Spectral response apodization of Bragg-like optical filters with a novel grating chirp design

Lupu, Anatole; Carenco, A.; Win, P.; Sik, H.; Boulet, Pascal; Carre, M.; Slempkès, S.

doi:10.1109/ofc.1999.766406

Cited by 7 publications

(6 citation statements)

References 8 publications

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“…Since such method is compatible with a binary etching process (using for simplicity a constant etch depth), it is especially attractive when Bragg-like structures are realized by surface corrugation techniques as it is often the case for photonic crystals or similar 1D or 2D periodic structures. Several dutycycle variations methods are described in literature [22][23][24][25][26]. The basic duty cycle (BDC) variation method introduced by Sakata [22] uses the coupling strength dependence on the grating duty cycle, i.e.…”

Section: Gratingsmentioning

confidence: 99%

“…4(b)], resulting in two cells of unequal length within the 2 period. The off-resonance modulation (ORM) method [24,25] is based on alternating whole gratings cells (ridge+groove) of modulated lengths Λ+∆ and Λ-∆ [ Fig. 4(c)].…”

Section: Gratingsmentioning

confidence: 99%

“…The solution to solve this issue is to consider a different type of modulation scheme, where, instead of the duty cycle, the local period of cells of the grating is changed. This is the essence of the ORM method proposed in [24,25], which can be considered as a first step toward deterministic aperiodic binary systems.…”

Section: Gratingsmentioning

confidence: 99%

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Tailoring Spectral Properties of Binary PT-Symmetric Gratings by Duty-Cycle Methods

Lupu¹,

Bénisty²,

Lavrinenko³

2016

IEEE J. Select. Topics Quantum Electron.

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We explore the frequency selective functionalities of a nonuniform PT-symmetric Bragg grating with modulated complex index profile. We start by assessing the possibility to achieve an efficient apodization of the PT-symmetric Bragg grating spectral response by using direct adaptations of the conventional apodization techniques. A particular emphasis is put on the binary type structures with different duty cycle variations. We subsequently propose a new efficient grating modulation technique allowing for largely improved reflection/transmission characteristics of the Bragg gratings. The overall intention of our approach is to adapt conventional Bragg gratings designs to improve a PT-symmetric case, fostering thus a new generation of active photonic devices.

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Section: Gratingsmentioning

confidence: 99%

Section: Gratingsmentioning

confidence: 99%

See 1 more Smart Citation

Tailoring Spectral Properties of Binary PT-Symmetric Gratings by Duty-Cycle Methods

Lupu¹,

Bénisty²,

Lavrinenko³

2016

IEEE J. Select. Topics Quantum Electron.

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“…1c). The off-resonance method (ORM) [7] is based on alternating gratings periods of lengths + and - (Fig. 1b).…”

Section: Introductionmentioning

confidence: 99%

Duty cycle variation methods for Bragg gratings: comparative study and optimal design

Lupu

2021

J. Opt. Soc. Am. B

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An analysis of spectral response apodization by duty cycle methods for gratingassisted optical filters is presented. The study is performed for the case of co-directional couplers, Bragg reflectors and mirrors. The modeling results show that the supersymmetric duty cycle (SDC) modulation method, initially considered for Parity-Time symmetric gratings [JSTQE 22(5), 35-41 (2016)], performs better than the other methods. An analytical approach to the transfer matrix of the modulated grating explains the better performance of the SDC method.

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“…For duty cycles smaller than 50%, that grating tooth is narrower than the grating groove. The second method proposed by Lupu et al 8 alternates one period, having a much smaller period length, with one having an equivalently larger grating period. At first glance both methods seem equally difficult if the production of small grating grooves (tens of nanometers) and small grating ridges is equally demanding.…”

Section: Introductionmentioning

confidence: 99%

Add–drop filter based on apodized surface-corrugated gratings

et al. 2003

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We report on the fabrication of a grating-based add-drop filter in SiON planar waveguide technology. We achieved apodization of the Bragg grating by concatenating subgratings with various duty cycles. We present the theoretical and experimental dependence of the coupling coefficient on the duty cycle, which leads to a minimum coupling coefficient of 30%. With a breeder genetic algorithm we were able to find optimal apodization profiles within this limited coupling coefficient range. The final device is compatible with a 100-GHz channel spacing and has a bandwidth utilization factor of 36%.

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Spectral response apodization of Bragg-like optical filters with a novel grating chirp design

Cited by 7 publications

References 8 publications

Tailoring Spectral Properties of Binary PT-Symmetric Gratings by Duty-Cycle Methods

Tailoring Spectral Properties of Binary PT-Symmetric Gratings by Duty-Cycle Methods

Duty cycle variation methods for Bragg gratings: comparative study and optimal design

Add–drop filter based on apodized surface-corrugated gratings

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