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Temperature Compensation of 8 Channel DWDM Multiplexer Using All Optical fiber Mach-Zehnder Structure  

Chang, Jin-Hyeon (한국정보통신기능대학)
Jung, Jin-Ho (호서대학교 전기정보통신공학부)
Kim, Young-Kwon (후레정보통신대학교)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.8A, 2005 , pp. 697-704 More about this Journal
Abstract
In this paper, Passive Temperature Compensation Technology is apply to 8-channel Optical multiplexer with 1000Hz channel spacing. 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, 2000Hz and 4000Hz, 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. $CO_2$ laser to adjust precisely the wavelength. The optical fiber is very sensitive in the thermal variation around. Thus, When fabrication the prototype, it is applied a technique to compensate the optical thermal effect because the center wavelength at the output is shifted according to the thermal variation around. In summary, The prototype composed by eight cascaded MZI has an insertion loss of 5.5 dB, the bandwidth of 0.8nm at 0.5 dB point, and channel crosstalk of 25 dB. Furthermore, the loss dependent on polarization is measured as 0.06dB. Consequently, the output wavelength is shifted within 0.05 m when the surrounding temperature varies until $60^{\circ}C$
Keywords
DWDM; Optocal Multiplexer; Tempeature Compensation;
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