• Title, Summary, Keyword: supercontinuum generation

Search Result 12, Processing Time 0.033 seconds

Design of nonlinear photonic crystal fibers with ultra-flattened zero dispersion for supercontinuum generation

  • Kumar, Pranaw;Fiaboe, Kokou Firmin;Roy, Jibendu Sekhar
    • ETRI Journal
    • /
    • v.42 no.2
    • /
    • pp.282-291
    • /
    • 2020
  • The study reports on the design and performance of two air-filled and two partial ethanol-filled photonic crystal fiber (PCF) structures with a tetra core for supercontinuum generation. The PCFs are nonlinear with ultra-flattened zero dispersion. Holes with smaller areas are used to create a tetra-core PCF structure. Ethanol is filled in the holes of smaller area while the larger holes of cladding region are airfilled. Optical properties including dispersion, effective mode area, confinement loss, normalized frequency, and nonlinear coefficient of the designed PCF structures are investigated via full vector finite difference time domain (FDTD) method. A PCF structure with lead silicate as wafer exhibits significantly better results than a PCF structure with silica as wafer. However, both structures report dispersion at a telecommunication wavelength corresponding to 1.55 ㎛. Furthermore, the PCF structure with lead silicate as wafer exhibits a very high nonlinear coefficient corresponding to 1375 W-1 km-1 at the same wavelength. This scheme can be used for optical communication systems and in optical devices by exploiting the principle of nonlinearity.

Half mJ Supercontinuum Generation in a Telecommunication Multimode Fiber by a Q-switched Tm, Ho:YVO4 Laser

  • Zhou, Renlai;Ren, Jiancun;Lou, Shuli;Ju, Youlun;Wang, Yuezhu
    • Journal of the Optical Society of Korea
    • /
    • v.19 no.1
    • /
    • pp.7-12
    • /
    • 2015
  • Up to ${\sim}520{\mu}J$ broadband mid-infrared (IR) supercontinuum (SC) generation in telecommunication multimode fiber (MMF) directly pumped by a $2.054{\mu}m$ nanosecond Q-switched Tm, $Ho:YVO_4$ laser is demonstrated. An average output power of 3.64 W is obtained in the band of ~1900 to ~2600 nm, and the corresponding optic-to-optic conversion efficiency is 67% by considering the coupling efficiency. The spectrum has extremely high flatness with negligible intensity variation (<2%) in the wavelength interval of ~2070 to ~2475 nm. The SC long-wavelength edge is limited by the silicon glass material loss, and by optimizing the MMF length, the SC spectrum could extend out to ${\sim}2.6{\mu}m$. The output SC pulse shapes are measured at different output powers, and no splits are found. The SC laser beam is nearly diffraction limited with an $M^2=1.15$ in $2.1{\mu}m$ measured by the traveling knife-edge method, and the laser beam spot is monitored by an infrared vidicon camera.

Characterization of Supercontinuum Generation as a function of Pump Wavelength and Intensity in Photonic Crystal Fiber (광자 결정 광섬유에서 펌프광원의 파장과 입력파워에 따른 초 광대역 광원 발생의 특성)

  • Kim, Jong-Doo;Yee, Ki-Ju;Jeon, Min-Yong;Ahn, Seong-Joon;Choi, Yong-Gyu
    • Korean Journal of Optics and Photonics
    • /
    • v.16 no.6
    • /
    • pp.490-493
    • /
    • 2005
  • We have experimentally studied supercontinuum generation in a photonic crystal fiber as a function of pump wavelength and intensity with 100 fs pulsewidth. A supercontinuum over 750 nm spectral width with amplitude variation less than 10 dB has been achieved. It was generated by coupling femtosecond pulses from a mode-locked Ti:Sapphire laser into a 2 m long photonic crystal fiber. Adjusting the parameters of the pump source, it was also possible to control different spectral features of the supercontinuum radiation.

Supercontinuum Generation with Femtosecond Pulses and Photonic Crystal Fibers (펨토초 펄스와 광결정 광섬유를 이용한 초 연속스펙트럼의 발생)

  • Choi, Hyoung-Gye;Kim, So-An;Kee, Chul-Sik;Sung, Jae-Hee;Yu, Tae-Jun;Ko, Do-Kyeong;Lee, Jong-Min
    • Korean Journal of Optics and Photonics
    • /
    • v.18 no.5
    • /
    • pp.345-350
    • /
    • 2007
  • The characteristics of the supercontinuum generated in photonic crystal fibers were investigated by using the generalized nonlinear $Schr\"{o}dinger$ equation and the split-step Fourier method. Based on the simulated results, we generated the supercontinuum spectrum with the flatness of ${\pm}4dB$ in the wavelength range of 650 to 900 nm by employing a 200-fs pulse of Ti:sapphire laser and a commercial photonic crystal fiber.

Absorption Spectra of Standard Gases for Wavelength Reference in C-band using a Supercontinuum Source Based on a Mode-locked Cr4+:YAG Laser (모드 잠금 Cr4+:YAG 레이저로부터 발생된 초 광대역 광원을 이용한 광통신 파장 영역의 표준 가스의 흡수스펙트럼)

  • Lee, Jong-Min;Jeon, Min-Yong;Ryu, Han-Young;Suh, Ho-Suhng
    • Korean Journal of Optics and Photonics
    • /
    • v.19 no.1
    • /
    • pp.54-59
    • /
    • 2008
  • We report on the measurements of absorption spectra from acetylene ($^{12}C_2H_2$) and hydrogen cyanide ($H^{13}C^{14}N$) for wavelength reference in the C-band (conventional band) region using a supercontinuum optical source generated from a mode-locked $Cr^{4+}$:YAG laser. The center wavelength of the mode-locked $Cr^{4+}$:YAG laser was 1510 nm and the pulse duration was 75 fs at 100 MHz repetition rate. The supercontinuum source achieved a flatness of ${\pm}5dB$ over a wavelength range of more than 400 nm, using a 20 m long photonic crystal fiber. The measured absorption spectra from acetylene ($^{12}C_2H_2$) and hydrogen cyanide ($H^{13}C^{14}N$) had more than 50 lines and were analyzed for wavelength standardization.