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  1. Article ; Online: Bendable large-mode-area fiber with a non-circular core: publisher's note.

    Ji, Junhua / Lin, Huaiqin / Sidharthan, Raghuraman / Ho, Daryl / Zhou, Yanyan / Nilsson, Johan / Yoo, Seongwoo

    Applied optics

    2018  Volume 57, Issue 29, Page(s) 8518

    Abstract: This publisher's note amends the spelling of the second author's name in Appl. Opt.57, 6388 (2018)APOPAI0003-693510.1364/AO.57.006388. ...

    Abstract This publisher's note amends the spelling of the second author's name in Appl. Opt.57, 6388 (2018)APOPAI0003-693510.1364/AO.57.006388.
    Language English
    Publishing date 2018-11-21
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.57.008518
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Bendable large-mode-area fiber with a non-circular core.

    Ji, Junhua / Lin, Huaiqing / Sidharthan, Raghuraman / Ho, Daryl / Zhou, Yanyan / Nilsson, Johan / Yoo, Seongwoo

    Applied optics

    2018  Volume 57, Issue 22, Page(s) 6388–6395

    Abstract: We investigate mode-area-scaling and bending performances of a Yb-doped large-mode-area fiber with an elongated non-circular core. Such fiber can be bent in the plane of its short axis to suppress bending effects, such as mode area reduction and mode ... ...

    Abstract We investigate mode-area-scaling and bending performances of a Yb-doped large-mode-area fiber with an elongated non-circular core. Such fiber can be bent in the plane of its short axis to suppress bending effects, such as mode area reduction and mode profile distortion. Meanwhile, the other orthogonal axis can be stretched for mode area scaling. Calculations show that for fibers with the same mode area, the higher the aspect ratio between the long axis and short axis, the less sensitive the fiber will be to bending effects. However, mode area scaling is limited by the increased beat length (BL) between the fundamental mode (FM) and the second-order mode, leading to mode degeneracy at higher aspect ratios. Within the 100 mm BL, the FM area is scalable to 3000  μm
    Language English
    Publishing date 2018-08-17
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4522
    ISSN (online) 1539-4522
    DOI 10.1364/AO.57.006388
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Ultra-short wavelength operation of thulium-doped fiber amplifiers and lasers.

    Chen, Shaoxiang / Jung, Yongmin / Alam, Shaif-Ul / Richardson, David J / Sidharthan, Raghuraman / Ho, Daryl / Yoo, Seongwoo / Daniel, Jae M O

    Optics express

    2019  Volume 27, Issue 25, Page(s) 36699–36707

    Abstract: We fabricate and characterize a germanium/thulium (Ge/Tm) co-doped silica fiber in order to enhance the gain at the short wavelength edge of the thulium emission band (i.e. 1620-1660 nm). The Ge/Tm doped fiber shows an intrinsic blue-shifted absorption/ ... ...

    Abstract We fabricate and characterize a germanium/thulium (Ge/Tm) co-doped silica fiber in order to enhance the gain at the short wavelength edge of the thulium emission band (i.e. 1620-1660 nm). The Ge/Tm doped fiber shows an intrinsic blue-shifted absorption/emission cross-section compared to aluminum/thulium (Al/Tm) co-doped fiber, which greatly improves the short wavelength amplification and has enabled us to further extend the shortest wavelength of emission towards 1600 nm. Using this glass fiber composition, we have demonstrated both a silica-based thulium doped fiber amplifier (TDFA) in the 1628-1655 nm waveband and a tunable thulium-doped fiber laser (TDFL) capable of accessing the telecom U-band wavelength region. These results represent by far the shortest amplifier/laser wavelengths reported to-date from TDFAs/TDFLs.
    Language English
    Publishing date 2019-12-23
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.27.036699
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Hollow core anti-resonant fiber with split cladding.

    Huang, Xiaosheng / Qi, Wenliang / Ho, Daryl / Yong, Ken-Tye / Luan, Feng / Yoo, Seongwoo

    Optics express

    2016  Volume 24, Issue 7, Page(s) 7670–7678

    Abstract: An improved design for hollow core anti-resonant fibers (HAFs) is presented. A split cladding structure is introduced to reduce the fabrication distortion within design tolerance. We use numerical simulations to compare the Kagome fibers (KFs) and the ... ...

