Optical Module Focusing Lens Enhances Coupling Efficiency
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Solution Overview
Problem
In optical communication systems, there is a challenge in achieving efficient interconversion between optical signals and electrical signals over long distances, particularly due to the need for high photoelectric conversion rates and improved optical coupling efficiency, which is hindered by the shrinking photosensitive surface area of light-receiving chips.
Innovation Solution
The optical module incorporates a light-receiving device with a focusing lens opposite to the photosensitive surface of the light-receiving chip, which converges optical signals from the optical fiber ribbon onto the chip, enhancing optical coupling efficiency and supporting high-speed signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-receiving chip with a photosensitive surface is used to receive optical signals, then photoelectric conversion can be achieved, but the photosensitive surface area is shrinking which reduces optical coupling efficiency
Solution Approach 1:
A focusing lens is introduced as an intermediary component between the optical fiber and the light-receiving chip. The lens concentrates the optical signal from the fiber onto the photosensitive surface, compensating for the reduced surface area and maintaining high optical coupling efficiency despite the shrinking chip size.
Solution Approach 2:
The patent changes the optical parameters by introducing a focusing lens with specific focal length and aperture characteristics. This parameter change allows the optical system to maintain high coupling efficiency by concentrating light energy onto the smaller photosensitive surface, effectively decoupling the relationship between chip size and conversion efficiency.
2Length of stationary object
If optical signals are transmitted over long distances, then communication range is extended, but signal quality deteriorates due to attenuation and dispersion
Solution Approach 1:
The focusing lens acts as an optical intermediary that minimizes signal loss at the reception interface. By ensuring maximum light collection efficiency onto the photosensitive surface, the lens helps preserve signal quality even after long-distance transmission through the optical fiber.
Solution Approach 2:
The optical module is pre-configured with the focusing lens positioned at the optimal focal distance from the light-receiving chip. This preliminary arrangement ensures that incoming optical signals are immediately focused onto the photosensitive surface upon entry, maximizing conversion efficiency and maintaining signal integrity before further processing.
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 improves the optical coupling efficiency and supports high-speed signal transmission, enabling efficient interconversion of optical and electrical signals over long distances, thus addressing the limitations of existing technologies.
Implementation Method 1
The focusing lens is disposed opposite to the photosensitive surface of the light-receiving chip and is configured to converge light transmitted by the optical fiber ribbon to the photosensitive surface of the light-receiving chip
Implementation Method 2
the light-receiving chip generates a current signal by virtue of a photoelectric conversion effect
Data Source
AI summary
An optical module includes a shell, a circuit board, a light-receiving device and an optical fiber ribbon. The circuit board is located in the shell. The light-receiving device is disposed on the circuit board and is electrically connected to the circuit board. An end of the optical fiber ribbon is connected to the light-receiving device. The light-receiving device includes a light-receiving chip and a focusing lens. The light-receiving chip is disposed on a surface of the circuit board and has a photosensitive surface. The focusing lens is disposed opposite to the photosensitive surface of the light-receiving chip, and is configured to converge light transmitted by the optical fiber ribbon to the photosensitive surface of the light-receiving chip.