Polarization Maintaining Laser Device for Optical Communication
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Solution Overview
Problem
Conventional optical space communication systems face challenges in maintaining pointing stability and accuracy due to atmospheric disturbances, and lack the ability to monitor the outgoing direction of the laser beam without increasing system complexity.
Innovation Solution
The system employs a laser device with a first laser unit for a transmission laser beam and a second laser unit for a reference laser beam, both linearly polarized and transmitted through polarization maintaining optical fibers, allowing for the use of a polarization combiner to maintain polarization differences and enable tracking of the outgoing beam direction using a lower power reference beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional single laser unit is used for transmission, then the system structure is simple, but the outgoing beam direction cannot be monitored
Solution Approach 1:
The single laser unit is segmented into two functional laser units: a first laser unit for generating the transmission laser beam and a second laser unit for generating the reference laser beam. This segmentation allows the transmission beam to be used for communication while the reference beam is used for direction monitoring, thereby achieving beam direction monitoring capability without significantly increasing overall system complexity.
Solution Approach 2:
A polarization combiner is introduced as an intermediary component to combine the transmission laser beam and reference laser beam into a single optical path. The combiner uses polarization differences to separate and combine beams, enabling the reference beam to follow the same optical path as the transmission beam for accurate direction monitoring while maintaining system simplicity.
2Measurement precision
If a reference laser beam is added for tracking, then the outgoing direction can be monitored, but the system complexity increases
Solution Approach 1:
The reference laser beam is given a distinct local quality through orthogonal polarization relative to the transmission laser beam. This polarization distinction allows the reference beam to be easily identified and tracked separately from the transmission beam using polarization-sensitive detectors, enabling precise pointing stability monitoring without requiring complex monitoring systems.
Solution Approach 2:
The system uses polarization state as a distinguishing parameter between the transmission beam and reference beam. By setting the reference beam's polarization direction perpendicular to the transmission beam's polarization direction, the system enables simple and accurate beam direction monitoring through polarization-based detection methods, reducing the complexity of monitoring and control systems.
3Power
If high optical power is used for transmission, then the transmission distance is extended, but the tracking system may be damaged
Solution Approach 1:
The reference laser beam is extracted from the transmission system as a separate low-power beam with orthogonal polarization. This extracted reference beam is specifically designed with low optical power suitable for tracking system safety, while the main transmission beam maintains high optical power for extended transmission distance. The polarization combiner allows both beams to coexist in the same optical path without interference.
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 allows for effective tracking of the outgoing beam direction while preventing damage to tracking systems and maintaining high power transmission, enhancing the stability and accuracy of optical space communication systems.
Implementation Method 1
the first optical fiber and the second optical fiber are formed of polarization maintaining optical fibers, and the laser device further includes a polarization combiner connected to a third polarization maintaining optical fiber for conveying the transmission laser beam and the reference laser beam to an optical output of the laser device, while maintaining a mutual difference between the polarization directions of the transmission laser beam and the reference laser beam
Data Source
AI summary
A laser device for optical communication comprises a first laser unit connected to a first optical fiber for supplying a transmission laser beam thereto. wherein the laser device is configured for providing a reference laser beam in addition to the transmission laser beam. For providing the reference laser beam the laser device further includes a second laser unit connected to a second optical fiber for supplying the reference laser beam to the second optical fiber. The first laser unit is configured for providing the transmission laser beam as a linear polarized beam that is polarized in a first polarization direction, and the second laser unit is configured for providing the reference laser beam as a linear polarized beam that is polarized in a second polarization direction. The first optical fiber and the second optical fiber are formed of polarization maintaining optical fibers, and the laser device further includes a polarization combiner connected to a third polarization maintaining optical fiber for conveying the transmission laser beam and the reference laser beam to an optical output of the laser device.