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Serrodyne Frequency Shift Spectrometer and Serrodyne Frequency Shifting
Published Patent Application Number: WO 2024/130243
Problem
Previously used methods often required Acousto-optic modulators, which are relatively expensive and have narrow bandwidths. They can also be difficult to fabricate in integrated photonics platforms.
Invention
Serrodyne modulation (i.e., using a sawtooth waveform to produce a linear phase chirp) is performed using an electro-optic phase modulator to provide the needed frequency shift.
Potential Commercial Applications
This provides a pathway for comb generation and operation in a chip-scale package. This approach also reduces cost and complexity by reducing the number of components and fabrication steps.
Competitive Advantage
This lowers the associated cost by eliminating the need for a series of fiber optic splitters and individual modulators. Given the strong common-mode nature of the comb generation and the reduction of overall fiber length and number of components, the associated noise is expected to be lower.