公开(公告)号：EP1131864A4

公开(公告)日：2002-11-13

申请号：EP99957740

申请日：1999-11-17

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  BRODZELI ZOURAB

IPC: G02B6/12 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H01S3/16 ,  H01S3/1055 ,  H01S3/131 ,  H01S3/17

CPC classification number: H01S3/0675 ,  G02F1/3523 ,  H01S3/10076 ,  H01S3/1608

Abstract: Output power fluctuations in a distributed feedback laser arrangement (1) are reduced by inducing a saturable absorption grating in a saturable absorption region. Light is coupled into a DFB region (2) and amplified in an amplification region (4). A feedback loop (5) reflects a portion of the amplified light, and the counter-propagating beams induce an absorption grating in a saturable absorption region which suppresses output oscillations. The amplification region (4) can comprise an erbium doped fiber, and the saturable absorption region can comprise an underpumped portion of such a fiber, or a further length of such fiber, or a planar waveguide.

公开(公告)号：EP1082627A4

公开(公告)日：2002-03-13

申请号：EP99924590

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  SCEATS MARK

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B5/28

CPC classification number: G02B6/02152 ,  G02B5/1857 ,  G02B6/02133 ,  G02B6/02138 ,  G02B2006/02157 ,  G03H1/0476 ,  G03H2001/0482 ,  Y10S430/146

Abstract: At least two beams of light form an interference pattern (39) for writing a grating structure on a photosensitive waveguide (38), where the interference pattern (39) is controlled by modulating the relative phase of the beams. The modulation may be via an electro-optic, magneto-optic, or acousto-optic phase modulator (34), or via a mechanically driven phase modulator (34) comprising a wedge, waveplate or phase mask. In the latter case the phase mask can also act as a beamsplitter (33) for forming the beams. Extended gratings can be written by moving the waveguide (38) while controlling the relative phase shift, and can comprise chirped, apodized and arbitratry grating profiles. Noise can be reduced via an optoelectronic feedback loop. In one embodiment the relative phase is modulated via an electro-optic modulator (32) acting on a polarized beam, which is then split into two beams by a polarisation beamsplitter (33) such that one beam passes through a half-wave plate (34), to form interference pattern (39).

公开(公告)号：DE69906282D1

公开(公告)日：2003-04-30

申请号：DE69906282

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  SCEATS MARK

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B5/28

Abstract: A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising providing at least two light beams which overlap in an overlap region to form an interference pattern; moving the photosensitive waveguide through the overlap region; and modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties. The apparent movement of the interference pattern may be variably controlled to match the movement of the waveguide, or to be deliberately detuned. The grating structure may be chirped or apodized.

公开(公告)号：DE69930868D1

公开(公告)日：2006-05-24

申请号：DE69930868

申请日：1999-11-17

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  BRODZELI ZOURAB

IPC: G02B6/12 ,  H01S3/1055 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H01S3/131 ,  H01S3/16 ,  H01S3/17

Abstract: Output power fluctuations in a distributed feedback laser arrangement are reduced by inducing a saturable absorption grating in a saturable absorption region. Light is coupled into a DFB region and amplified in an amplification region. A feedback loop reflects a portion of the amplified light, and the counter-propagating beams induce an absorption grating in a saturable absorption region which suppresses output oscillations. The amplification region can comprise an erbium doped fiber, and the saturable absorption region can comprise an underpumped portion of such a fiber, or a further length of such fiber, or a planar waveguide.

公开(公告)号：DE69906282T2

公开(公告)日：2004-02-05

申请号：DE69906282

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  SCEATS MARK

IPC: G02B5/18 ,  G02B6/02 ,  G02B6/10 ,  G02B5/28

Abstract: A method of writing a grating structure with at least one of predetermined amplitude, period and phase properties in a photosensitive waveguide, the method comprising providing at least two light beams which overlap in an overlap region to form an interference pattern; moving the photosensitive waveguide through the overlap region; and modulating the phase of at least one of the light beams relative to the phase of the other light beams using a non-mechanical beam modulator so that the interference pattern appears to move through the overlap region, the apparent movement being variably controlled in response to the movement of the photosensitive waveguide such that a grating structure is written with the at least one of predetermined amplitude, period and phase properties. The apparent movement of the interference pattern may be variably controlled to match the movement of the waveguide, or to be deliberately detuned. The grating structure may be chirped or apodized.

