Etched diffraction grating device with uniform channel loss and flat passband response

Abstract

The invention discloses an etched diffraction grating (EDG) device with uniform channel loss and flat passband response. Based on a traditional EDG design, each tooth surface of a grating reflection tooth surface is connected by a plurality of discrete spots to from a curved surface; the spectral response passband of a device is correspondingly divided into a plurality of discrete spots; each discrete spot on each grating reflection tooth surface meets an interference strengthening condition for a corresponding wavelength in the pectral response passband, so as to realize flat passband response; meanwhile the reflection direction of a grating reflection surface deviates from a routine blazed grating reflection direction, allowing light energy to scatter nearby an output waveguide array after transmission of a plate zone so as to realize uniform channel loss. Under the condition of not changing EDG components and not introducing extra devices, the EDG device increases the bandwidth of each channel, and meanwhile improves EDG loss uniformity; the EDG device is suitable for waveguide structures of various materials based on indium phosphide, silicon dioxide, silicon, etc., and has the advantages of simple manufacture, low cost, etc.

Description

technical field [0001] The invention relates to an integrated etching diffraction grating device, in particular to an etching diffraction grating device with uniform channel loss and flat passband response. Background technique [0002] Currently, there are two types of integrated optical waveguide grating wavelength division multiplexing devices used for optical communication: arrayed waveguide grating (abbreviated as AWG) and etched diffraction grating (abbreviated as EDG). Among them, the etched diffraction grating has the advantages of compact structure, easy integration, little influence by process tolerance, and high reliability. The N×N EDG wavelength router can realize N between N input and output channels through N wavelengths. 2 A link connection greatly increases the data transmission capacity of the system and is an important component of the all-optical routing system. However, since the Free Spectral Region (FSR) of EDG wavelength routers is generally small a...

AI Technical Summary

Problems solved by technology

[0005] In view of the deficiencies in the background technology, the purpose of the present invention is to propose an etched diffraction grating device with uniform loss between channels and flat passband response, which solves the problem that the insertion loss of each output channel of the traditional etched diffraction grating is quite different, and the passband response is flat at the same time. Responsive flat design can relax performance requirements of other parts in the optical communication system

Images