公开(公告)号：JP2000098164A

公开(公告)日：2000-04-07

申请号：JP26967099

申请日：1999-09-24

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ROLAND PATRICIO ESPINDRA ,  STENTZ ANDREW J ,  WAGENER JEFFERSON LYNN

IPC: G02B6/14 ,  G02B6/02 ,  G02B6/34 ,  H04B10/02 ,  H04B10/43 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To permit regulation or turning in order to supply different spectrum molding characteristics by enclosing the tapered region of a fiber with a coating in order to change the spectral molding characteristics of gratings, thereby correcting the effective waveguide refractive index of the basic mode of the fiber. SOLUTION: The fiber 12 includes the tapered region 18 including a portion 20 of the smallest outside diameter and two tapered thermal insulating portions 22. The tapered region 18 within the region of the gratings is covered by the coating 26 of a variable refractive index material. The tapered region 18 executes operation free from loss to introduce the portion where the basic mode cannot be disregarded to the coating 26 enclosing cladding 16 when light passes the tapered region 18. The coating 26 may be used to selectively correct the effective waveguide refractive index of the basic mode when the basic mode expands to the outside of the cladding 16. As a result, the turning or regulation of the optical spectrum molding characteristics of the grating is made possible.

公开(公告)号：JPH1154853A

公开(公告)日：1999-02-26

申请号：JP15700798

申请日：1998-06-05

Applicant: LUCENT TECHNOLOGIES INC

Inventor： REED WILLIAM ALFRED ,  STENTZ ANDREW J ,  STRASSER THOMAS A

IPC: G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/30

Abstract: PROBLEM TO BE SOLVED: To provide a cascaded Raman laser(CRL), which significantly increases conversion efficiency and is highly reliable. SOLUTION: In a CRL 30, which receives pumping radiation light of a wavelength λp and radiates emitted light of a wavelength λn which is longer than the wavelength λp , the CRL 30 consists of an optical fiber, which has L long cavities 21 arranged between an input region 34 and an output region 35 and has a certain length, the above input and output regions 34 and 35 respectively have fiber plug gratings having center wavelengths of λ1