研究目的
To develop a programmable spectral filter in the C-band based on a digital micromirror device (DMD) that achieves a minimum bandwidth of 12.5 GHz, matching the ITU G.694.1 standard, with capabilities for flexible channel control and high power handling.
研究成果
The DMD-based programmable spectral filter achieves a minimum bandwidth of 12.5 GHz in the C-band with flexible tuning of center wavelength, bandwidth, and power attenuation. It handles high input power up to 50 dBm, making it suitable for high-power applications like optical networks and EDFA equalizers. Future work will focus on optimizing bandwidth and reducing crosstalk by improving optical components.
研究不足
The filter has an insertion loss of about 10 dB, and the channel crosstalk for 12.5 GHz and 25 GHz ITU grids needs improvement due to non-ideal flat-topped spectral profiles. The system experiences optical aberrations and insertion loss fluctuations of about 1 dB due to conical diffraction and aberrations.
1：Experimental Design and Method Selection:
The system employs a DMD combined with a high-line-density transmission grating in a 2-f optical system to achieve programmable spectral filtering. The design includes a fiber-coupling microlens array, polarization converter, lenses, grating, and DMD to demultiplex and filter light.
2：Sample Selection and Data Sources:
An amplified spontaneous emission (ASE) light source in the 1530–1560 nm range is used as input signals for testing.
3：List of Experimental Equipment and Materials:
Includes a fiber-coupling microlens array with 127 μm pitch, polarization converter, collimating lens (f1=300 mm), transmission grating (1201.2 line/mm), cemented cylindrical lens (f2=140 mm), DMD (1024x768 mirrors, pitch 13.68 μm, ±12° tilt), and an optical spectrum analyzer (AQ6370C-YOKOGAWA).
4：2 line/mm), cemented cylindrical lens (f2=140 mm), DMD (1024x768 mirrors, pitch 68 μm, ±12° tilt), and an optical spectrum analyzer (AQ6370C-YOKOGAWA). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Input light is collimated, polarized, dispersed by the grating, focused onto the DMD, and diffracted back to the output port. Binary holograms are uploaded to the DMD to control micromirrors for wavelength selection and filtering. Measurements of insertion loss, bandwidth, and tuning resolution are performed.
5：Data Analysis Methods:
Data is analyzed using the optical spectrum analyzer to measure spectral characteristics, with calculations based on diffraction models and intensity measurements.
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Optical Spectrum Analyzer
AQ6370C
YOKOGAWA
Measuring insertion loss, 3 dB-bandwidth, and tuning resolution of the optical filter.
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Digital Micromirror Device
1024x768 mirrors, pitch 13.68 μm
Texas Instruments
Spatial light modulation for programmable spectral filtering by tilting micromirrors to select and steer wavebands.
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Transmission Grating
1201.2 line/mm
Angularly dispersing the collimated broadband beam in the x-axis direction for wavelength separation.
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Collimating Lens
f1=300 mm
Converting input divergent Gaussian beam into a parallel beam for collimation.
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Cemented Cylindrical Lens
f2=140 mm
Focusing the dispersed light into an elliptical spot on the DMD to achieve minimum bandwidth.
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Fiber-Coupling Microlens Array
127 μm-pitch
Coupling input and output fibers with the optical system, providing ports for light transmission.
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Polarization Converter
Modulating the polarization state of the input beam to match the S-polarization dependency of the grating.
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