Single-Wavelength Burst Mode Optical Transceiver Crosstalk Reduction
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Solution Overview
Problem
Existing optical communication systems require multiple wavelengths or fibers to avoid crosstalk and collisions, which complicates high-speed data transmission and increases costs due to the need for preamble and delimiter information.
Innovation Solution
A two-way burst mode optical communication system using a single optical fiber with transceivers at both ends communicating on a single wavelength, where only actual data is transmitted without preamble or delimiters, utilizing a partially transparent 45-degree mirror and carbon black coated absorbers to prevent crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple wavelengths or fibers are used to avoid crosstalk and collisions, then signal transmission reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements burst mode transmission where data is sent in periodic bursts rather than continuous streams. Each burst includes synchronization information that allows the receiver to identify and process data packets without requiring separate wavelengths or fibers. This periodic bursting approach enables reliable communication on a single wavelength by creating temporal separation between transmissions.
Solution Approach 2:
The patent embeds synchronization information and delimiters at the beginning of each data burst before the actual data payload. This preliminary action allows the receiver to prepare and synchronize its processing before the main data arrives, enabling reliable detection and processing without requiring complex multi-wavelength infrastructure.
2Reliability
If multiple wavelengths or fibers are used to avoid crosstalk and collisions, then communication reliability is improved, but loss of time due to handshaking protocols increases
Solution Approach 1:
The burst mode transmission sends data in periodic bursts with built-in synchronization information, eliminating the need for separate handshaking protocols. The periodic nature of the bursts with embedded timing information allows the receiver to automatically synchronize and process data without time-consuming handshaking exchanges, thus reducing time loss while maintaining reliability.
Solution Approach 2:
The patent maintains continuous transmission of data bursts without interruption for handshaking protocols. By embedding all necessary synchronization and control information within the data bursts themselves, the system eliminates idle handshaking periods and maintains continuous useful data transmission, thereby reducing time loss while ensuring reliable communication.
3Reliability
If multiple wavelengths or fibers are used to avoid crosstalk and collisions, then signal transmission reliability is improved, but equipment cost increases
Solution Approach 1:
The burst mode transmission with periodic data bursts and embedded synchronization information enables reliable communication using a single wavelength and fiber. This approach eliminates the need for expensive multi-wavelength lasers, wavelength multiplexers, and multiple fiber strands, significantly reducing equipment costs while maintaining transmission reliability through temporal separation of data packets.
Solution Approach 2:
The patent changes the transmission parameter from continuous multi-wavelength operation to periodic single-wavelength burst mode. By modulating the laser intensity in periodic bursts with embedded synchronization information, the system achieves reliable communication using simpler, less expensive single-wavelength equipment instead of complex multi-wavelength systems.
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 faster, more efficient high-speed communication by eliminating the need for handshaking protocols and reducing equipment complexity, while maintaining reliable signal transmission over long distances.
Implementation Method 1
The transceivers comprise a partially transparent 45 degree mirror which functions to deliver the transmitted optical radiation. The same partially transparent 45 degree mirror directs the received optical signal received from the optical fiber to a photocell
Implementation Method 2
Any stray radiation present due to the transmitted signal is directed to a black body cavity, which consists of two or more carbon black coated plates positioned at an angle to each other so that the stray optical noise bounces back and forth resulting in total absorption thereof
Implementation Method 3
A photocell converts the received optical signal to an electrical signal
Implementation Method 4
The transceiver comprises a light source, which may be laser or an LED emitting radiation at the selected wavelength and comprises pulse amplitude modulated light pulses
Data Source
AI summary
A digital burst mode communication system operates at a fixed wavelength for transmission and reception of burst mode signals using a pair of transceivers and a single optical cable. The stray noise level in the system is significantly reduced by use of angled plate absorbers that receive scattered transmission burst signal from a 45 degree partially reflecting mirror. Isolation of received burst signal from transmitted burst signal is increased to better than 30 dB. The system operates by sending only data bits across the single optical cable without scrambling or encoding preambles, significantly improving the efficiency of high speed communication.