Wavelength to time interval demodulation employing a tunable micro-ring

Vargas, Germán; Panepucci, Roberto R.

doi:10.1109/imoc.2011.6169317

Cited by 2 publications

(7 citation statements)

References 15 publications

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“…This feature is useful in our interrogation system in a way that a number of sensors are individually interrogated and their information can be extracted independently from each other [72].…”

Section: Demodulation System Characteristics / Constraints / Parametersmentioning

confidence: 99%

“…A FBG sensor is employed to demonstrate the system capabilities to detect Bragg wavelength shifts due to strain or temperature changes in the sensor. Adapted from [72].…”

Section: System Conceptmentioning

confidence: 99%

“…Then, an expression is derived for the center wavelength of a sensor using the time interval wavelength demodulation [72].…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

“…However, the design can be optimized in terms of more nm/mW if a circular micro-heater shape is used. By taking into account this linear relationship, the resonance wavelength is [72]:…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

“…By noticing that a triangular signal is used, the expression for resonance change in a MRR within one period becomes [72]:…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

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Silicon Photonic Device for Wavelength Sensing and Monitoring

López¹,

German²

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However, other fields of research such as optical sensor processing can benefit from silicon photonics technology, specially in sensors where the physical measurement is wavelength encoded.In this research work, we present a design and application of a thermally tuned silicon photonic device as an optical sensor interrogator.The main device is a micro-ring resonator filter of 10 µm of diameter. A photonic design toolkit was developed based on open source software from the research community. With those tools it was possible to estimate the resonance and spectral characteristics of the filter. From the obtained design parameters, a 7.8 x 3.8 mm optical chip was fabricated using standard micro-photonics techniques. In order to tune a ring resonance, Nichrome micro-heaters were fabricated on top of the device. Some fabricated devices were systematically characterized and their tuning response were determined. From measurements, vi a ring resonator with a free-spectral-range of 18.4 nm and with a bandwidth of 0.14 nm was obtained. Using just 5 mA it was possible to tune the device resonance up to 3 nm.In order to apply our device as a sensor interrogator in this research, a model of wavelength estimation using time interval between peaks measurement technique was developed and simulations were carried out to assess its performance. To test the technique, an experiment using a Fiber Bragg grating optical sensor was set, and estimations of the wavelength shift of this sensor due to axial strains yield an error within 22 pm compared to measurements from spectrum analyzer.Results from this study implies that signals from FBG sensors can be processed with good accuracy using a micro-ring device with the advantage of ts compact size, scalability and versatility. Additionally, the system also has additional applications such as processing optical wavelength shifts from integrated photonic sensors and to be able to track resonances from laser sources.

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Section: Demodulation System Characteristics / Constraints / Parametersmentioning

confidence: 99%

“…A FBG sensor is employed to demonstrate the system capabilities to detect Bragg wavelength shifts due to strain or temperature changes in the sensor. Adapted from [72].…”

Section: System Conceptmentioning

confidence: 99%

“…Then, an expression is derived for the center wavelength of a sensor using the time interval wavelength demodulation [72].…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

“…However, the design can be optimized in terms of more nm/mW if a circular micro-heater shape is used. By taking into account this linear relationship, the resonance wavelength is [72]:…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

“…By noticing that a triangular signal is used, the expression for resonance change in a MRR within one period becomes [72]:…”

Section: Time Interval Wavelength Demodulationmentioning

confidence: 99%

See 3 more Smart Citations