Free Space Isolator Fixture Using Segmented Epoxy Bonding
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Solution Overview
Problem
High performance semiconductor lasers in optical communication systems are adversely affected by reflections, leading to fluctuations and noise, and existing optical isolators in free space designs are prone to undesirable positional changes due to temperature and humidity effects.
Innovation Solution
A free space isolator design that uses a glass base with a small amount of epoxy to secure the optical isolator element, reducing unwanted reflections and positional changes by employing a fixture to create a stable and reliable configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a small amount of epoxy is used to secure the optical isolator element, then the positional stability is improved, but the adhesive strength may be insufficient
Solution Approach 1:
The bonding process is segmented into two distinct stages: first applying a minimal amount of epoxy for initial positioning, then adding a second epoxy layer for structural reinforcement. This segmentation allows the first layer to establish precise optical alignment while the second layer provides the necessary bonding strength without compromising the positional stability achieved in the first stage.
2Ease of manufacture
If epoxy is used to connect components, then the components are joined together, but temperature and humidity cause the epoxy to shrink or expand creating positional changes
Solution Approach 1:
The optical isolator element is positioned and aligned in the first epoxy layer before the epoxy fully cures, establishing the correct optical path. This preliminary positioning action ensures that even when the second epoxy layer is added and environmental changes occur, the element maintains its precise orientation because the first layer has already locked in the critical alignment.
Solution Approach 2:
The invention changes the bonding parameters by using two different epoxy layers with different functions: the first layer uses epoxy with lower viscosity for precise positioning, while the second layer uses epoxy optimized for structural strength and environmental stability. This parameter change allows the system to accommodate thermal expansion and humidity effects without compromising positional accuracy.
3Productivity
If high performance semiconductor lasers are used, then transmission rates increase, but reflections cause fluctuations and noise in laser operation
Solution Approach 1:
The invention extracts and removes reflected light from the optical path using a carefully positioned optical isolator element. By precisely positioning this element in the first epoxy layer, the system eliminates harmful reflections before they can re-enter the laser cavity, thereby maintaining both high transmission rates and stable laser operation without the fluctuations and noise caused by feedback.
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 design effectively protects high performance semiconductor lasers from unwanted reflections and minimizes positional changes caused by temperature and humidity, resulting in a more stable and reliable optical isolator system.
Implementation Method 1
The glass base is adjoined with the optical element by applying a small amount of epoxy to one side of the optical element
Implementation Method 2
The operation of the isolator depends on the Faraday Effect (which in turn is produced by magneto-optic effects), which is used in a Faraday rotator. A magnetic field, B, applied to the Faraday rotator causes a rotation in the polarization of the light due to the Faraday Effect.
Implementation Method 3
The operation of the isolator depends on the Faraday Effect (which in turn is produced by magneto-optic effects), which is used in a Faraday rotator
Implementation Method 4
An input polarizer, a Faraday rotator, and an output polarizer, wherein the input polarizer is polarized vertically
Implementation Method 5
the output polarizer is polarized at 45 degrees. Light traveling in the forward direction becomes polarized vertically by the input polarizer. The Faraday rotator rotates the polarization of the light by 45 degrees, enabling light to be transmitted through the isolator. Alternatively, light traveling in the reverse direction becomes polarized at 45 degrees by the analyzer wherein the Faraday rotator rotates the polarization by 45 degrees. In other words, the light is polarized horizontally and since the polarizer is vertically aligned, the light will be extinguished.
Data Source
AI summary
In this invention, a free space isolator is utilized to protect high performance semiconductor lasers from back reflections by stabilizing optical elements of the isolator within a glass base inside a magnetic ring.