Monolithic Interferometric Optical Transmitter Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current optical communication systems face challenges in increasing network capacity while minimizing capital investment, particularly in efficiently integrating optical components for tunable transmitters that support various modulation formats.
Innovation Solution
The development of a monolithically integrated interferometric optical transmitter with a dual output optical source and an optical signal combiner, which allows for the generation of optical signals with different modulation formats, such as QAM, DPSK, BPSK, and QPSK, while providing chirp control and low phase noise, by using a dual front mirror and dual output waveguide laser configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If chip-scale integration of optical components is implemented, then capital investment is reduced and mass production is enabled, but device complexity increases due to the need for precise integration of multiple optical components
Solution Approach 1:
The patent merges the optical source and optical modulator into a single integrated device structure. The optical source includes a first waveguide and a second waveguide that are integrated with the modulator, eliminating the need for separate discrete components and reducing overall system complexity while enabling mass production.
Solution Approach 2:
The integrated optical transmitter is designed to support multiple modulation formats (OOK, QAM, PSK, QPSK) within a single device. The optical modulator can operate in different modes depending on the driving signals applied, making the device universally applicable to various communication standards and reducing the need for multiple specialized devices.
2Productivity
If multiple modulation formats are supported, then spectral efficiency is improved and data throughput capacity increases, but device complexity increases due to the need for multiple optical paths and modulators
Solution Approach 1:
The patent employs dynamic control of the optical modulator through multiple electrodes (first and second electrodes) that can be independently driven. This allows the same physical structure to dynamically switch between different modulation formats (OOK, QAM, PSK, QPSK) by changing the drive signals, enabling high data throughput without requiring separate optical paths for each modulation type.
Solution Approach 2:
The optical modulator is divided into multiple sections with separate electrodes (first electrode and second electrode) that can be independently controlled. This segmentation allows different portions of the optical path to be modulated differently, enabling complex modulation formats like QAM and PSK while maintaining a relatively simple overall structure.
3Device complexity
If an optical splitter is integrated with the optical source, then the optical modulator can be properly integrated, but insertion loss increases and optical power is reduced
Solution Approach 1:
The optical splitter functionality is merged directly into the optical source structure. The first waveguide and second waveguide are integrated such that they naturally split and recombine the optical path without requiring a separate discrete splitter component, thereby minimizing insertion loss while maintaining proper modulator integration.
Solution Approach 2:
The patent introduces waveguide structures as intermediaries between the optical source and modulator. These waveguides serve as mediators that guide and combine the optical paths, eliminating the need for separate splitters and reducing optical power loss through more efficient light coupling and transmission.
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 solution enables the creation of compact, high-power optical transmitters capable of transmitting signals over long distances with low spectral line width and phase noise, supporting advanced modulation formats and wide wavelength tuning, thus enhancing optical network capacity efficiently.
Implementation Method 1
an active region comprising an active material configured to generate light when an electric field is applied to the active region
Implementation Method 2
an optical signal combiner configured to interferometrically combine the optical signals output from the two optical vector modulators
Implementation Method 3
two optical vector modulators configured to modulate the optical signals propagating through the first and second optical paths, respectively
Data Source
AI summary
A monolithic integrated optical transmitter comprising (a) an optical source including two output optical paths and (b) a modulator section that includes an interferometric optical signal combiner is described. Each of the two output optical paths of the optical source includes a reflector. The optical source is configured to output a first light beam through the first optical path and a second light beam through the second optical path. The optical transmitter is capable of generating advanced modulation format signals based on amplitude and phase modulation.