WO2009155536A2 - Fused fiber optic coupler arrangement and method for use thereof - Google Patents
Fused fiber optic coupler arrangement and method for use thereof Download PDFInfo
- Publication number
- WO2009155536A2 WO2009155536A2 PCT/US2009/047988 US2009047988W WO2009155536A2 WO 2009155536 A2 WO2009155536 A2 WO 2009155536A2 US 2009047988 W US2009047988 W US 2009047988W WO 2009155536 A2 WO2009155536 A2 WO 2009155536A2
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- Prior art keywords
- electro
- magnetic radiation
- clad fiber
- cladding
- arrangement
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
- G02B6/2835—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals formed or shaped by thermal treatment, e.g. couplers
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03622—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only
- G02B6/03633—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 2 layers only arranged - -
Definitions
- the present disclosure relates to exemplary embodiments of a fiber optical article of manufacture, and more particularly to fused (e.g., mode-selective) fiber optic coupler arrangements and methods for use thereof.
- a conventional dual cladding fiber has an internal structure typically consisting of a core 100, an inner cladding 102, an outer cladding 104, and a protection jacket 106. Both the core 100 and inner cladding 102 are structured to guide an optical wave along a longitudinal axis 108. A wave guiding mechanism is provided either by total internal reflection through an appropriate refractive-index profile (see Fig. 1) or Bragg band gap properties.
- the core 100 can typically be designed to guide only a single spatial mode, so called HEI l mode.
- the inner cladding 102 can guide hundreds to millions of multiple spatial modes.
- the DCF have been developed originally for optical fiber amplifiers and lasers.
- Signal light propagating in a rare-earth-ion-doped core of the DCF can be amplified while interacting with pump waves guided in the cladding.
- DCF can be applied in biomedical imaging.
- the probe light is delivered through the single-mode core to a biological sample, whereas the signal light transmitted through or reflected from the sample can be collected by the inner cladding as well as the core of DCF.
- This exemplary arrangement can be advantageous over more conventional method based on a single-mode fiber or multi-mode fiber in terms of spatial resolution, light collection efficiency, etc.
- a first multi-clad fiber arrangement can be provided that comprises a first core and at least one first cladding which is structured to propagate at least one first electro-magnetic radiation therethrough.
- a second multi-clad fiber arrangement can also be provided that comprises a second core and at least one second cladding which is structured to propagate at least one second electro-magnetic radiation therethrough.
- at least one portion can be provided in which the first and second claddings are fused to one another.
- the first and second cores can be separated from one another within the portion(s).
- the separation between the first and second cores within the portion(s) can be greater than a wavelength of at least one of the first and/or second electro-magnetic radiation.
- a core mode coupling ratio between the first and second cores within the portion(s) can be less than about 10%, 1%, 0.1%, etc.
- a cladding mode coupling ratio between the first and second claddings within the portion(s) can be between about 10% and 90%. between about 40% and 60%, approximately 50%, etc.
- the first and second multi-clad fiber arrangements can be double-clad fiber arrangements. Optical properties of the first and second multi-clad fiber arrangements can be substantially identical. Further, at least one single mode fiber arrangement can also be provided which can be coupled to the first and/or second multi-clad fiber arrangement. The single mode fiber arrangement(s) can include at least one third cladding which can be structured to prevent a propagation of an electro-magnetic radiation therethrough. [0010] According to still another exemplary embodiment of the present invention, system and method can be provided. For example, at least one first electro-magnetic radiation can be provided using a first arrangement.
- first electro-magnetic radiation(s) can be received from the first arrangement and outputted to a sample using at least one of at least two multi-clad fiber arrangements of a second arrangement.
- Each of the multi-clad fiber arrangements can comprise a core and at least one cladding which can be structured to propagate the first electro-magnetic radiation(s) therethrough.
- the second arrangement further can comprise at least one portion in which at least one of the claddings of at least two of the multi-clad fiber arrangements are fused to one another.
- the multi-clad fiber arrangements receive at least one second electro-magnetic radiation from the sample which can be associated with the first electro-magnetic radiation(s), and propagate the second electro-magnetic radiation(s) via the core and the cladding thereof.
- a third arrangement can be provided which is configured to detect the at least one third electro-magnetic radiation.
- the second electro-magnetic radiation can be a fluorescence radiation or a scattered light.
