-
公开(公告)号：JP2000098315A
公开(公告)日：2000-04-07
申请号：JP26738599
申请日：1999-09-21
Applicant: LUCENT TECHNOLOGIES INC
Abstract: PROBLEM TO BE SOLVED: To make it possible to obtain a variable attenuator not including a moving portion by forming a variable refractive index region so as to have a refractive index higher than the refractive index of a clad layer in order to change the mode propagating in a core. SOLUTION: The optical fiber optical device for changing the propagation mode of light is obtained by constituting an optical fiber 22 of a certain length so as to have one attenuation portion or plural variable refractive(VRI) index regions 40. The VRI regions 40 comprise the material having the refractive index higher than the refractive index of the core or clad layer and is regulatable in the refractive index from either the inside or the outside. The change in the refractive index is executed by, for example, changing the length, shape and width of the VRI regions 40, or changing the concentration of the dopant to be implanted to the VRI regions 40 and fluctuating the parameters of the time or temperature. The refractive index is changed by the fluctuation in electric field, magnetic field and stress applied from the outside and the fluctuation in parameters, such as temperature.
-
公开(公告)号：JP2000098317A
公开(公告)日：2000-04-07
申请号：JP26967599
申请日：1999-09-24
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROLAND PATRICIO ESPINDRA , STENTZ ANDREW J , WAGENER JEFFERSON LYNN
Abstract: PROBLEM TO BE SOLVED: To correct the waveguide characteristic of a basic mode by disposing a tapered optical fiber in the longitudinal direction where a part of light signal is introduced to the outside of the fiber and enclosing the region with a coating acting on a part of the light signal emitted from the optical fiber in order to correct the propagation characteristic. SOLUTION: The tapered region 18 is enclosed by a coating 24 of variable refractive index or variable loss material. The tapered region 18 executes an operation free from loss to guide a portion, where a basic mode M cannot be disregarded, into the coating 24 enclosing the cladding 16 beyond the cladding 16 or to the outer side thereof when light passes the tapered region 18. The reason why such operation is executed lies in that the diameter ODCORE of the core diminishes. Consequently, the boundary of the basic mode M is weakened and, therefore, the basic mold field diameter increases. When the basic mode M spreads to the outer side of the cladding 16, the propagation action of the basic mode M is selectively changed.
-
3.发明专利
公开(公告)号：JP2000241618A
公开(公告)日：2000-09-08
申请号：JP2000040847
申请日：2000-02-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROLAND PATRICIO ESPINDRA , WAGENER JEFFERSON LYNN
Abstract: PROBLEM TO BE SOLVED: To reduce loss of a shorter wavelength channel by correcting net negative dispersion and gradient of the dispersion of at least two signal channels and all signal channels, with a model including DCG. SOLUTION: A plurality of wavelength signal channels at wavelength λ1
-
Patent Agency Ranking
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
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：JPH1184152A
公开(公告)日：1999-03-26
申请号：JP18600498
申请日：1998-07-01
Applicant: LUCENT TECHNOLOGIES INC
Abstract: PROBLEM TO BE SOLVED: To write Bragg diffraction gratings into an optical fiber. SOLUTION: This method includes a process for manufacturing the Bragg reflection diffraction gratings using a phase mask and an amplitude mask device for manufacture of a Bragg reflector. The Bragg reflection diffraction gratings have the periods larger than the periods of the conventional short period diffraction gratings but much smaller than the periods of the conventional long-period diffraction gratings. This short-period Bragg reflection diffraction gratings have periods in a range of, for example, 1 to 10 μm. The method of manufacture includes the arrangement of the amplitude mask having internally formed suitable slits on a photosensitive waveguide to be manufactured, then irradiation of the waveguide through the slits and the consequent introduction of the periodic patterns of refractive index fluctuations which are the characteristic of the Bragg reflector by light. The short-period Bragg diffraction gratings generated by this amplitude mask are the reflection diffraction gratings having the reflection characteristics attaining nearly 99.99%. The reflective diffraction gratings manufactured according to this method are advantageous in applications, such as adding and decreasing of channels into a wavelength division multiplex system and the detection of the stabilization and structural imperfectness of a laser.
