Optical Network Element With Dielectric Filter Angle Multiplexing
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Solution Overview
Problem
Existing optical systems face interference and frequency instability due to discrete laser sources with varying frequency distances, especially when closely spaced, which is exacerbated by temperature effects, leading to degraded performance in high-density wavelength division multiplexing applications.
Innovation Solution
An optical network element comprising lasers with dielectric filters arranged within their resonators, where light enters at different angles, providing spectrally separated wavelengths that are resilient to temperature variations, utilizing a single dielectric filter for multiple lasers and a photonic motherboard for precise frequency adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple discrete laser sources are used to provide closely spaced wavelengths, then the system can achieve high data rates and dense wavelength division multiplexing, but the laser sources interfere with each other and exhibit frequency instability due to temperature effects
Solution Approach 1:
The patent merges multiple laser sources and a single dielectric filter into an integrated photonic motherboard structure. Multiple laser sources are positioned to illuminate the same dielectric filter at different angles, combining their functions while maintaining spectral separation. This integration reduces the harmful interference and frequency drift issues that occur with discrete, separately positioned laser sources.
Solution Approach 2:
The patent changes the spatial parameter (illumination angle) to differentiate the function of each laser source. By directing light from different laser sources at different angles through the same dielectric filter, the system achieves wavelength multiplexing without requiring physically separated components. This parameter change enables frequency stability while maintaining high data transmission rates.
2Quantity of substance
If multiple discrete laser sources are closely spaced to achieve dense wavelength division multiplexing, then channel capacity increases, but interference between laser sources increases and frequency control becomes more difficult
Solution Approach 1:
The patent introduces a spatial dimension (illumination angle) to differentiate between multiple wavelength channels. Instead of relying solely on frequency separation, the system uses angular diversity to route different wavelength channels through the same dielectric filter without interference. This dimensional change allows dense wavelength packing while eliminating the harmful interference that plagues conventional closely-spaced laser systems.
Solution Approach 2:
The dielectric filter serves as an intermediary element that mediates between multiple laser sources and the optical fiber. It selectively transmits different wavelengths based on illumination angle, acting as a mediator that prevents direct interference between laser sources while enabling dense wavelength multiplexing. This intermediary component resolves the contradiction between high channel capacity and low interference.
3Adaptability or versatility
If conventional WDM systems use multiple discrete laser sources, then bidirectional communication over single fiber is enabled, but the system complexity and alignment requirements increase
Solution Approach 1:
The dielectric filter performs multiple functions simultaneously: it acts as a wavelength selector, a spatial beam combiner, and a frequency stabilizer. By making this single component multi-functional, the patent reduces the overall system complexity that would otherwise require multiple separate alignment-critical components. The universal dielectric filter enables bidirectional communication while minimizing alignment requirements.
Solution Approach 2:
The patent combines wavelength selection, beam combining, and frequency stabilization functions into a single integrated photonic motherboard structure. This merging of functions reduces the number of independent alignment interfaces compared to conventional systems that use separate discrete components for each function, thereby reducing overall system complexity while maintaining bidirectional communication capability.
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 configuration efficiently generates light beams with precise spectral separation, maintaining frequency stability even under temperature changes without additional locking mechanisms, enabling efficient operation in dense WDM systems like NGOA with improved data transmission rates.
Implementation Method 1
for each laser, light in the resonator enters the dielectric filter at a predetermined angle, wherein the light generated within each laser enters the dielectric filter at a different angle
Data Source
Figure 1
AI summary
An optical network element is provided, comprising several lasers, wherein at least one dielectric filter is arranged within an least one resonator of the lasers, wherein for each laser, light in the resonator enters the at least one dielectric filter at a predetermined angle and wherein the light generated within each laser enters the at least one dielectric filter at a different angle. Furthermore, a process of manufacture and a method for generating several light beams by several lasers are suggested.