Optical Interleaver Using FIR and IIR Filters
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Solution Overview
Problem
Current optical filter designs for WDM systems face challenges in minimizing chromatic dispersion across the passband while achieving a wide, nearly flat top passband with high extinction ratios, as existing FIR and IIR filters have limitations in achieving these desired characteristics simultaneously.
Innovation Solution
A periodic optical filter arrangement that combines finite-impulse response (FIR) and infinite-impulse response (IIR) filters, where the FIR and IIR filters are designed to have opposite and approximately equal chromatic dispersion, minimizing overall chromatic dispersion and maintaining desired passband characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If FIR filters are used to minimize chromatic dispersion, then chromatic dispersion is reduced, but the passband does not provide the desired wide, nearly flat top characteristics
Solution Approach 1:
The patent combines FIR and IIR filters in a hybrid configuration where the FIR filter minimizes chromatic dispersion and the IIR filter provides the desired wide, nearly flat top passband characteristics. This merging of two different filter types allows simultaneous achievement of both objectives that cannot be met by either filter type alone.
2Manufacturing precision
If IIR filters are used to provide wide, nearly flat top passbands, then passband characteristics are improved, but chromatic dispersion cannot be minimized
Solution Approach 1:
The patent combines FIR and IIR filters in a hybrid configuration where the IIR filter provides the desired wide, nearly flat top passband characteristics and the FIR filter minimizes chromatic dispersion. This merging of two different filter types allows simultaneous achievement of both objectives that cannot be met by either filter type alone.
3Device complexity
If a single filter type is used, then device complexity is reduced, but it is impossible to achieve both wide flat top passband and minimum chromatic dispersion simultaneously
Solution Approach 1:
The patent combines FIR and IIR filters in a hybrid configuration where each filter type contributes its strengths: the FIR filter minimizes chromatic dispersion and the IIR filter provides the desired wide, nearly flat top passband characteristics. This merging of two different filter types allows simultaneous achievement of both objectives that cannot be met by either filter type alone.
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 combination of FIR and IIR filters in the periodic optical filter design effectively minimizes chromatic dispersion, achieving a wide, flat top passband with high extinction ratios, thereby enhancing the performance of WDM systems by reducing signal distortion and increasing network capacity without the need for additional optical fibers.
Implementation Method 1
Optical interleaver based on mach-zehnder interferometers and ring resonators
Implementation Method 2
Optical interleaver based on mach-zehnder interferometers and ring resonators
Data Source
Figure 1A~1B
Figure 2A~2D
Figure 3A~3B
AI summary
A periodic optical filter for interleaving a plurality of optical signals to provide a multiplexed signal for transmission over an optical fiber is disclosed. The periodic optical filter includes a first optical filter constructed to receive at least two optical signals through an input port to provide at least one filtered optical signal. The periodic optical filter also includes a second optical filter, in communication with the first optical filter, constructed to receive the filtered optical signal from the first optical filter through an intermediate port to provide a multiplexed signal for transmission through an output port. At least one of the optical filters includes an infinite-impulse response filter and at least one of the optical filters includes a finite-impulse response filter. Methods of fabrication and methods of use including the periodic optical filter are disclosed.