Broadband Laser Linearizer With Adjustable CSO and CTB Tilt
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Solution Overview
Problem
Existing broadband communication equipment linearizers face challenges in generating flexible and adjustable second and third order distortions over a wide frequency range while maintaining minimal impact on the main signal path gain, as they often require complex modifications and are limited in independently controlling distortion amplitude and phase.
Innovation Solution
A broadband linearizer system that includes a splitter, a distortion generator with amplifiers and non-linear elements, and a combiner, capable of generating frequency-independent and frequency-dependent second and third order distortions through adjustable bias currents, using Schottkey diodes and PIN diodes to control impedance and distortion coefficients, allowing for adjustable amplitude and phase settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate second and third order distortion generation paths are used, then distortion generation flexibility is improved, but device complexity increases
Solution Approach 1:
The patent combines second and third order distortion generation into a single path using one amplifier and shared non-linear elements, eliminating the need for separate distortion generation paths while maintaining the ability to generate both distortion types through adjustable bias currents
Solution Approach 2:
The single amplifier and non-linear element configuration serves multiple functions by generating both second and third order distortions simultaneously through adjustable bias currents, making the distortion generator multi-functional rather than requiring dedicated paths for each distortion type
2Ease of manufacture
If in-line distortion generation with feedback path is used, then implementation simplicity is improved, but control freedom over distortion amplitude and phase deteriorates
Solution Approach 1:
The distortion generation function is extracted from the main signal path and placed in a separate bypass path, allowing independent control of distortion parameters without affecting the main signal gain and enabling adjustment of distortion amplitude and phase independently of the linear signal path
3Volume of moving object
If multiple distortion generating components are combined at single emitter node, then device compactness is improved, but gain control stability deteriorates
Solution Approach 1:
The distortion generating components are segmented into separate locations along the emitter path rather than being combined at a single node, with Schottkey diodes at one location and PIN diodes at another, allowing independent control of distortion generation and gain stabilization without mutual 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
The system achieves compact distortion generation with adjustable amplitude and phase, minimizing impact on main signal path gain and enabling flexible distortion control, suitable for applications requiring variable distortion profiles over a wide frequency range.
Implementation Method 1
the one or more amplifiers and one or more non-linear elements are operable to generate second and third order distortions through adjustable bias currents
Implementation Method 2
using Schottkey diodes and PIN diodes to control impedance and distortion coefficients
Data Source
AI summary
Systems and methods can provide an improved broadband linearizer that includes a distortion generator with a bypass path for generating both composite triple beat (CTB) and composite second order (CSO) distortions suitable for linearizing a laser. The linearized laser can be suitable for injection into a communications network such as, for example, a hybrid fiber coaxial (HFC) network, among others.