication channels, enabling dynamic routing and reducing the complexity of direct circulator-to-channel connections
3Power
If reflected signal power is high, then signal strength is maintained, but signal extraction accuracy deteriorates
Solution Approach 1:
The patent extracts the harmful reflected signal components from the received optical signal using optical filters and wavelength-division multiplexing. By separating the reflected signals at different wavelengths from the desired signal, the system maintains adequate signal power while removing the interfering reflections that would degrade extraction accuracy
Solution Approach 2:
The patent converts the harmful effect of reflected signals into a beneficial feature by using wavelength-division multiplexing. Reflected signals are intentionally assigned to different wavelength channels, where they can be easily separated and used for monitoring or eliminated through filtering, transforming the interference problem into a manageable resource
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 increases optic fiber utilization efficiency, improves communication channel reliability, and reduces costs by enabling the creation of high-speed distributed single fiber networks with increased channel density and reduced passive elements, achieving up to 12 times better optic fiber utilization and 11.6 times better reliability compared to conventional methods.
Implementation Method 1
An optical circulator is a fully passive device the operation principle of which is based on the effect of nonreciprocal rotation of polarization planes (the so-called Faraday Effect)
Implementation Method 2
transparent bidirectional signal dividers intended for the input/output of data signals to/from the fiber-optical line
Data Source
AI summary
This invention relates to fiber optic communication engineering and can be used in fiber optic communication systems for creating several independent communication channels.