公开(公告)号：AU739506B2

公开(公告)日：2001-10-11

申请号：AU4124099

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  SCEATS MARK

IPC: G02B5/28 ,  G02B6/10

公开(公告)号：CA2332992C

公开(公告)日：2009-12-22

申请号：CA2332992

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： SCEATS MARK ,  STEPANOV DMITRII

IPC: G02B5/28 ,  G02B5/18 ,  G02B6/02 ,  G03F7/00

Abstract: At least two beams of light form an inter-ference pattern (39) for writing a grating structure on a photosensitive waveguide (38), where the in-terference pattern (39) is controlled by modulat-ing the relative phase of the beams. The modula-tion may be via an electro-optic, magneto-optic, or acousto-optic phase modulator (34), or via a mechanically driven phase modulator (34) com-prising a wedge, waveplate or phase mask. In the latter case the phase mask can also act as a beam-splitter (33) for forming the beams. Extended gratings can be written by moving the waveguide (38) while controlling the relative phase shift, and can comprise chirped, apodized and arbitra-try grating profiles. Noise can be reduced via an optoelectronic feedback loop. In one embodi-ment the relative phase is modulated via an elec-tro-optic modulator (32) acting on a polarized beam, which is then split into two beams by a polarisation beamsplitter (33) such that one beam passes through a half-wave plate (34), to form interference pattern (39).

公开(公告)号：AU765547B2

公开(公告)日：2003-09-25

申请号：AU1536200

申请日：1999-11-17

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  BRODZELI ZOURAB

IPC: H01S3/1055 ,  H01S3/131 ,  H01S3/17

公开(公告)号：CA2348996A1

公开(公告)日：2000-05-25

申请号：CA2348996

申请日：1999-11-17

Applicant: UNIV SYDNEY

Inventor： BRODZELI ZOURAB ,  STEPANOV DMITRII

IPC: G02B6/12 ,  G02F1/35 ,  H01S3/06 ,  H01S3/067 ,  H01S3/10 ,  H01S3/16 ,  H01S3/1055 ,  H01S3/131 ,  H01S3/17

Abstract: Output power fluctuations in a distributed feedback laser arrangement (1) ar e reduced by inducing a saturable absorption grating in a saturable absorption region. Light is coupled into a DFB region (2) and amplified in an amplification region (4). A feedback loop (5) reflects a portion of the amplified light, and the counter-propagating beams induce an absorption grating in a saturable absorption region which suppresses output oscillation s. The amplification region (4) can comprise an erbium doped fiber, and the saturable absorption region can comprise an underpumped portion of such a fiber, or a further length of such fiber, or a planar waveguide.

公开(公告)号：CA2332992A1

公开(公告)日：1999-12-09

申请号：CA2332992

申请日：1999-05-28

Applicant: UNIV SYDNEY

Inventor： STEPANOV DMITRII ,  SCEATS MARK

IPC: G02B5/18 ,  G02B6/02 ,  G02B5/28

Abstract: At least two beams of light form an interference pattern (39) for writing a grating structure on a photosensitive waveguide (38), where the interference pattern (39) is controlled by modulating the relative phase of the beams. Th e modulation may be via an electro-optic, magneto-optic, or acousto-optic phas e modulator (34), or via a mechanically driven phase modulator (34) comprising a wedge, waveplate or phase mask. In the latter case the phase mask can also a ct as a beamsplitter (33) for forming the beams. Extended gratings can be writt en by moving the waveguide (38) while controlling the relative phase shift, and can comprise chirped, apodized and arbitratry grating profiles. Noise can be reduced via an optoelectronic feedback loop. In one embodiment the relative phase is modulated via an electro-optic modulator (32) acting on a polarized beam, which is then split into two beams by a polarisation beamsplitter (33) such that one beam passes through a half-wave plate (34), to form interferen ce pattern (39).