Mach–Zehnder interferometer type optical waveguide coupler with wavelength-flattened coupling ratio

Jinguji, K.; Takato, N.; Sugita, A.; Kawachi, M.

doi:10.1049/el:19900855

Cited by 119 publications

(38 citation statements)

References 2 publications

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“…, where ∆β = β 2 − β 1 − κ 13 . In general, the mode profile of a single local normal mode will evolve as it propagates along a longitudinally-varying waveguide structure.…”

Section: Normal Modes Of Three Coupled Waveguidesmentioning

confidence: 99%

“…Various approaches have been suggested to mitigate chromaticity of 2 by 2 couplers and achieve a wavelength flattened response. These approaches include (i) asymmetric directional couplers, where the two constituent waveguides differ in width but are uniform along the direction of propagation [12], (ii) Mach-Zehnder type interferometers that are wavelength-insensitive [13], and (iii) tapered velocity couplers, where the waveguide widths are varied along the propagation direction [14]. The operation of the devices described by (i) and (ii) above depend on the interference between modes, while the tapered velocity mode coupler (iii) is meant to operate adiabatically, where there is little coupling between the local normal modes.…”

Section: Introductionmentioning

confidence: 99%

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Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

2010

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Integrated optic beam combiners offer many advantages over conventional bulk optic implementations for astronomical imaging. To date, integrated optic beam combiners have only been demonstrated at operating wavelengths below 4 µm. Operation in mid-infrared wavelength region, however, is highly desirable. In this paper, a theoretical design technique based on three coupled waveguides is developed to achieve fully achromatic, broadband, polarizationinsensitive, lossless beam combining. This design may make it possible to achieve the very deep broadband nulls needed for exoplanet searching.

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“…, where ∆β = β 2 − β 1 − κ 13 . In general, the mode profile of a single local normal mode will evolve as it propagates along a longitudinally-varying waveguide structure.…”

Section: Normal Modes Of Three Coupled Waveguidesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

2010

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“…Figures 12(a) and (b), respectively, show the logical configuration and the layout of a single-chip integrated with a 40-ch V-AWG and a 40-ch AWG-demultiplexer with a spacing of 100 GHz (~0.8 nm). An array of 40 variable optical attenuators (VOAs), wavelength insensitive couplers (WINCs) 40) as power taps, following micromirrors, and an AWG-multiplexer were designed in tandem on a single chip. Furthermore, an AWG demultiplexer was also designed in parallel.…”

Section: Jcs-japanmentioning

confidence: 99%

Silica-based waveguide devices for photonic networks

Abe

2008

J. Ceram. Soc. Japan

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Silica-based waveguide devices as represented by planar lightwave circuits (PLCs) are key devices for constructing photonic networks with huge data transmission capacity and flexibility. As a result of recent progress on optical communication networks, dynamically controlled silica-based optical devices have become both significant and practical. The thermo-optic (TO) effect is employed to control optical signals. The devices that have been developed include TO switches, variable optical attenuators (VOAs), and devices in which they are integrated. The silica-based waveguide phase shifters that employ the TO effect in these devices are compact, highly reliable, and suitable for large-scale integration. This paper reviews the large scale matrix switches including an 8 × 8 TO switch and a 32 × 32 TO switch. And a 40-ch VOA integrated AWG multiplexer with tap couplers, micromirrors, and monitor photodiodes is also demonstrated.

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“…For this purpose, we developed a compact and colorless PLC-DLI, adopting MZI based wavelength-insensitive couplers [7] with narrow coupling waveguides (N-WINC) and optimized circuit design suitable for integrated receivers. Fig.…”

Section: Introductionmentioning

confidence: 99%

Compact and Colorless PLC-Type 1-Bit Delay Line Interferometer for DQPSK Demodulator

Kawashima

Nara

2012

IEEE Photon. Technol. Lett.

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A compact and colorless planar lightwave circuit (PLC) type 1-bit delay line interferometer for a differential quadrature phase-shift keying (DQPSK) demodulator is demonstrated by adopting wavelength insensitive couplers with narrow coupling waveguides and novel circuit arrangement suitable for integrated DQPSK receivers. The fabricated interferometer realizes a small chip size and practical properties in both entire C-and L-bands.Index Terms-Delay line interferometer, DQPSK demodulator, optical waveguide, planar lightwave circuit.

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Mach–Zehnder interferometer type optical waveguide coupler with wavelength-flattened coupling ratio

Cited by 119 publications

References 2 publications

Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

Midinfrared broadband achromatic astronomical beam combiner for nulling interferometry

Silica-based waveguide devices for photonic networks

Compact and Colorless PLC-Type 1-Bit Delay Line Interferometer for DQPSK Demodulator

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