公开(公告)号：AU740262B2

公开(公告)日：2001-11-01

申请号：AU7316098

申请日：1998-06-25

Applicant: CORNING INC

Inventor： GRASIS MICHAEL E ,  SCOBEY MICHAEL A ,  SPOCK DEREK E

IPC: H04J14/00 ,  G02B6/293 ,  G02B6/34 ,  H04J14/02

Abstract: An optical multiplexing device is provided comprising multiple wavelength division multiplexers cascaded together. A first one of the wavelength division multiplexers has a common port and multiple optical ports which are optically coupled to the common port. The common port may be optically coupled to a trunk line of a system employing wavelength division multiplexing, for example, a fiber-optic telecommunication system employing 4, 8, 16 or other number of multiplexed channels. The optical ports include multiple channel ports, each of which is transparent to a corresponding wavelength sub-range and reflective of other wavelengths. The second wavelength division multiplexer has a common port optically coupled to one of the optical ports of the first wavelength division multiplexer. The second wavelength division multiplexer also has multiple optical ports which are optically coupled to its common port and include multiple wavelength-selective channel ports. A waveguide, such as a fiber-optic line, can optically connect the common port of the second wavelength division multiplexer to an optical port of the first wavelength division multiplexer. The cascaded WDMs each may be optically coupled to the output of a passive coupler and a housing may be provided defining an enclosed space in which the optical multiplexing device is mounted. Optionally, additional WDMs may be cascaded with the first two WDMs in a parallel or branched formation, an in-line formation or some combination. Preferably, the channels are interleaved, such that they are removed from the multiplexed signal in certain non-sequential order. The optical multiplexing device also may employ compound interleaving wherein adjacent channels are multiplexed by different ones of the cascaded WDMs. The optical multiplexing devices can operate to add signals, remove signals or a combination of both.

公开(公告)号：AU6290801A

公开(公告)日：2001-08-27

申请号：AU6290801

申请日：2001-02-16

Applicant: CORNING INC

Inventor： BHATIA VIKRAM ,  HALLOCK ROBERT ,  HARRIS JAMES M ,  MURPHY EDWARD F ,  SPOCK DEREK E

IPC: H04B10/60 ,  H04B10/071 ,  H04B10/25 ,  H04B10/291 ,  H04B10/40 ,  H04B10/50 ,  H04J14/00 ,  H04J14/02

Abstract: Methods and apparatus for combining, adding, and/or dropping channels in optical communication systems that utilize thin film filters without the creation of deadbands, using fiber Bragg gratings and additional thin film optical filters, are described. According to one aspect of the invention, an optical filter is used to drop a wavelength range from an optical signal. Prior to the optical signal entering the optical filter, one or more fiber Bragg gratings and an optical circulator are used reflects a portion of the communications spectrum which would normally lie with the deadband region of the optical filter. According to another aspect of the present invention, an optical filter is used to combine a first optical signal and a second optical signal to form a combined optical signal. Neither the first optical signal nor the second optical signal includes channels within a deadband region of the optical filter. One or more fiber Bragg gratings and an optical circulator or a coupler are used to add a third optical signal to the combined optical signal. The third optical signal includes signal wavelengths within the deadband region of the optical filter.

公开(公告)号：CA2310586A1

公开(公告)日：1999-07-15

申请号：CA2310586

申请日：1998-12-10

Applicant: CORNING INC

Inventor： LAFRENIERE ROBERT W ,  SPOCK DEREK E ,  GRASIS MICHAEL E ,  SCOBEY MICHAEL A

IPC: G02B6/293 ,  G02B6/34 ,  H04J14/02 ,  G02B6/28

Abstract: An optical device has a filter assembly defining a light path, preferably a multi-bounce zigzag expanded beam light path, from a common port (36) at least to a first channel port (38) and then a second channel port (40) and then a pass-through port (32). The first channel port (38) has a first optical filter element (48), which is transparent to a wavelength sub-range within the wavelength range passed by the common port (36) and the pass-through port (32), and substantially reflective of other wavelengths within such wavelength range. The second channel port (40) includes a second optical filter element (60) having light transmittance and reflectance properties substantially the same as those of the first optical filter element (38). The optical multiplexing device can be used to extract or drop a selected wavelength subrange, most typically a single channel signal, from the multiplexed light, and to then inject a new signal into the multiplexed light at that same wavelength sub-range.