Multi-Channel WDM Optical Receiver With Folded Path
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Solution Overview
Problem
High-speed optical modules face challenges in reducing packaging size to accommodate increased power consumption and component density, particularly in 200G, 400G, and 800G optical interfaces, which requires innovative layout solutions to maintain PCB layout space.
Innovation Solution
A multi-channel wavelength division multiplexing optical receiving component that reflects decomposed optical signals back to a light emitting unit using a reflective light de-multiplexing unit and a reflector, allowing the light receiving unit to be positioned below the de-multiplexing unit, thereby shortening its length and optimizing PCB layout without increasing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the number of channels of light emitting components and light receiving components is doubled to increase transmission capacity, then the bandwidth and data rate are improved, but the packaging size and PCB layout area increase significantly
Solution Approach 1:
The patent transitions from a conventional linear arrangement of optical components to a folded optical path configuration using reflective surfaces. The light path is bent at angles (e.g., 45-degree mirrors) to fold the optical train, allowing components to be arranged in a compact two-dimensional footprint rather than extending linearly, thereby reducing PCB layout area while maintaining high channel count
Solution Approach 2:
The patent implements nested arrangement where multiple optical components (light sources, modulators, detectors) are stacked or layered vertically and horizontally within a compact housing. The folded optical path allows components to be nested along the bent light trajectory, maximizing space utilization and reducing the overall packaging footprint
2Area of stationary object
If the packaging size of optical components is reduced to reserve PCB layout space, then the PCB layout area is improved, but the manufacturing precision and alignment difficulty increase
Solution Approach 1:
The patent divides the optical module into distinct functional sub-assemblies (e.g., transmit section, receive section, optical bench with mounted components) that can be pre-aligned and tested separately before final integration. This modular segmentation allows precision alignment to be achieved in manageable stages rather than attempting to align all components simultaneously in a compact package
Solution Approach 2:
The patent employs preliminary alignment fixtures, precision mounting plates with定位 features, and pre-adjusted optical benches that establish accurate component positions before final assembly. Alignment marks, adjustment screws, and mechanical stops are incorporated to ensure precise positioning is achieved during assembly, compensating for the reduced tolerances inherent in compact packaging
3Volume of stationary object
If a reflective light de-multiplexing unit is used to fold the optical path, then the packaging size is reduced, but the device complexity increases
Solution Approach 1:
The patent designs the reflective optical components (mirrors, beam splitters) to perform multiple functions: wavelength division demultiplexing, path folding for compactness, and potentially polarization control or signal routing. By making components multi-functional, the number of separate elements is reduced, offsetting the apparent complexity with functional integration
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 effectively reduces the length of the light receiving unit while maintaining a similar structure and manufacturing process to conventional transmissive units, allowing for more compact packaging and improved PCB layout efficiency.
Implementation Method 1
a reflector, used for reflecting each of the second parallel lights at the light outlet of the light emitting unit
Implementation Method 2
a light de-multiplexing unit, used for de-multiplexing the first parallel light into multiple second parallel lights with a single wavelength
Implementation Method 3
the second inclined surface is provided with a first total reflection film for reflecting the first parallel light transmitted from the light inlet to the first inclined surface
Data Source
AI summary
In the technical field of optical communication a multi-path wavelength division multiplexing light receiving component including a substrate placed at the bottom of a housing is provided. The housing and substrate form an installation chamber, and include a light emitting unit, a light de-multiplexing unit, a reflector and a light receiving unit. The light emission unit, the light de-multiplexing unit, the reflector, and the light receiving unit are located inside the installation cavity, and the light emission unit, the light de-multiplexing unit, and the reflector are fixed on the housing, and the light receiving unit is fixed on the substrate. An optical module includes the multiplex wavelength division multiplexing optical receiving component. The length of the light receiving unit is shortened by reflecting an optical signal decomposed by a light de-multiplexing unit, and disposing the light receiving unit integrally below a reflector.