Optical waveguide type wavelength dispersion compensation device and method for manufacturing the same

Abstract

An optical waveguide type wavelength dispersion compensation device has an optical waveguide as a reflection type wavelength dispersion compensation means in which an equipment refraction index of a core changes unevenly over a light transmitting direction by changing a physical size of the core embedded in a clad. The core is designed in the following: (a) first, a first desired reflection spectrum is set with transmission losses neglected and an optical wavelength possible to compensate wavelength dispersion of an optical fiber to be compensated is then designed; (b) a wavelength dependency characteristic of a transmission loss in this optical waveguide is derived from an effective length of the optical waveguide designed in the process (a); and (c) next, a reverse dependency characteristic of the wavelength dependency is added to the first reflection spectrum to correct a second reflection spectrum and an equivalent refraction index distribution of the optical waveguide designed in the process (a) is re-designed by using the second reflection spectrum.

Description

technical field [0001] The present invention relates to a small optical waveguide type wavelength dispersion compensating device for compensating the wavelength dispersion of optical fiber and its manufacturing method. The device can be applied in optical fiber communication network and the like. [0002] This application claims priority based on Patent Application No. 2007-331006 for which it applied in Japan on December 21, 2007, and takes in the content into this application. Background technique [0003] In optical communication, wide-band and high-speed transmission of high-density wavelength multiplexing (DWDM: Dense Wavelength-Division Multiplexing) is constantly developing. In order to perform high-speed transmission, it is desirable for the transmission line to have as small a wavelength dispersion as possible in the transmission band, and to suppress nonlinear effects, it is desirable to use an optical fiber with non-zero wavelength dispersion. However, optical f...

AI Technical Summary

Problems solved by technology

[0020] 1: Dispersion compensation using DCF requires a larger space due to the use of longer optical fibers, making it difficult to miniaturize

Furthermore, there is a limit to the dispersion compensation characteristics that can be achieved

[0021] 2: There is a limit to the dispersion compensation characteristics that can be achieved using FBG's dispersion compensation

[0022] 3: There is a limit to the dispersion compensation characteristics that can be achieved by using the coincident dispersion compensation of FBG

[0024] 5: Using AWG PLC, the structure is complicated, the manufacturing is difficult, and the cost becomes higher

In addition, a large space is required, and it is difficult to miniaturize the device

[0025] 6: The structure of the VIPA type dispersion compensator is complicated, the manufacture is difficult, and the cost becomes high

Images