- FIG. 1 is a perspective cross-sectional view of a structure of a conventional double clad fiber which includes a refractive index profile thereof;
- FIG. 2 is a diagram of a conventional system which can implement free space coupling configurations;
- Fig. 3 is a side view of an exemplary embodiment of a fabrication of a fused-type
- Figs. 4A-4C are side views the exemplary DCF coupler implementing exemplary operating principles according to the present disclosure; [0018] Figs. 5A and 5B are side views further exemplary embodiments of the fused-type
- DCF coupler according to the present disclosure, and of an exemplary fabrication and/or implementation thereof;
- Fig. 6 is a diagram of one exemplary embodiment of an imaging system utilized an exemplary embodiment of the DCF coupler in accordance with the present disclosure
- Fig. 7 is a diagram of another exemplary embodiment of the imaging system utilized a further exemplary embodiment of the DCF coupler in accordance with the present disclosure.
- An exemplary embodiment of a method of fabricating a DCF coupler can be similar to a conventional method for fabricating fused single-mode fiber couplers or multimode fiber couplers.
- This exemplary method intermediate jacket-stripped sections of two identical fibers contact one another and are twisted together, which can be tapered longitudinally by applying heat.
- the details of this exemplary fiber fusion method are known in the art.
- two DCF fibers 110 and 112 which can have identical and/or similar designs, can be tapered and fused in a middle portion 120 by a heat source 130.
- the heat source 130 can include, but not limited to, hydrogen-oxygen flame, graphite mini-furnace, and CO2 laser.
- a probe beam can be used to measure a coupling ratio in situ to generate control feedback to optimize optical characteristics of a fabricated device.
- Figs. 4A-4C illustrate side views of the exemplary embodiment of the arrangement according to the present disclosure shown in Fig. 4 performing exemplary operating principle according to the present disclosure.
- a signal light 200 (e.g., or any electro-magnetic radiation) propagated in the core 100 of a first fiber 110 can experience small or minimal, e.g., preferably less than 10%, coupling to the other fiber 112 after propagating through a coupler waist section/portion 120.
- the signal light (e.g., which can be any electro-magnetic radiation) can remain as the core mode 202 of the first fiber.
- light or other electro-magnetic radiation guided in the inner cladding, or the cladding modes 210 may experience strong coupling, and the output can be provided into the two or more fibers 110, 112, e.g., with nearly equal intensity.
- This exemplary property can be achieved by controlling a degree of fusion of the coupler waist section/portion 120.
- mode coupling between cladding modes of the fibers 110, 112 can start, increase gradually, and can reach to a strong coupling regime, before mode coupling between the core modes is even started.
- the coupling between the core modes may typically begin when the V-value of the core mode is reduced to less than 1 by tapering.
- the exemplary arrangement can act as a conventional multimode fiber coupler.
- the splitting ratio of an individual cladding mode can vary from about 0 to 100%, depending on the spatial order, wavelength, and polarization, likely yielding an overall power splitting ratio close to about 50/50 between the two outputs 212, 214.
- appropriate fiber types can preferably be selected.
- FIGs. 5A and 5B illustrate side views of further exemplary embodiments of the arrangements according to the present disclosure and exemplary performance of exemplary procedures using such arrangements, along with a fabrication and/or an implementation of the exemplary fused-type DCF coupler(s).
- one port of the above-referenced exemplary DCF coupler can be connected to a single mode fiber 300 at an input side 310 thereof, e.g., by fusion splicing.
- Fig. 5 A illustrates side views of further exemplary embodiments of the arrangements according to the present disclosure and exemplary performance of exemplary procedures using such arrangements, along with a fabrication and/or an implementation of the exemplary fused-type DCF coupler(s).
- one port of the above-referenced exemplary DCF coupler can be connected to a single mode fiber 300 at an input side 310 thereof, e.g., by fusion splicing.
- Fig. 5 A illustrates of further exemplary embodiments of the arrangements according to the present disclosure and exemplary performance of exemplary procedures using
- one port of the above-referenced exemplary DCF coupler can be connected to another single mode fiber 305 at an output side thereof, e.g., also by fusion splicing.
- the single mode fiber(s) 300, 305 can act as a spatial mode filter can facilitate only the core mode (i.e., light and/or electro-magnetic radiation only being transmitted through the core 100) to be launched to the coupler (shown in Fig. 5A) and to be received from the coupler (shown in Fig. 5B).
- core mode i.e., light and/or electro-magnetic radiation only being transmitted through the core 100
- Fig. 6 shows a diagram of one exemplary embodiment of an optical imaging system based on the above-described exemplary DCF coupler in accordance with the present disclosure.
- the single-mode fiber 300 can be connected to a light source or another electro-magnetic radiation source 400.
- the light source 400 can include, but not limited to, a monochromatic laser, a mode-locked laser, a Super-Luminescent Diode (SLD), an LED and/or a tunable source.
