公开(公告)号：WO1998004942A1

公开(公告)日：1998-02-05

申请号：PCT/EP1997003969

申请日：1997-07-22

Applicant: ITALTEL S.P.A. ,  FINCATO, Antonio ,  LENZI, Maurizio

Inventor： ITALTEL S.P.A.

IPC: G02B06/34

CPC classification number: G02B6/2938 ,  G02B6/29352

Abstract: The present invention finds its application in an on-line control system of an optic fibre transmission network, supporting or destined to support optic signals in a second ( lambda 1) and/or third ( lambda 2) window and including the transmission by means of said fiber of a control signal having a band or wavelength ( lambda 3) out of said second and third window. The system employs a single Mach-Zehnder interferometer as insertion and extraction device of said third service optic channel or optic band ( lambda 3), consisting of: a first and a second directional coupler having a first L1 and a second L2 coupling length, respectively; a phase shifting stage suitable to introduce an optic path DELTA L difference. Parameters L1, L2 and DELTA are dimensioned in such a way to satisfy some pre-set relations.

Abstract translation: 本发明将其应用于光纤传输网络的在线控制系统，其支持或预定用于在第二（λ1）和/或第三（λ2）窗口中支持光信号，并且包括通过 所述光纤具有在所述第二和第三窗口之外具有波段（λ3）的控制信号。 该系统采用单个马赫 - 策德尔干涉仪作为所述第三服务光纤通道或光纤带（λ3）的插入和提取装置，其由分别具有第一L1和第二L2耦合长度的第一和第二定向耦合器组成 ; 适于引入光路DELTA L差的相移级。 参数L1，L2和DELTA的大小设置为满足一些预设关系。

公开(公告)号：WO1998004954A1

公开(公告)日：1998-02-05

申请号：PCT/EP1997003972

申请日：1997-07-23

Applicant: ITALTEL S.P.A. ,  FINCATO, Antonio ,  LENZI, Maurizio ,  DI MOLA, Domenico

Inventor： ITALTEL S.P.A.

IPC: G02F01/313

CPC classification number: G02F1/3136 ,  G02F1/0147

Abstract: Tunable add/drop optical device for injecting or extracting (add/drop) at least a selected optical channel or carrier wavelength in or from a set of multiplexed channels or carriers of different wavelengths comprising a plurality of directional couplers (AD1... AD6) and a plurality of phase-shift stages (SF1...SF5) alternately connected in cascade, wherein each phase-shift stage defines a certain optical path length difference ( DELTA L1... DELTA L5) between two distinct optical paths of the stage. The tuning is performed modifying the refraction index of one path of said phase shift stages by means of Joule effect heating strips (L1... L5) or by means of metallic field plates adapted to receive a signal suitable to modify the electric field intensity. The first two phase-shift stages of said plurality of phase-shift stages have differences of length of optical paths different from each other and in a preestablished ratio while the remaining phase-shift stages have differences of length of optical paths identical. It is thus possible to provide a device having an exceptionally flat cross response characteristic, substantially free of ripple due to an inevitable truncation of the Fourier expansion series.

Abstract translation: 包括多个定向耦合器（AD1 ... AD6）的不同波长的多路复用信道或载波集合中的至少一个选择的光信道或载波波长的可调谐分插光学装置， 和串联交替连接的多个相移级（SF1 ... SF5），其中每个相移级在该级的两个不同的光路之间定义一定的光程长度差（DELTA L1 ... DELTA L5） 。 通过焦耳效应加热条（L1 ... L5）或借助适于接收适合于修改电场强度的信号的金属场板来修改所述相移级的一个路径的折射率。 所述多个相移级的前两个相移级具有彼此不同的并且处于预定比的光路的长度差，而剩余的相移级具有相同的光路长度差。 因此，可以提供具有特别平坦的交叉响应特性的装置，由于傅立叶展开系列的不可避免的截断，基本上没有纹波。

公开(公告)号：WO1998004943A1

公开(公告)日：1998-02-05

申请号：PCT/EP1997003970

申请日：1997-07-23

Applicant: ITALTEL S.P.A. ,  CHIARETTI, Guido ,  FINCATO, Antonio

Inventor： ITALTEL S.P.A.

IPC: G02B06/34

CPC classification number: G02B6/29352 ,  G02B6/12007

Abstract: Optical module for access networks to wide band communication systems of the type including at least: a first multiplexer in wavelength (WDM1) suitable to receive in input an optical support (1), coming from a predetermined side of the module (MO); a second optical support (3), one end of which is adapted to correspond on said predetermined side of the optical module (MO); a reflecting element placed downstream from one of the optical branches of said first multiplexer in wavelength (WDM1). According to the invention, the said second output of the first mutliplexer in wavelength (WDM1) is connected to a second multiplexer in wavelength (WDM2) of the propagating and counterpropagating type, preferentially implemented by means of a Mach-Zehnder interferometer, incorporating said reflecting element (5). The other end of said second optical support (3) is connected to a port of said second multiplexer in wavelength (WDM2).

Abstract translation: 用于接入网络的光模块，其类型至少包括：波长第一多路复用器（WDM1），适于在输入端接收来自模块（MO）的预定侧的光学支架（1）; 第二光学支撑件（3），其一端适于在所述光学模块（MO）的所述预定侧上对应; 在波长（WDM1）中放置在所述第一多路复用器的一个光分支的下游的反射元件。 根据本发明，波长（WDM1）中的第一多路复用器的所述第二输出连接到传播和反向传播类型的波长（WDM2）中的第二多路复用器，优选地通过马赫 - 曾德干涉仪实现，其包括所述反射 元素（5）。 所述第二光学支架（3）的另一端以波长（WDM2）连接到所述第二多路复用器的端口。