公开(公告)号：CA2256188A1

公开(公告)日：1999-06-16

申请号：CA2256188

申请日：1998-12-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： ROEMISCH STEFANIA ,  GIRARDI RAFFAELE ,  CISTERNINO FRANCESCO ,  DE MARCHI ANDREA

IPC: G02F1/03 ,  H04B10/155 ,  H04J14/08 ,  H04L7/00 ,  G02F2/02 ,  H04J14/02

Abstract: The circuit includes an electro-optical mixer, such as an electro-optical Mach-Zehnder modulator, with non-linear behaviour. The modulator receives as input an optical signal at the frequency to be divided, in addition to an electric signal at a given frequency, usually corresponding to the frequency deriving from such division. The output optical signal from modulator exhibits a modulation spectrum containing the frequency difference between the frequency to be divided and at least one harmonic of the frequency of the above electric signal. After having been converted into an electric signal, the output signal of the mixer is subjected to a filtering action to extract the above frequency difference component. This latter one is then used both as electrical signal for the mixing, and as output signal from the divider. The preferred application is to OTDM systems, to extract a synchronism signal at tributary signal frequency.

公开(公告)号：IT1296646B1

公开(公告)日：1999-07-14

申请号：ITTO971097

申请日：1997-12-16

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CISTERNINO FRANCESCO ,  DE MARCHI ANDREA ,  GIRARDI RAFFAELE ,  ROEMISCH STEFANIA

IPC: H04B10/155 ,  H04J14/08 ,  G02F1/03 ,  H04L7/00

Abstract: The circuit includes an electro-optical mixer, such as an electro-optical Mach-Zehnder modulator (2), with non-linear behaviour. The modulator (2) receives as input an optical signal (Pin) at the frequency to be divided, in addition to an electric signal (e3) at a given frequency, usually corresponding to the frequency deriving from such division. The output optical signal (Pout) from modulator (2) exhibits a modulation spectrum containing the frequency difference between the frequency to be divided and at least one harmonic of the frequency of the above electric signal. After having been converted into an electric signal (e1), the output signal of the mixer is subjected to a filtering action (8) to extract the above frequency difference component. This latter one is then used both as electrical signal (e3) for the mixing, and as output signal from the divider (e2). The preferred application is to OTDM systems, to extract a synchronism signal at tributary signal frequency.

公开(公告)号：CA2256188C

公开(公告)日：2002-02-12

申请号：CA2256188

申请日：1998-12-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CISTERNINO FRANCESCO ,  DE MARCHI ANDREA ,  ROEMISCH STEFANIA ,  GIRARDI RAFFAELE

IPC: G02F1/03 ,  H04B10/155 ,  H04J14/08 ,  H04L7/00 ,  G02F2/02 ,  H04J14/02

Abstract: The circuit includes an electro-optical mixer, such as an electro-optical Mach-Zehnder modulator, with non-linear behaviour. The modulator receives as input an optical signal at the frequency to be divided, in addition to an electric signal at a given frequency, usually corresponding to the frequency deriving from such division. The output optical signal from modulator exhibits a modulation spectrum containing the frequency difference between the frequency to be divided and at least one harmonic of the frequency of the above electric signal. After having been converted into an electric signal, the output signal of the mixer is subjected to a filtering action to extract the above frequency difference component. This latter one is then used both as electrical signal for the mixing, and as output signal from the divider. The preferred application is to OTDM systems, to extract a synchronism signal at tributary signal frequency.

公开(公告)号：DE924552T1

公开(公告)日：2000-03-02

申请号：DE98123513

申请日：1998-12-15

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： CISTERNINO FRANCESCO ,  DE MARCHI ANDREA ,  GIRARDI RAFFAELE ,  ROEMISCH STEFANIA

IPC: G02F1/03 ,  H04B10/155 ,  H04J14/08 ,  H04L7/00 ,  G02F1/35

Abstract: The circuit includes an electro-optical mixer, such as an electro-optical Mach-Zehnder modulator (2), with non-linear behaviour. The modulator (2) receives as input an optical signal (Pin) at the frequency to be divided, in addition to an electric signal (e3) at a given frequency, usually corresponding to the frequency deriving from such division. The output optical signal (Pout) from modulator (2) exhibits a modulation spectrum containing the frequency difference between the frequency to be divided and at least one harmonic of the frequency of the above electric signal. After having been converted into an electric signal (e1), the output signal of the mixer is subjected to a filtering action (8) to extract the above frequency difference component. This latter one is then used both as electrical signal (e3) for the mixing, and as output signal from the divider (e2). The preferred application is to OTDM systems, to extract a synchronism signal at tributary signal frequency.