公开(公告)号：JP2000022245A

公开(公告)日：2000-01-21

申请号：JP10155099

申请日：1999-04-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MELIGA MARINA ,  PAOLETTI ROBERTO ,  SCOFET MARCO ,  TALLONE LUIGI

IPC: G02B6/42 ,  H01S3/08 ,  H01S5/026 ,  H01S5/12 ,  H01S5/14

Abstract: PROBLEM TO BE SOLVED: To provide a laser module which can shorten a full length of a cavity. SOLUTION: A laser module 1 includes a Fabry-Pero cavity active element 2 having a facet 3 for carrying an anti-reflection film thereon, and an external cavity defined by an optical fiber Bragg grating having a low reflection factor. The grating 5 exhibits a modulation profile having a reflection factor asymmetrical and non-uniform in a length direction of the grating. Thereby a position on an equivalent mirror surface is offset toward an end of the grating 5 closer to the active element 2.

公开(公告)号：JPH11326657A

公开(公告)日：1999-11-26

申请号：JP10154799

申请日：1999-04-08

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BOSCHIS LAURA ,  GNAZZO ANGELANTONIO ,  ROSSOTTO ORIANA ,  TALLONE LUIGI

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/124 ,  G02B6/10

Abstract: PROBLEM TO BE SOLVED: To obtain a grating which has a narrow reflection factor spectrum distant from a 2nd lobe and reduced equivalent length. SOLUTION: A grating 10 formed in the core of an optical fiber 1 has a modulation profile, which is uneven and asymmetrical in refractive index along the length and the profile is represented with a curve which gradually and monotonously increases from a minimum value which is substantially zero to a maximum value. Here, the minimum value has a substantially horizontal tangent and corresponds to the end of the grating 10 and the maximum value also has a substantially horizontal tangent and corresponds to the other end of the grating 10.

公开(公告)号：JPH10319255A

公开(公告)日：1998-12-04

申请号：JP15077798

申请日：1998-05-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BOSCHIS LAURA ,  ROSSOTTO ORIANA ,  TALLONE LUIGI

IPC: G02B6/13 ,  B29D11/00 ,  G02B20060101 ,  G02B5/18 ,  G02B5/26 ,  G02B6/02 ,  G02B6/10 ,  G02B6/124 ,  G02B6/136 ,  G02B6/255 ,  G02B6/293 ,  G02B6/34

Abstract: PROBLEM TO BE SOLVED: To provide a method and a device for uniformly irradiating all fibers or waveguides for writing a grating. SOLUTION: This method and a device simultaneously form the same Bragg grating in a different optical fiber or waveguide, the fiber/waveguide 1 is mounted in line on a common supporting base 2 together with a phase mask 3 and the phase mask 3 gives the desired intensity distribution to a radiating beam for writing a grating. The common supporting base 2 is moved back and forth in the lateral direction to the longitudinal axis of the fiber or the waveguide at appropriately low frequency so as to expose the fiber/waveguide to the radiating beam for a time enough to start changing the refractive index when each fiber/waveguide passes through the radiating beam.

公开(公告)号：CA2268428C

公开(公告)日：2001-12-04

申请号：CA2268428

申请日：1999-04-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MELIGA MARINA ,  PAOLETTI ROBERTO ,  SCOFET MARCO ,  TALLONE LUIGI

IPC: G02B6/42 ,  H01S3/08 ,  H01S5/026 ,  H01S5/12 ,  H01S5/14 ,  H01S3/1055

Abstract: A laser module comprises a Fabry-Perot cavity active element with a facet bearing an anti-reflection coating and an external cavity made by an optical fibre Bragg grating with low reflectivity. This grating presents a non-uniform profile of modulation of the refractive index, asymmetrical in the direction of the grating length, such as to give rise to a position of the equivalent mirror plane that is offset towards the end of the grating that is closer to the active element.

公开(公告)号：DE949518T1

公开(公告)日：2000-04-20

申请号：DE99106984

申请日：1999-04-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： BOSCHIS LAURA ,  ROSSOTTO ORIANA ,  GNAZZO ANGELANTONIO ,  TALLONE LUIGI

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/124 ,  G02B6/16 ,  G02B6/12

Abstract: A grating (10) made in the core of an optical fibre (1) presents a non-uniform and asymmetrical profile of the modulation of the refractive index in the direction of the length, which profile is represented by a curve that rises gradually and monotonically from a minimum and substantially null value, with substantially horizontal tangent, in correspondence with an end of the grating (10), until a maximum value, also with substantially horizontal tangent, which is reached in correspondence with the other end of the grating (10).

公开(公告)号：ITTO910492A1

公开(公告)日：1992-12-29

申请号：ITTO910492

申请日：1991-06-28

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GRECO GIORGIO ,  TALLONE LUIGI

IPC: G01J20060101 ,  G01J3/12 ,  G01J3/26

公开(公告)号：IT1305114B1

公开(公告)日：2001-04-10

申请号：ITTO981064

申请日：1998-12-21

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： TALLONE LUIGI ,  BOSCHIS LAURA ,  EMELLI ENRICO ,  ROSSOTTO ORIANA

IPC: G02B5/18 ,  G02B20060101 ,  G02B5/26 ,  G02B6/02 ,  G02B6/10

公开(公告)号：CA2268428A1

公开(公告)日：1999-10-10

申请号：CA2268428

申请日：1999-04-09

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： SCOFET MARCO ,  TALLONE LUIGI ,  MELIGA MARINA ,  PAOLETTI ROBERTO

IPC: G02B6/42 ,  H01S3/08 ,  H01S5/026 ,  H01S5/12 ,  H01S5/14 ,  H01S3/1055

Abstract: A laser module comprises a Fabry-Perot cavity active element with a facet bearing an anti-reflection coating and an external cavity made by an optical fibre Bragg grating with low reflectivity. This grating presents a non-uniform profile of modulation of the refractive index, asymmetrical in the direction of the grating length, such as to give rise to a position of the equivalent mirror plane that is offset towards the end of the grating that is closer to the active element.

公开(公告)号：CA2173564A1

公开(公告)日：1996-10-06

申请号：CA2173564

申请日：1996-04-04

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： TALLONE LUIGI

IPC: G01N21/21 ,  G01M11/00 ,  G01N21/41 ,  G01N21/45 ,  G01N21/59 ,  G01N21/43

Abstract: A light beam is sent on a wafer (4), at different angles of incidence, thus giving rise to fluctuations in the transmittance of the wafer, as the angle of incidence varies, because of interference due to multiple reflections of the beam inside the wafer (4). The transmittance of the wafer (4) is measured as the angle of incidence varies; the angular positions of transmittance maxima and minima are determined with respect to a maximum or minimum corresponding to normal incidence, and the refractive index is obtained from these positions and from the number of maxima and minima in the different angles. The device performing the method is also provided.

公开(公告)号：IT1249939B

公开(公告)日：1995-03-30

申请号：ITTO910492

申请日：1991-06-28

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： GRECO GIORGIO ,  TALLONE LUIGI

IPC: G01J3/12 ,  G01J3/26 ,  G01J

Abstract: The radiation to be analysed is sent onto an interference filter (6) which selects different portions of the radiation spectrum in correspondence with different incidence angles. The intensity values of the radiation outgoing from the element (6) are stored by a measuring and data processing unit (9) which processes such values with the transfer function of the element to obtain the information on the spectrum.