Interrogation of FBGs and FBGs Arrays Using Standard Telecom DFB Diode

Njegovec, Matej; Đonlagić, Denis

doi:10.1109/jlt.2016.2616725

Cited by 17 publications

(14 citation statements)

References 15 publications

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“…The method utilizes selective and very rapid temperature cycling of the DFB laser diode’s active region. A custom-designed high-speed programmable current generator drove the DFB diode based on the work in [ 8 , 9 ], where the authors modeled the current pulse waveform its duration and peak amplitude used for current control of the DFB diode to achieve linear OFS. Temperature recuperation of the DFB laser diode’s active region limits the pulse repetition rate in the proposed current pulsed generator [ 7 ].…”

Section: The Ofs Signal Generatormentioning

confidence: 99%

“…The optical frequency shift of the DFB laser diode is not proportional to temperature change in DFB laser diode’s active region [ 8 ]. The authors of [ 8 ] experimentally determined the current waveform to achieve linear OFS.…”

Section: The Ofs Signal Generatormentioning

confidence: 99%

, shown in Figure 3 , can be modeled as a linear function

and nonlinear part

, given by

where

represents OFS as a linear function, i.e., OFS rate

is constant function over time, and

represents the DFB laser diode’s characteristics.…”

Section: The Ofs Signal Generatormentioning

confidence: 99%

“…The DFB laser diode’s active region was heated using a current pulse with a high amplitude and short duration. In [ 7 , 8 , 9 ], the authors proposed a linear wavelength sweep method based on the waveform modeling of a DFB laser diode’s driving current pulse, which can enable a modulation frequency tuning rate equal to the current pulse repetition rate. The main advantage of the proposed signal generator is the generation of complex waveforms, such as optical linear-frequency chirp signal using a special design of pulse current waveform, which drives a laser diode and produces a nonlinear OFS.…”

Section: Introductionmentioning

confidence: 99%

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THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer

Pongrac

Đonlagić

Njegovec

et al. 2020

Sensors

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This paper presents a frequency-modulated optical signal generator in the THz band. The proposed method is based on a fast optical frequency sweep of a single narrowband laser diode used together with an optical fiber interferometer. The optical frequency sweep using a single laser diode is achieved by generating short current pulses with a high amplitude, which are driving the laser diode. Theoretical analysis showed that the modulation frequency could be changed by the optical path difference of the interferometer or optical frequency sweep rate of a laser diode. The efficiency of the optical signal generator with Michelson and Fabry–Perot interferometers is theoretically analyzed and experimentally evaluated for three different scenarios. Interferometers with different optical path differences and a fixed optical frequency sweep rate were used in the first scenario. Different optical frequency sweep rates and fixed optical path differences of the interferometers were used in the second scenario. This paper presents a method for optical chirp generation using a programmable current pulse waveform, which drives a laser diode to achieve nonlinear optical sweep with a fixed optical path difference of the interferometer. The experimental results showed that the proposed signals could be generated within a microwave (1–30 GHz) and THz band (0.1–0.3 THz).

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Section: The Ofs Signal Generatormentioning

confidence: 99%

Section: The Ofs Signal Generatormentioning

confidence: 99%

, shown in Figure 3 , can be modeled as a linear function

and nonlinear part

, given by

where

represents OFS as a linear function, i.e., OFS rate

is constant function over time, and

represents the DFB laser diode’s characteristics.…”

Section: The Ofs Signal Generatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer

Pongrac

Đonlagić

Njegovec

et al. 2020

Sensors

Self Cite

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show abstract

“…Often, FBG sensing systems are interrogated in a simple broadband scheme based in Wavelength Division Multiplexing (WDM), in such systems the requirement for the sensors to not overlap sets the limit in the number of sensors that can be deployed in a single sensing system. Time Domain Multiplexing (TDM) has been widely used as an alternative to this problem [3] but, in general, it compromises the acquisition rate of the system and demands high speed switching circuits, recent approaches use weak FBGs to achieve large-scale sensing systems. Weak FBG sensors should be interrogated either with TDM [4] or frequency shifted interferometry [5] approaches exhibit crosstalk limitations due to the shadowing effect between near-identical FBGs [6].…”

Section: Introductionmentioning

confidence: 99%

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

Triana

Pastor

Varón

2017

J. Lightwave Technol.

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Abstract-We propose and demonstrate a sensing system with fiber Bragg grating (FBG) sensors designed as Discrete Prolate Spheroidal Sequences (DPSS). In this way, we can encode all of the sensing devices in the network making sure that each sensor is completely distinguishable from each other even under overlapping conditions. Since these devices are complex structures involving unique magnitude and phase response, the demodulation method should be able to recover the associated magnitude and phase response in order to identify each device in the sensing network. To do so, we use a Single Side Band (SSB) modulated optical source sweeping over the operational wavelength range of the sensors, the reflected signal from the sensors is sent to a Vector Network Analyzer (VNA) in which it is obtained the magnitude and phase ratio of the network in the microwave domain. Experimental demonstration has been carried out including the manufacturing of DPSS structures. Feasibility of the interrogation technique for devices involving magnitude and phase distinction has been validated, not only to identify encoded sensors in a measurement network but also to allow overlapping between them, which allow to increase the number of sensors allocated in the sensing network.

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High-Speed Interrogation of Low-Finesse Fabry–Perot Sensors Using a Telecom DFB Laser Diode

Javernik

Đonlagić

2017

J. Lightwave Technol.

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Interrogation of FBGs and FBGs Arrays Using Standard Telecom DFB Diode

Cited by 17 publications

References 15 publications

THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer

THz Signal Generator Using a Single DFB Laser Diode and the Unbalanced Optical Fiber Interferometer

Code Division Multiplexing Applied to FBG Sensing Networks: FBG Sensors Designed as Discrete Prolate Spheroidal Sequences (DPSS-FBG Sensors)

High-Speed Interrogation of Low-Finesse Fabry–Perot Sensors Using a Telecom DFB Laser Diode

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