Two-electrode DFB laser filter used as a wide tunable narrow-band FM receiver: tuning analysis, characteristics and experimental FSK-WDM system

Chawki, M.J.; Auffret, R.; Coquil, E. Le; Pottier, P.; Berthou, L.; Paciullo, H.; Bihan, Jean Le

doi:10.1109/50.166781

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The peak expressions of 2f signal derived above have assumed that the line-width is zero, which cannot describe how DFB laser line-width affects the 2f signal peak. Here, we assume that the DFB line-width is v, [17] and then the output intensity of line-center v 0 is…”

Section: -2mentioning

confidence: 99%

Self-calibration wavelength modulation spectroscopy for acetylene detection based on tunable diode laser absorption spectroscopy

Huang

et al. 2016

Chinese Phys. B

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The expressions of the second harmonic (2f) signal are derived on the basis of absorption spectral and lock-in theories. A parametric study indicates that the phase shift between the intensity and wavelength modulation makes a great contribution to the 2f signal. A self-calibration wavelength modulation spectroscopy (WMS) method based on tunable diode laser absorption spectroscopy (TDLAS) is applied, combining the advantages of ambient pressure, temperature suppression, and phase-shift influences elimination. Species concentration is retrieved simultaneously from selected 2f signal pairs of measured and reference WMS-2f spectra. The absorption line of acetylene (C 2 H 2 ) at 1530.36 nm near-infrared is selected to detect C 2 H 2 concentrations in the range of 0-400 ppmv. System sensitivity, detection precision and limit are markedly improved, demonstrating that the self-calibration method has better detecting performance than the conventional WMS.

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Section: -2mentioning

confidence: 99%

Self-calibration wavelength modulation spectroscopy for acetylene detection based on tunable diode laser absorption spectroscopy

Huang

et al. 2016

Chinese Phys. B

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“…expression in(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) is similar to the definition of reflection and transmission coefficients obtained from Frensnel's equations in case of single interface. For the present problem, where there is only light coming out from the right-hand side of the 1-D PhC, E' r become 0.…”

mentioning

confidence: 76%

“…Bragg reflector or Bragg mirror is a series of periodic dielectric media consisting of at least two types of materials of different refractive index. Perhaps, it is most commonly used in semiconductor lasers, such as distributed Bragg reflector (DBR) lasers [16][17] and distributed feedback (DFB) lasers [18][19][20]. Similar structures are also employed in fiber optics where they are called fiber Bragg gratings [21].…”

Section: Bragg Reflectorsmentioning

confidence: 99%

“…On the effect of reaction moment, the normalized local x-distance at maximum y-deflection is less than 1 as can be expected from upward bending of the cross-beam. However, the value is almost equal to one and thus it plays a very small part on further reducing the output y-displacement in (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22). It is noteworthy that increment of the value of X'…”

Section: Physical Interpretation and Some Sample Calculationsmentioning

confidence: 99%

“…The only parameter left to study is the number of stack of the 1-D PhC. Upon substituting(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15) into(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19) and specifying an integer value for N, the reflection and transmission coefficients in(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21) are attained.…”

mentioning

confidence: 99%

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Investigation into mechanically-tunable one-dimensional photonic crystal

Thubthimthong¹

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Recent advances in photonic crystals subject focus mostly on optical properties of rigid structures of two-dimensional or three-dimensional photonic crystals (2-D or 3-D PhCs). While many interesting applications, such as waveguide bends, resonant cavity, add-drop filters, etc., are benefited from the PhCs, tuning optical properties of the PhCs is still a challenging issue. All tuning methods yield small alteration of photonic band gaps (PBGs). An exception from those is the mechanical tuning that promises the largest tuning of the PBG. However, the mechanical tunings for 2-D PhCs and 3-D PhCs have only been conceptualized. Surprisingly, mechanical tunability of one-dimensional photonic crystals (1-D PhCs) has not been investigated much although 1-D PhCs also possess interesting PBG effects. Moreover, simplicity of the 1-D PhC structure encourages easier fabrication and characterization. Therefore, an attempt to demonstrate an application of tunable 1-D PhCs is addressed in this work. A mechanically-tunable PBG polarization splitter was proposed. The device utilized the PBG effect at inclined incidence to separate transverse-electric (TE) mode from transverse-magnetic (TM) mode. Silicon and polydimethylsiloxane (PDMS) were chosen for constructing the tunable 1-D PhC for the device. An improved plane wave expansion method and a transfer matrix method were employed to calculate PBGs of the PhC. The matrix method was further employed to design a finite tunable 1-D PhC at Brewster's angle. Mechanical tuning of the PBG by varying the thickness of PDMS was studied using the method. Transmitted power and polarization degree were calculated. It was found that periodicity of three was appropriate for constructing the tunable 1-D PhC. The designed silicon thickness was 6 μm at operating frequency of 3.5 THz, whereas the range of PDMS thickness was 6-12 μm so that transmittance of TE mode could be varied from 0 to unity. Finitedifference time-domain simulation yielded consistent results. To achieve the mechanical tuning, a thermal microactuator was designed and simulated. Microfabrication processes were developed for the tunable 1-D PhC device. The processes aimed at fabricating together both the 1-D PhC and the for giving the opportunity to work on the topic and for many precious discussions and significant initial supports. The supervisions, the advices, and the encouragements from them were important to the student, and they are much and ever appreciated. Many thanks go to the technicians of Micromachines Lab 1, i.e.

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