Wavelength-selective directional coupler made of nonidentical single-mode fibers

Zengerle, R.; Leminger, O.

doi:10.1109/jlt.1986.1074807

Cited by 28 publications

(6 citation statements)

References 8 publications

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“…All-fiber optical filters have benefit of being easily integrated into a fiber-optic link exhibit low losses and lower back reflections. Several all-fiber band pass filters have been proposed including fused taper coupler [4], dissimilar core fiber coupler [5], dual-core [6], and triple-fiber couplers [7] which are based on the mode coupling phenomenon. Exchange Bragg reflection between two strongly coupled dissimilar waveguides lead to tunable and narrow pass band fiber Bragg grating (FBG) filter has also been proposed [8].…”

Section: Introductionmentioning

confidence: 99%

All fiber optical band-pass filter using macro-bending approach

Muhd-Yassin

Emami

Anuar

et al. 2012

2012 IEEE 3rd International Conference on Photonics

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A new method for optical bandpass filters using macro bending approach is proposed. The proposed optical bandpass filter leverages on bending loss of higher order modes for shorter wavelengths. For longer wavelengths, the filter banks on fiber bending loss as the fundamental mode 'tail' is lost in the cladding. The combination of wavelength dependent loss at longer and shorter wavelength gives rise to the optical bandpass filter characteristics. We report both simulation and experimental results, which demonstrates agreement in the spectral response.

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Section: Introductionmentioning

confidence: 99%

All fiber optical band-pass filter using macro-bending approach

Muhd-Yassin

Emami

Anuar

et al. 2012

2012 IEEE 3rd International Conference on Photonics

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“…Several methods have been proposed for multiplexing and demultiplexing optical signals in different wavelengths [1][2][3][4][5][6][7][8][9][10][11]. Among them the all-fiber spectral filter is especially promising because of its low insertion and transmission loss.…”

Section: Introductionmentioning

confidence: 99%

“…Among them the all-fiber spectral filter is especially promising because of its low insertion and transmission loss. Wavelength selective coupler can be made of two identical or dissimilar fibers [3][4][5][6][7][8][9][10][11]. The bandwidth of two identical fibers coupler is generally very large, thus it requires long coupling length to form a narrow-band filter.…”

Section: Introductionmentioning

confidence: 99%

“…Narrow-band spectral filter with short coupling length can be achieved by the dissimilar fiber coupler due to its large difference in the slope of dispersion curves. Most of the dissimilar couplers consist of two single-clad fibers with different core radii and core index distributions [9,10]. Recently, a narrow-band spectral filter made of W-index and step-index fibers offered a spectral width on the order of several nanometers, considerably narrower than that provided by a filter made of two single-clad fibers [11].…”

Section: Introductionmentioning

confidence: 99%

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Narrow-band an Low Sidelobes Spectral Filter with Weighted Coupling

Chao¹,

Wu²

1995

Journal of Optical Communications

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The paper discusses the narrow-band and low sidelobes spectral filter achievable with directional coupler constructed with a W-index and a step-index fibers. By properly weighting the coupling strength along the device, the sidelobe levels can be reduced significantly. With a Gaussian function weighting, -39.6 dB transfer response sidelobes have been obtained, more than 30 dB reduction over the uniform coupling case. Besides, the implict relations between the coupling length and the required bending radius can be found.

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“…3 (2) refer to fibers 1 and 2, respectively. It is noted that the characteristics of LP,,(l) and LP,,(,) modes intersect at k 1 .…”

Section: Numerical Resultsmentioning

confidence: 99%

All-fiber spectral filter based on LP/sub 01/-LP/sub 11/ mode coupling

Jagannathan

Safaai‐Jazi²

Proceedings IEEE SOUTHEASTCON '97. 'Engineering the New Century'

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Spectral filters made of singlemode identical or dissinailar core pardel fibers provide 3-dB spectral widths on the order of 1 to 10 nm. A spectral filter made of singlemode and dualmode fibers and operating based on coupling of power between LP,, and LP,, modes is proposed for applications as narrowband demultiplexers and as wideband mode converters with spectral widths on the order of fraction of 1 n m to few 10 n m , respectively. With appropriate choice of parameters, filters can be designed such that the LP, mode of the singlemode f i h r is phase matched with the LP,, mode of the dual-mode fiber at a desired wavelength, thus significant exchange of power between these two modes can occur. The coupled-mode theory of parallel didectric wavegnides is used to analyze the proposed filter. Design data and transmission characteristics for maximum power coupling at 1.33 pm and 1.55 pm are presented.

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Wavelength-selective directional coupler made of nonidentical single-mode fibers

Cited by 28 publications

References 8 publications

All fiber optical band-pass filter using macro-bending approach

All fiber optical band-pass filter using macro-bending approach

Narrow-band an Low Sidelobes Spectral Filter with Weighted Coupling

All-fiber spectral filter based on LP/sub 01/-LP/sub 11/ mode coupling

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