Apodised binary Bragg grating
AssigneeOclaro Technology Limited
InventorsDouglas Charles John Reid, Andrew John Ward
Life of this patent
Estimating the term…
Abstract
An apodised Bragg grating comprises a base grating section formed by a base order 5 periodic pattern of marks and spaces. The Bragg grating further comprises one or more apodised grating sections that are formed by a periodic pattern of marks and spaces, each defined by the base order pattern from which at least some of the marks are missing. The determination of which marks are missing may be performed by combining the base order pattern with a higher order modulation envelope function.
Claims15
An apodised Bragg grating comprising:
- a base grating section having a base order periodic pattern of marks and spaces, and
- an apodised grating section adjacent to the base grating section;
- wherein the base order pattern of marks and spaces continues from the base grating section into the apodised grating section, and
- wherein the base order pattern within the apodised grating section is configured as modulated by a periodic envelope function which is higher order than the base order so that some of the marks of the base order pattern are missing in a periodically repeating manner, the apodised grating section having a configuration of the pattern of marks and spaces defined as “x/m”, where “m” is the order of the envelope function and “x” is the number of marks of the base order pattern remaining per period of the envelope function.
A binary apodised Bragg grating comprising a concatenation of grating sections, the grating pattern in each section being defined by a periodic base order pattern of marks and spaces wherein at least one grating section is configured as modulated by a periodic envelope function which is higher order than the base order so that some of the marks of the base order pattern are missing in a periodically repeating manner, the at least one grating section having a configuration of the pattern of marks and spaces defined as “x/m”, where “m” is the order of the envelope function and “x” is the number of marks of the base order pattern remaining per period of the envelope function.
A method of manufacturing an apodised Bragg grating, comprising forming a base grating section comprising a base order periodic pattern of marks and spaces, and forming one or more apodised grating sections,
- wherein the base order pattern of marks and spaces continues from the base grating section into an adjacent apodised grating section, and
- wherein the base order pattern within each apodised grating section is modulated by a periodic envelope function which is higher order than the base order so that some of the marks of the base order pattern are missing in a periodically repeating manner, the apodised grating section having a configuration of the pattern of marks and spaces defined as “x/m”, where “m” is the order of the envelope function and “x” is the number of marks of the base order pattern remaining per period of the envelope function.
Dependencies are inferred from the claim text.