Design and Fabrication of DWDM Multiplexer Using Optical Fiber Biconical Tapered Couplers

광섬유 용융인장 방법에 의한 DWDM용 광다중화기의 제작

  • Chang, Jin-Hyeon (Dept. of Information & Electrical Transmission, Korea Information & Communication Polytechnic College) ;
  • Kim, Myoung-Saeng (Dept. of Information & Electrical Transmission, Korea Information & Communication Polytechnic College) ;
  • Kang, Duk-Keun (Dept. of Information & Electrical Transmission, Korea Information & Communication Polytechnic College)
  • 장진현 (한국정보통신기능대학 정보전송설비학과) ;
  • 김명생 (한국정보통신기능대학 정보전송설비학과) ;
  • 강덕근 (한국정보통신기능대학 정보전송설비학과)
  • Published : 2004.09.01

Abstract

In this paper, 8-channel multiplexer with 100GHz channel spacing is fabricated. The 8-channel multiplexer is fabricated by connecting three cascaded Mach Zehnder Interferometer (MZI) of optical fiber type, and each interferometer has the wavelength interval of 100GHz, 200GHz and 400GHz, respectively. furthermore, to acquire uniform insertion loss, it is fabricated by using Wavelength Flatten Coupler (WFC) in which the variation of insertion loss is low. Especially, the variation of wavelength interval in the output is explicitly simulated as a function of optical path difference, and the wavelength coupling process along with cascaded connection is discussed. $CO_2$ laser to adjust precisely the wavelength. In summary, The prototype composed by eight cascaded MZI has an insertion loss of 2.1dB, the bandwidth of 0.8nm at 5.5dB point, and channel crosstalk of 25dB Furthermore, the loss dependent on polarization is measured as 0.06dB.