公开(公告)号：US5129021A

公开(公告)日：1992-07-07

申请号：US634880

申请日：1991-01-10

申请人： David B. Mortimore ,  David B. Payne ,  Benjamin J. Ainslie

发明人： David B. Mortimore ,  David B. Payne ,  Benjamin J. Ainslie

IPC分类号： G02B6/28

CPC分类号： G02B6/2856

摘要： An optical 1.times.N star coupler has a single mode input fibre (I) and N single mode output fibres (O.sub.1) forming an output fibre assembly. The output fibres (O) are tapered within a former (2) which holds each output fibre (O) so it is positioned substantially identically relative to the remaining output fibres. The input fibre (I) is also tapered such that the fundamental mode field of the input fibre (I) and output fibre assembly are substantially equal. The identical relative positions of the output fibres (O) provides a wavelength independent 1.times.N star coupler.

公开(公告)号：US06574406B2

公开(公告)日：2003-06-03

申请号：US09950488

申请日：2001-09-11

申请人： Benjamin J. Ainslie ,  Monica K. Davis ,  Matthew J. Dejneka ,  David A. S. Loeber ,  Raymond P. Smith

发明人： Benjamin J. Ainslie ,  Monica K. Davis ,  Matthew J. Dejneka ,  David A. S. Loeber ,  Raymond P. Smith

IPC分类号： G02B602

CPC分类号： G02B6/03694 ,  G02B6/02052 ,  G02B6/03622 ,  G02B6/274 ,  G02B6/29319 ,  H01S3/094003 ,  H01S3/094053 ,  H01S3/0941

摘要： The invention provides a selectively absorbing optical fiber that is transparent at pump wavelengths, and highly absorbing at signal wavelengths. The selectively absorbing optical fiber includes selectively absorbing species, such as rare earth ions, in concentrations sufficient to provide the desired absorbance selectivity. The fiber is useful as a fiber pigtail for pump lasers in optical amplifiers, where it can reduce the effects of multi-path interference by absorbing stray light with wavelengths in the signal band.

公开(公告)号：US4974933A

公开(公告)日：1990-12-04

申请号：US52979

申请日：1987-05-22

申请人： Benjamin J. Ainslie ,  Howard P. Girdlestone

发明人： Benjamin J. Ainslie ,  Howard P. Girdlestone

IPC分类号： C03B37/012 ,  C03C3/32 ,  C03C13/04 ,  G02B6/02 ,  G02F1/355 ,  G02F1/365

CPC分类号： G02F1/365 ,  C03B37/01211 ,  C03B37/01274 ,  C03C13/04 ,  C03C3/321 ,  G02B6/02 ,  G02F1/3551 ,  C03B2201/30 ,  C03B2201/40 ,  C03B2205/02

摘要： Optical fibre contains a colloidal semiconductor dispersed in the core or the cladding or both. The fibre may have active regions in which the semiconductor is dispersed and passive regions in which the semiconductor is dissolved. This is obtained by drawing a preform to get fibre in which the semiconductor is dispersed and selected portions (or else the whole fibre) are treated to precipitate the semiconductor in colloidal form.

公开(公告)号：US4799946A

公开(公告)日：1989-01-24

申请号：US28213

申请日：1987-03-20

申请人： Benjamin J. Ainslie ,  Susan P. Craig

发明人： Benjamin J. Ainslie ,  Susan P. Craig

IPC分类号： G02B6/00 ,  C03B37/018

CPC分类号： C03B37/01807 ,  C03B2201/28 ,  C03B2201/31 ,  C03B2201/34

摘要： Rare earth elements, e.g. Nd, are introduced into optical glass fibre for telecommunications by evaporating a suitable salt, e.g. NdCl.sub.3, from a glass sponge into the gas stream used to deposit core material. Preferred sponges are in the form of tubes having an outer impervious layer and an inner porous layer. These sponges are conveniently made by MCVD and the impregnation is preferably carried out using an alcoholic solution of the impregnant.