Chirped Light Source for DWDM Flexibility
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Solution Overview
Problem
Conventional directly modulated lasers (DMLs) have a narrow spectral tuning range, limiting their applicability in optical networks, particularly in dense wavelength division multiplexing (DWDM) systems, which requires multiple DMLs, increasing inventory costs and reducing flexibility in wavelength provisioning.
Innovation Solution
The system employs a chirped light source configuration using a CW laser with a modulator and attenuators to generate chirped light with a wide spectral range, emulating DML behavior, allowing for wider tunability and cost-effective implementation in DWDM applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional DML sources are used, then chirp characteristics are maintained, but spectral tuning range is limited to about 3 nm
Solution Approach 1:
The patent uses an external modulator to copy the chirp characteristics of a DML by modulating a CW laser with the same driving signal, thereby achieving wide spectral tuning range while maintaining the desired chirp properties without requiring multiple physical DML devices
Solution Approach 2:
The patent changes the operating parameters by using a CW laser instead of a DML and applying external modulation, allowing the spectral tuning range to be extended beyond the 3 nm limitation of conventional DMLs while preserving the chirp characteristics through controlled modulation parameters
2Adaptability or versatility
If multiple DMLs are used to cover wider spectral range, then spectral coverage is improved, but inventory cost and device complexity increase
Solution Approach 1:
The patent creates a universal solution where a single CW laser with external modulator can replace multiple DML devices, as the system can be tuned to cover the entire spectral range previously requiring multiple dedicated devices, thereby reducing inventory complexity
Solution Approach 2:
The patent merges the functions of multiple DMLs into a single system by combining a CW laser with an external modulator, achieving the spectral coverage of multiple devices while using fewer components and reducing overall system complexity
3Ease of operation
If DML temperature is varied for wavelength tuning, then wavelength adjustment is achieved, but spectral tuning range is limited to 3 nm
Solution Approach 1:
The patent substitutes the thermal tuning mechanism of DMLs with an electrical modulation approach using an external modulator, replacing the temperature-based wavelength adjustment with voltage-based frequency modulation, thereby achieving much wider spectral tuning range without the limitations of thermal tuning
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 approach provides a wider spectral range than conventional DMLs, reducing the need for multiple devices and lowering costs, while maintaining similar chirp characteristics, thus enhancing the flexibility and cost-effectiveness of DWDM systems.
Implementation Method 1
a modulator configured to receive the light, modulate the light using a first applied voltage and a second applied voltage, and provide a chirped light output
Data Source
AI summary
A system and method for providing chirped light for an optical network. The system includes a light source configured to provide a light. The system additionally includes a driving signal source configured to provide a first driving signal. The system also includes an amplifier configured to receive the first driving signal, amplify the first driving signal, and provide a second driving signal at a predetermined amplification level, the second driving signal being the amplified first signal. Additionally, the system includes a splitter configured to receive the second driving signal and split the second driving signal into a third driving signal and a fourth driving signal. The system also includes a first attenuator configured to receive the third driving signal, attenuate the third driving signal at a first attenuation level, and provide a fifth driving signal, the fifth driving signal being the third driving signal attenuated by the first attenuator.