    Abstract An improved design for hollow core anti-resonant fibers (HAFs) is presented. A split cladding structure is introduced to reduce the fabrication distortion within design tolerance. We use numerical simulations to compare the Kagome fibers (KFs) and the proposed split cladding fibers (SCFs) over two normalized transmission bands. It reveals that SCFs are able to maintain the desired round shape of silica cladding walls, hence improving the confinement loss (CL) compared to the KF and is comparable to that of the nested antiresonant nodeless fiber (NANF) with the same core size. In addition, the SCF allows stacking multiple layers of cladding rings to control the CL. The influences of the number of cladding layers and the cladding gap width on the CL of the SCFs have been studied. SCF with three cladding rings is fabricated by the stack-and-draw technique. A measured attenuation spectrum matches well with the calculation prediction. The measured near field mode patterns also prove the feasibility of our fiber design.
    Language English
    Publishing date 2016-04-04
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.24.007670
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Birefringent Bragg Grating in C-Shaped Optical Fiber as a Temperature-Insensitive Refractometer.

    Tan, Rex Xiao / Ho, Daryl / Tse, Chun Ho / Tan, Yung Chuen / Yoo, Seong Woo / Tjin, Swee Chuan / Ibsen, Morten

    Sensors (Basel, Switzerland)

    2018  Volume 18, Issue 10

    Abstract: We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode ...

    Abstract We demonstrate a simple-to-fabricate refractometer based on the inscription of fiber Bragg gratings in a special C-shaped optical fiber. The C-shaped fiber was drawn into shape using a quarter cladding removed preform of a commercial standard single-mode fiber by simple machining. The sensor did not suffer from cross-sensitivity of the refractive index with ambient temperature fluctuations, commonly occurring with many optical fiber refractometers. A refractive index sensitivity of 1300 pm per refractive index unit (RIU) was achieved without employing any additional sensitization techniques such as tapering or etching.
    Language English
    Publishing date 2018-09-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s18103285
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Step-index high-absorption Yb-doped large-mode-area fiber with Ge-doped raised cladding.

    Sidharthan, Raghuraman / Ji, Junhua / Lim, Kang Jie / Lim, Serene Huiting / Li, Huizi / Lua, Jian Wei / Zhou, Yanyan / Tse, Chun Ho / Ho, Daryl / Seng, Yue Men / Chua, Song Liang / Yoo, Seongwoo

    Optics letters

    2018  Volume 43, Issue 23, Page(s) 5897–5900

    Abstract: We report an all-solid large-mode-area (LMA) step-index fiber offering high absorption and low core numerical aperture (NA) by introducing a highly ytterbium-doped P:Al core and germanium-doped cladding. The fiber provides core absorption of ∼1200  dB/m ... ...

    Abstract We report an all-solid large-mode-area (LMA) step-index fiber offering high absorption and low core numerical aperture (NA) by introducing a highly ytterbium-doped P:Al core and germanium-doped cladding. The fiber provides core absorption of ∼1200  dB/m at 976 nm with a low 0.07 core NA, due to the raised Ge cladding. Furthermore, matched profiles of P and Al across the core are successfully obtained with high concentration of Yb
    Language English
    Publishing date 2018-12-20
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.005897
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article ; Online: 115  W fiber laser with an all solid-structure and a large-mode-area multicore fiber.

    Ji, Junhua / Raghuraman, Sidharthan / Huang, Xiaosheng / Zang, Jichao / Ho, Daryl / Zhou, Yanyan / Benudiz, Yehuda / Ami, Udi Ben / Ishaaya, Amiel A / Yoo, Seongwoo

    Optics letters

    2018  Volume 43, Issue 14, Page(s) 3369–3372

    Abstract: We investigate mode-area scaling by means of supermode operation in an all-solid multicore fiber. To obtain a large-mode area (LMA), we designed and fabricated an active double-clad multicore fiber, where each ytterbium-doped core is 19 μm in diameter ... ...

    Abstract We investigate mode-area scaling by means of supermode operation in an all-solid multicore fiber. To obtain a large-mode area (LMA), we designed and fabricated an active double-clad multicore fiber, where each ytterbium-doped core is 19 μm in diameter and has a numerical aperture of 0.067, comparable to the core of the largest available commercial LMA fibers. The six large cores are stacked tightly in a ring structure to enable phase locking of the core fields and supermode operation. The fiber laser performance was investigated in a linear laser cavity with an external Talbot resonator for mode selection. The highest output power achieved was 115 W with an overall 61% slope efficiency corresponding to the pump power. The measured M
    Language English
    Publishing date 2018-07-15
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.43.003369
    Database MEDical Literature Analysis and Retrieval System OnLINE

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