- An output of the light source 400 can be delivered to an optical probe 410 through the core 100 of the fiber 110 of the exemplary DCF.
- the probe light/radiation can illuminate a sample 420, which can be a biological sample.
- the light/radiation reemitted from the sample 420 via reflection, scattering, and/or fluorescence can be received by the optical probe 410.
- the optical probe 410 can comprises at least one or more of lens, such as, e.g., objective lens or GRIN lens.
- the optical energy coupled to the core 100 of the DCF can then be transmitted back toward the light source 400.
- Approximately a half of the optical energy initially coupled in the claddings 102, 104 of the first fiber 110 of the exemplary the DCF and returning from the sample 420 can be coupled to the second fiber 112 in the cladding 111, 116 thereof, and can be detected by a photo-receiver 430.
- the photo-receiver 430 can include, but not limited to, a photodiode, a CCD array and/or a CMOS array.
- the exemplary optical system shown in Fig. 6 can be realized for two-photon fluorescence imaging as described in M. T. Myaing et al., "Enhanced two-photon biosensing with double-clad photonic crystal fibers," Opt. Lett. 28, 1224-1226 (2003).
- the light source 400 can be a pulsed laser emitting infrared light.
- the optical probe 410 can utilize a high NA objective lens focusing the core mode to the sample 420.
- the fluorescent light generated within the sample 420 and received by the cladding 116 of the DCF through the objective lens can then be measured at the photo- receiver 430 through a dielectric filter filtering the pump wave and transmitting, e.g., only the fluorescence signal light.
- the optical probe 410 can include a beam scanning actuator to scan the probe beam transversely across the sample 420.
- the exemplary embodiment of the imaging system shown in Fig. 6 can also be configured for spectrally-encoded endoscopy as described in D. Yelin et al., "Double clad fiber for endoscopy," Opt. Lett. 29, 2408-2410 (2004).
- the light source 400 can include a broadband SLD, and the probe 410 can utilize a diffraction grating and lens to focus different wavelengths to different spatial points in the sample 420.
- the reflected light captured in the cladding 111, 116 of the DCF can be detected by, e.g., a CCD array.
- the exemplary imaging system architecture of another exemplary embodiment of the present disclosure can be extended for an interferometric imaging by adding a single- mode fiber coupler 500, a reference mirror 520, and a photodetector 540, as illustrated in Fig. 7.
- the reference mirror 520 can be scanned axially.
- the photodetector 540 can include a spectrometer which can have a diffraction grating and a detector array for spectral-domain detection.
- a wavelength- tunable light source can be used as a light source 430 for optical frequency domain imaging.
- Various exemplary techniques for interferometer-based optical imaging are known in the art.
- FIG. 6 Other exemplary embodiments of the imaging system with configurations modified from Fig. 6 can include reflectance confocal imaging, fluorescence detection, fluorescence confocal imaging, multi photon fluorescence microscopy, coherent Raman microscopy, and second- or third-harmonic generation microscopy.
- the exemplary DCF coupler can also be used in cladding-pumped optical amplifiers and lasers for combining or splitting the signal and pump waves.
Abstract
Description
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP09767845A EP2288948A4 (en) | 2008-06-20 | 2009-06-19 | Fused fiber optic coupler arrangement and method for use thereof |
JP2011514852A JP5795531B2 (en) | 2008-06-20 | 2009-06-19 | Fused fiber optic coupler structure and method of using the same |
US12/999,231 US8861910B2 (en) | 2008-06-20 | 2009-06-19 | Fused fiber optic coupler arrangement and method for use thereof |
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US7433908P | 2008-06-20 | 2008-06-20 | |
US61/074,339 | 2008-06-20 |
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WO2009155536A2 true WO2009155536A2 (en) | 2009-12-23 |
WO2009155536A3 WO2009155536A3 (en) | 2010-03-25 |
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PCT/US2009/047988 WO2009155536A2 (en) | 2008-06-20 | 2009-06-19 | Fused fiber optic coupler arrangement and method for use thereof |
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US (1) | US8861910B2 (en) |
EP (1) | EP2288948A4 (en) |
JP (1) | JP5795531B2 (en) |
WO (1) | WO2009155536A2 (en) |
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Also Published As
Publication number | Publication date |
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US20110226940A1 (en) | 2011-09-22 |
EP2288948A2 (en) | 2011-03-02 |
EP2288948A4 (en) | 2011-12-28 |
JP5795531B2 (en) | 2015-10-14 |
WO2009155536A3 (en) | 2010-03-25 |
US8861910B2 (en) | 2014-10-14 |
JP2011525255A (en) | 2011-09-15 |
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