Fiber Collimator Calibration Using Mirror Feedback Power Maximization
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Solution Overview
Problem
Existing methods for calibrating collimating lens systems in optical communication networks are inefficient and costly, often requiring expensive interferometers or wavefront sensors.
Innovation Solution
A method and system for calibrating a collimating lens system using a perfect flat mirror, an optical transmitter, a power meter, and an optical circulator, where the beam is reflected back through the lens system, and the position of the optical fiber is adjusted to maximize power reception, allowing for precise collimation without the need for expensive calibration tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive interferometers or wavefront sensors are used for calibration, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces expensive, complex calibration equipment (interferometers, wavefront sensors) with simple, inexpensive components: a flat mirror, optical circulator, power meter, and adjustable optical fiber. The power meter serves as a simple detection tool that provides sufficient measurement capability without the complexity of sophisticated optical instruments.
Solution Approach 2:
The calibration system uses the optical communication device's own components (optical fiber, collimating lens, optical circulator, power meter) to perform self-calibration. The device calibrates itself without requiring external specialized equipment, making the process simpler and more integrated.
2Device complexity
If simple calibration equipment is used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The calibration process uses feedback from the power meter to iteratively adjust the optical fiber position. The system measures the returned optical power at different fiber positions and uses this feedback to determine the optimal collimation position, achieving high precision through iterative optimization rather than complex measurement equipment.
Solution Approach 2:
The calibration system dynamically adjusts the optical fiber position during calibration and then secures it at the optimal position. The system transitions from a dynamic adjustment phase to a static operational phase, allowing precise collimation to be achieved through controlled movement and positioning rather than static complex equipment.
3Ease of operation
If manual fiber positioning is used, then ease of operation is improved, but productivity deteriorates
Solution Approach 1:
The calibration process uses periodic scanning of the optical fiber position along the optical axis, measuring power at multiple discrete positions. This periodic sampling approach systematically explores the optimal position range while maintaining ease of operation through automated sequential measurement and adjustment.
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 method enables precise calibration of collimating lens systems, achieving high power reception and producing very precise collimators, while reducing costs by eliminating the need for expensive calibration equipment.
Implementation Method 1
an optical circulator having a first port configured to receive a second beam from the optical transmitter, a second port configured to output the second beam and receive the first beam from the collimating lens system, and a third port configured to output the first beam to the power meter
Implementation Method 2
reflecting the beam off a perfect flat mirror positioned at an output of the collimating lens and back towards the collimating lens
Implementation Method 3
transmitting, using an optical transmitter, a beam out of an optical fiber and through a collimating lens of the collimating lens system
Data Source
AI summary
A method of calibrating a collimating lens system includes transmitting, using an optical transmitter, a beam out of an optical fiber and through a collimating lens of the collimating lens system. The beam is reflected off a perfect flat mirror positioned at an output of the collimating lens and back towards the collimating lens, and received, via the collimating lens, at a power meter connected to the optical fiber. The method also includes adjusting a position of a tip of the optical fiber proximal to the collimating lens while tracking a power reading using the power meter, selecting a calibration position of the optical fiber corresponding to a highest power reading, and securing the optical fiber relative to the collimating lens using the calibration position.