WDM-PON Reflective Amplifier for Passive Optical Network
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Solution Overview
Problem
Deploying reliable and cost-effective fiber-to-the-premises (FTTP) network infrastructure is challenging due to the need for power supply in uncontrolled outdoor environments and complex management of geographically dispersed communications links, which increases installation and maintenance costs.
Innovation Solution
A wavelength division multiplexed passive optical network (WDM-PON) system that uses a central optical system to generate and modulate laser beams for downstream and upstream data transmission, employing reflective semiconductor optical amplifiers to reduce the need for stabilized laser transmitters at customer premises and minimize equipment costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fiber optic cables are deployed to customer premises in uncontrolled outdoor environments, then bandwidth and transmission speed are improved, but power supply reliability and equipment stability deteriorate
Solution Approach 1:
The patent employs passive optical network (PON) technology where the optical line terminal (OLT) at the service provider end actively manages and controls the entire network. The customer premises equipment (CPE) operates passively without requiring local power supply or active components, eliminating the need for power supply in uncontrolled outdoor environments while maintaining high-speed fiber optic transmission.
2Quantity of substance
If fiber optic cables are deployed to customer premises, then communication bandwidth is improved, but installation and maintenance complexity increase
Solution Approach 1:
The patent segments the optical network into two distinct parts: the active service provider end with the optical line terminal (OLT) that handles all complex management functions, and the passive customer end with simple optical network units (ONUs). This segmentation centralizes complexity at the service provider end while keeping customer premises equipment simple and easy to deploy, reducing installation and maintenance complexity despite high bandwidth capabilities.
3Reliability
If stabilized laser transmitters are installed at customer premises, then data transmission reliability is improved, but equipment cost and installation complexity increase
Solution Approach 1:
The patent extracts the laser transmitter function from the customer premises equipment and relocates it to the service provider's optical line terminal. The CPE only requires simple optical detectors to receive signals, eliminating the need for expensive stabilized laser transmitters, wavelength controllers, and other complex components at customer locations, thereby significantly reducing equipment cost and installation complexity while maintaining transmission reliability through centralized control.
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 WDM-PON system provides efficient, low-cost bi-directional high-bandwidth communication by reusing downstream optical carriers for upstream data, reducing the need for active components in outdoor nodes and lowering installation and maintenance costs while ensuring reliable data transmission.
Implementation Method 1
The second split laser beam is transmitted to a reflective semiconductor optical amplifier, which modulates the second split laser beam with upstream data
Implementation Method 2
The laser beam modulated with upstream data is reflected by the reflective semiconductor optical amplifier and transmitted to an optical receiver in the central optical system
Implementation Method 3
The first optical beam is sent to a first optical receiver, which demodulates the first downstream data
Data Source
AI summary
Data is transmitted between a central office and customer premises by a wavelength division multiplex passive optical network. Two laser beams with separate wavelengths are transmitted from the central office to an optical network unit in the customer premises. Both laser beams carry downstream data. One laser beam is intensity modulated by on/off keying. The other laser beam is phase modulated by differential phase shift keying, which maintains a constant optical intensity. The first laser beam is received by a first optical receiver, which demodulates the first downstream data. The second laser beam is split in two. One laser beam is sent to a second optical receiver, which demodulates the second downstream data. The other laser beam is sent to a reflective semiconductor amplifier, which modulates the beam with upstream data and transmits the beam back to a receiver in the central optical system.