Triplexer OLT 10G EPON Compatibility Compact Housing
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Solution Overview
Problem
Current 1G EPON systems are insufficient to meet the increasing demand for broadband services, necessitating a 10G EPON solution that requires compatibility with both 1.25 Gb/s and 10 Gb/s networks.
Innovation Solution
A PRX30 10G EPON-compatible optical triplexer and optical line terminal (OLT) design featuring an optical fiber, laser diodes, photodiodes, and lenses, with specific optical splitters and lenses configurations for enhanced compatibility, efficiency, and power output, housed in a compact format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a 10G EPON system is implemented to meet increasing broadband service demand, then bandwidth and service capability are improved, but compatibility with existing 1.25 Gb/s networks becomes more difficult to achieve
Solution Approach 1:
The optical line terminal is designed with multi-functionality to support both 1.25 Gb/s and 10 Gb/s EPON networks. The device integrates multiple laser diodes operating at different wavelengths (1310nm and 1550nm) and multiple photodiodes to handle both upstream and downstream transmissions at different data rates, allowing a single device to serve multiple network generations and service types including broadband internet, video broadcast, and telephony
Solution Approach 2:
The optical line terminal is segmented into distinct functional modules: separate laser diodes for different wavelengths, separate photodiodes for different reception functions, and integrated circuit boards with specific processing capabilities. This segmentation allows each module to be optimized for its specific function while maintaining overall system compatibility with both 1G and 10G networks
2Power
If optical components are arranged to achieve high power output and efficient coupling, then transmission performance is improved, but housing size increases
Solution Approach 1:
The optical components are arranged in a three-dimensional configuration rather than a simple linear or planar layout. The laser diodes and photodiodes are positioned at different spatial levels and angles, with optical lenses and splitters strategically placed to achieve efficient light coupling while minimizing the horizontal footprint of the housing
Solution Approach 2:
The optical components are nested within each other in a compact arrangement. The optical splitters are positioned to receive and redirect light paths, with lenses and detectors nested in the optical paths to achieve high power output and efficient coupling within a minimized housing volume
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
The solution enables compatibility with both 1.25 Gb/s and 10 Gb/s networks, efficient optical coupling, and high power output within a smaller housing, meeting the requirements for next-generation broadband services.
Implementation Method 1
The first optical splitter is plated or coated with a reflection increasing film and an anti-reflection film
Implementation Method 2
a first optical splitter between the first and second lenses, and a second optical splitter between the optical fiber and the second laser diode
Implementation Method 3
The first lens and the first laser diode share a first common linear optical axis, and the second lens and the second laser diode share a second common linear optical axis
Implementation Method 4
a first laser diode, a second laser diode
Implementation Method 5
a photodiode
Data Source
AI summary
An optical triplexer and/or optical line terminal (OLT) compatible with 1.25 and 10 Gb/s passive optical networks is disclosed. The triplexer/OLT includes an optical fiber, first and second laser diodes, a photodiode, and first and second lenses. A hemispherical lens may be at an end face of the photodiode or receiver subassembly housing. A first optical splitter is mounted between the first and second lenses, and a second optical splitter is mounted between the optical fiber and the second laser diode. The first lens and first laser diode, and the second lens and second laser diode share respective common linear optical axes. The present triplexer/OLT advantageously accords with an interface standard IEEE802.3av-2009 PRX30. In addition, the present triplexer can advantageously implement analog receiving and digital transceiving, save optical fiber resources, and provide high efficiency coupling. Thus, requirements for high power output and smaller housing outlines can be served.