Delay equalizer for optical fiber transmission path

Abstract

Abstract PURPOSE:To make possible transmission of a wide band in the wavelengths other than zero dispersion wavelength of the transmission path by constituting the wavelength dispersion of the transmission path through the use of the photo circuits consisting of two lenses and four diffraction gratings. CONSTITUTION:Diffraction gratings 2 and 3, 4 and 5 are so disposed as to oppose with each other and become parallel with each other. The exit light from a transmission path 7 passes through a lens 1 then through the respective diffraction gratings and enters a photo detector 8 out through the lens 6. The dispersion value of the transmission path may be made zero at a certain wavelength and the delay time by wavelengths may be equalized by finely adjusting the distances l between the four diffraction gratings. Since this delay equalizer for optical transmission path is so constituted as to compensate the wavelength dispersion of the transmission path by the photo circuits, the total dispersion may be made zero even in transmission of wavelengths other than the zero dispersion wavelength and an extra wider band may be realized.

Inventors

• 👤 Akira Sugimura
• 👤 Kazuhiro Oguro
• 👤 Nobuyuki Imoto

Bibliographic Details