-
公开(公告)号：JP2000221339A
公开(公告)日：2000-08-11
申请号：JP2000016436
申请日：2000-01-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , EGGLETON BENJAMIN JOHN , ROLAND PATRICIO ESPINDRA , JIN SUNGHO , MAVOORI HAREESH , ROGERS JOHN A , STRASSER THOMAS ANDREW
Abstract: PROBLEM TO BE SOLVED: To make it possible to produce a grating device having a wide band width, freely regulatable dispersibility and amplitude responsiveness by adding an extrinsic gradient to a waveguide and changing the range of the chirp in an intrinsic chirp type grating region. SOLUTION: The grating device 10 is manufactured by providing the device with the waveguide of a certain length like an optical fiber 11 having a grating region 12 in the waveguide. The grating region 12 has nonuniformly parted fluctuation parts and reflects the intrinsic chirp type grating. When the extrinsic gradient or force is impressed to the waveguide, the range of the chirp changes. First and second magnetic elements 15a and 15b attracts or repels to or from each other to introduce an elastic strain to the optical fiber 11 of the grating region. A gradient forming main body 14 is mounted on the optical fiber 11. As a result, the device which can include the grating of a certain range and the wide band width may be formed by using low temperature and weak force. The regulation of the dispersibility and amplitude responsiveness of the grating is possible as well.
-
公开(公告)号：JP2000164955A
公开(公告)日：2000-06-16
申请号：JP33130199
申请日：1999-11-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROLAND PATRICIO ESPINDRA , STRASSER THOMAS ANDREW , WAGENER JEFFERSON LYNN , WYSOCKI PAUL FRANCIS
Abstract: PROBLEM TO BE SOLVED: To obtain good temperature compensation in an optical amplifier of temperature-dependent rare-earth doped waveguide. SOLUTION: An optical amplifier 10 of temperature-dependent rare-earth doped waveguide (for example, EDFA erbium-doped fiber amplifier) is compensated by a temperature-dependent loss filter 14. The characteristics of the filter 14 as a temperature-dependent loss filter are designed such that gain characteristics are compensated in all active operation temperature range. The amplifier 10 includes an optical waveguide 11 for transmitting an optical signal, rare-earth doped amplifying regions 12A and 12B in the optical waveguide 11 for amplifying the transmitted optical signal, pumping sources 13a and 13B for carrying out the optical pumping of the amplifying regions 12A and 12B, and the temperature-dependent loss filter 14. In a typical design, EDFA is compensated to the fluctuation within 1 dB, at the temperature range from -40 to 85 deg.C in at least a spectral range of 20 nm. In an embodiment, the loss filter 14 includes a plurality of filters with the central wavelength shifts which differ according to the temperature.
-
公开(公告)号：JP2000089046A
公开(公告)日：2000-03-31
申请号：JP25647099
申请日：1999-09-10
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ABRAMOV ANATOLI A , EGGLETON BENJAMIN JOHN , ROLAND PATRICIO ESPINDRA , HALE ARTURO
IPC: H01S3/06 , G02B6/00 , G02B6/02 , G02B6/34 , G02F1/01 , H01S3/067 , H01S3/10 , H04B10/17 , H04B10/29 , G02B6/10 , H04B10/16
Abstract: PROBLEM TO BE SOLVED: To obtain an optical fiber diffraction grating clad which is intensified in the sensitivity of material for the purpose of a reconstitution characteristic by arranging plural heating elements, generating a temperature gradient along the length of diffraction gratings, and chirping the diffraction gratings. SOLUTION: The device 9 has an optical fiber 11 of a certain length having a series of the optical diffraction gratings 12 having refractive index perturbation 13 and plural heating elements 10 along the diffraction gratings 12. The optical fiber 11 usually has a central core 14, an external cladding 15 and an external coating 16 of the temperature sensing material. The heating elements 10 are made of resistant metals for correcting the diffraction gratings 12 by local heating. When operating, the electric signals impressed to the heating elements 10 establish the temperature gradient at the coating along the diffraction gratings 12, thereby changing the refractive index of the coating. This change effectively chirps the diffraction gratings 12. The heating elements 10 are arranged at uniform intervals and are capable of establishing the desirable gradient by changing the effective heating capacity (for example, the number of coils) thereof.
-
-
-
-
-
-
-
Search Results
8
records
(took 0.029 seconds)
