Receptacle Diplexer With Angled Ferrule For Optical Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optoelectronic transceivers face challenges in miniaturization due to size constraints, high power loss, and poor return reflection loss, especially in high-speed communication applications, where traditional designs result in increased volume and cost when attempting to improve coupling efficiency.
Innovation Solution
A pluggable bi-directional optoelectronic transceiver is designed with a ceramic ferrule having 8-degree end-face corners and a 3.8-degree optical axis deflection between the laser diode and the ferrule, eliminating the need for curled fibers and enhancing coupling efficiency by 10% to 15%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional fiber adapters (SC/PC) are used for optical connection, then the device structure is simple, but the power loss is high (0.3 dB to 0.4 dB) and return reflection loss is poor
Solution Approach 1:
The patent changes the geometric parameters of the ferrule by introducing an 8-degree end face angle instead of the traditional perpendicular or small angle design. This parameter change optimizes the optical coupling between the laser diode and fiber, reducing power loss while maintaining a simple connector structure. The specific 8-degree angle is optimized to balance coupling efficiency and return loss performance.
2Loss of energy
If curled fiber is used to resolve power reflection loss, then the return loss is improved, but the volume of the transceiver increases significantly (fiber radius must be more than 15 mm, generally 30 mm)
Solution Approach 1:
The patent changes the ferrule end face angle parameter to 8 degrees, which fundamentally alters the optical reflection characteristics. This parameter change allows the system to achieve good return loss performance without requiring curled fiber configurations, thereby avoiding the associated volume increase. The angled end face directs reflected light away from the laser diode, reducing return reflection loss in a compact form.
Solution Approach 2:
The patent extracts and eliminates the curled fiber component from the design by using the angled ferrule end face to achieve the same return loss improvement function. This removes the need for additional space-consuming elements while maintaining the desired optical performance.
3Loss of energy
If the power of the laser diode is increased to improve coupling efficiency, then the coupling efficiency is improved, but the cost increases
Solution Approach 1:
The patent changes the geometric parameters of the optical path, specifically the 8-degree end face angle of the ferrule and the 3.8-degree optical axis deflection. These parameter changes optimize the optical coupling between the laser diode and fiber, improving coupling efficiency through geometric optimization rather than increasing laser power, thereby avoiding additional manufacturing costs.
4Loss of energy
If the ceramic ferrule end angle is reduced to 6 degrees or less to improve coupling efficiency, then the coupling efficiency is improved, but the transmission stability deteriorates due to poor return loss
Solution Approach 1:
The patent optimizes the ferrule end face angle to 8 degrees, which is higher than the traditional 6 degrees or less. This parameter optimization achieves a balance between coupling efficiency and return loss performance. The 8-degree angle provides sufficient coupling efficiency while directing reflected light away from the laser diode, thereby maintaining transmission stability and reliability.
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 reduces the overall volume of the transceiver, addresses poor return loss, and improves coupling efficiency while maintaining a compact size and low cost, making it suitable for high-speed communication networks.
Implementation Method 1
the return reflection loss of the end of the optical adapter 3 is poor
Data Source
AI summary
A pluggable bi-directional optical transceiver may include: a transmitting laser diode, for transmitting an optical signal according to a received electronic signal; an optical sensor, for receiving the optical signal and for generating the electronic signal according to the received optical signal; a fiber adapter, having a ceramic ferrule with two 8-degree end-face corners; a coupling portion, having three different openings for respectively receiving the transmitting laser diode, the optical sensor, and one end of the ceramic ferrule so an optical axis of a transmitting light of the transmitting laser diode is configured to deflect about 3.8 degrees with an optical axis of the ceramic ferrule; and an engaging portion, having a hollow shell for receiving another end of the ceramic ferrule and an engaging piece surrounding outside the shell for pluggably connecting an external fiber piece.