Adiabatic couplers: design rules and optimization

Ramadan, Tarek A.; Scarmozzino, R.; Osgood, Richard M.

doi:10.1109/50.661021

Cited by 76 publications

(53 citation statements)

References 20 publications

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“…(15), L gives a measure of the error involved in making a complete power transfer coupler of length L. since the input power in guides is redistributed through the almost unchanged quasi-normal mode, this kind of coupler is called as "adiabatic directional couplers". In addition, we can express the "mode crosstalk" L in Fourier transform which we are more familiar [7]. …”

Section: Adiabatic Directional Couplersmentioning

confidence: 99%

“…The analytic solution "cross-beta" coupler with linear variation of propagation constants and constant coupling coefficient was derived [5,6]. A Fourier integral interpolation of presented was coupled-local-mode theory of the mode-conversion loss in adiabatically tapered waveguide [7]. The filter response of corrugated optical waveguides has demonstrated that significant reduction in undesirable sidebars can be achieved by smoothly weighting the corrugation depth [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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Improved design of optical directional full couplers based on new function modified by hamming function

Chen

2006

2006 International Conference on Mechatronics and Automation

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Improved design of optical directional full couplers (ODFCs) based on new function modified by hamming function is investigated. The modification-hamming function weighting (M-HFW) of new function is described. The validity of approximation theory of optical directional full couplers becomes questionable when the coupling length is not enough long so the beam propagation method (BMP) is used. We propose a new design and numerically show that some optical properties of the optimized one are better than the optimized coupler with hamming function weighting (HFW). The objective of the work includes in the new design of optical directional full couplers can obtain respectively low noise, large frequency and short couplers. When the crosstalk is demanded to be smaller than -40 dB at testing wavelength 1.57 m , the coupler length for hamming function weighting for new weighting is 5.8 mm and the one for modification-hamming function weighting is only 4mm. When the length of coupler is 12 mm and the crosstalk is smaller than -40 dB, the corresponding wavelength ranges of convention and modified cases are in the 1.38 ~1.67 m and 1.3 ~1.7 m , respectively. It is surely that the proposed modification-hamming function weighting is more effective than convention weighting for optical directional full couplers.

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Section: Adiabatic Directional Couplersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved design of optical directional full couplers based on new function modified by hamming function

Chen

2006

2006 International Conference on Mechatronics and Automation

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“…The effective refractive index of the SiNx waveguide is varied from 1.455 to 1.450, and that of the SiON waveguide from 1.454 to 1.452, between 1.3 and 1.55 m. The adiabatic-mode transition via the difference of the effective refractive index enables the excited optical power to propagate the direction chosen by wavelength [5]. According to the beam propagation (BPM) simulation result [6], Figure 2 shows insertion loss is 1.45 and 0.7 dB at 1.31 and 1.55 m, respectively.…”

Section: Configuration Of Plc Platformmentioning

confidence: 99%

“…Figure 5 presents a continuously repeated scan of the laser spectra under the pump power of 2.25 W, which indicates the good stability of the output laser. In addition, the light polarization has minor influence on both the output power and the laser spectra.It is necessary to note that no ytterbium-lasing occurs (around 1060.0 nm), even under the maximum pump power, mainly due to the high-energy-conversion efficiency from the ytterbium ions to the erbium ions in the EYDF and the pump power being not strong enough [5]. Thus, higher pump power can be launched in order to enhance the output power of the EYDFL.…”

mentioning

confidence: 98%

Hybrid packaging for a 1.25‐Gb/s bidirectional transceiver using a filter‐integrated planar lightwave circuit platform

Moon

Han

Choi

et al. 2005

Micro & Optical Tech Letters

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of the laser is about 0.4 nm, and the 3-dB bandwidth nearly maintains the constant when the pump power increases. The sidemode-suppression ratio of the laser increases with the increasing pump power and reaches about 45 dB at higher pump power. When the pump power is higher than 1 W, the laser spectrum becomes very stable, without any power jitter or wavelength shifting. Figure 5 presents a continuously repeated scan of the laser spectra under the pump power of 2.25 W, which indicates the good stability of the output laser. In addition, the light polarization has minor influence on both the output power and the laser spectra.It is necessary to note that no ytterbium-lasing occurs (around 1060.0 nm), even under the maximum pump power, mainly due to the high-energy-conversion efficiency from the ytterbium ions to the erbium ions in the EYDF and the pump power being not strong enough [5]. Thus, higher pump power can be launched in order to enhance the output power of the EYDFL. CONCLUSIONIn this paper, an all-fiber EYDFL has been presented and the influence of the BCM reflectivity on the output characteristics of the EYDFL has been analyzed. With a 4% reflecting-fiber facet replacing the FLM with the PC as the output port, the EYDFL realizes highly stable laser output with fine shape. Output power as high as 1.027 W at 1567.0 nm was obtained under the pump power of 3.16 W. The slope efficiency with respect to the launched pump power reaches 34.5%. ACKNOWLEDGMENT INTRODUCTIONWith the spread of fiber-to-the-home (FTTH) in optical communications, the low-cost optical transceiver is regarded as one of the most important devices for access networks. Promising packaging technologies such as the planar lightwave circuit (PLC) platform and passive alignment have already been introduced [1]. In the case of the bidirectional transceiver, one of most popular packaging methods [2][3][4] is the use of the thin-film filter (TFF) on the PLC platform with flip-chip bonding for passive alignment of active devices. However, the use of an additional component and the complexity of packaging when inserting the TFF after sawing on the PLC, as well as the sensitivity of filter to the angle of incident light, have been regarded as practical problems for realizing low-cost and mass production. In this paper, we demonstrate a hybrid bidirectional device based on passive alignment and the filter-integrated PLC platform. Especially, as the structure of the proposed PLC platform is designed to use V-groove and flip-chip bonding for passively making optical interconnection, we expect the proposed hybrid transceiver will be very suitable for low-cost packaging. Also, we discuss the configuration of the PLC platform, the assembly process, and the optical performance of the fabricated transceiver. CONFIGURATION OF PLC PLATFORMThe configuration of the 3.5 ϫ 15 mm PLC platform, including the flip-chip-bonding, integrated-filter, and V-groove sections, is shown in Figure 1. First, active devices are bonded in the flip-chip bonding section, where a 3...

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“…It consists of SiN x and SiON waveguides in the silica layer. The effective refractive index of the SiN x waveguide is varied from 1.455 to 1.450, and that of the SiON waveguide from 1.454 to 1.452 between 1.3 and 1.55 m. It is operated via adiabatic-mode transition [6] and the structure of both waveguides is designed to set the crossing point of the filter in the center of a predetermined wavelength range. The SiN x and SiON waveguides are overlapped in the entrance of filter so that they guide the excited optical power to propagate between waveguides without any abrupt mode mismatch.…”

Section: Design and Packaging Processmentioning

confidence: 99%

Packaging for a FP-LD hybrid transceiver using filter-integrated PLC platform with PD insertion trench

Moon

Han

Choi

et al. 2006

Microw. Opt. Technol. Lett.

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Adiabatic couplers: design rules and optimization

Cited by 76 publications

References 20 publications

Improved design of optical directional full couplers based on new function modified by hamming function

Improved design of optical directional full couplers based on new function modified by hamming function

Hybrid packaging for a 1.25‐Gb/s bidirectional transceiver using a filter‐integrated planar lightwave circuit platform

Packaging for a FP-LD hybrid transceiver using filter-integrated PLC platform with PD insertion trench

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