POLARIZATION STABILIZATION SCHEME FOR UN-COOLED SELF-TUNING CAVITY FOR COLORLESS ULTRA BROADBAND PON
    2.
    发明申请
    POLARIZATION STABILIZATION SCHEME FOR UN-COOLED SELF-TUNING CAVITY FOR COLORLESS ULTRA BROADBAND PON 审中-公开
    用于无色无线超宽带PON的无冷却自调谐的偏振稳定方案

    公开(公告)号:WO2012140186A1

    公开(公告)日:2012-10-18

    申请号:PCT/EP2012/056753

    申请日:2012-04-13

    Abstract: The present document relates to the field of optical access networks. In particular, the present document relates to an optical transmitter, in particular (but not exclusively) for a WDM (Wavelength Division Multiplexing) passive optical network, and to a WDM PON comprising such an optical transmitter. An optical transmitter arrangement (7) is described. The arrangement (7) comprises a first mirror (41) and a second mirror (64) at a first end and a second end of a cavity, respectively; an optical amplifier (63) configured to amplify light polarized in a first polarization plane; wherein the optical amplifier (63) is positioned within the cavity upstream the first mirror (64); an optical waveguide (5-2) configured to transmit light from the optical amplifier (63) to the second mirror (41) and vice versa; a first non-reciprocal polarization rotator (82) positioned within the cavity upstream of the optical amplifier (63) and downstream of the optical waveguide (5-2); and a second non-reciprocal polarization rotator (81) positioned within the cavity upstream of the optical waveguide (5-2) and downstream of the first mirror (41); wherein the first (82) and second (81) non-reciprocal polarization rotators are configured to rotate the polarization of the light such that light which re-enters the optical amplifier (63) after having been reflected by the second mirror (41) is polarized in the first polarization plane.

    Abstract translation: 本文件涉及光接入网络领域。 特别地,本文件涉及用于WDM(波分复用)​​无源光网络的光发射机,特别是(但不排他地))以及包括这种光发射机的WDM PON。 描述了一种光发射器装置(7)。 装置(7)分别包括位于空腔的第一端和第二端的第一反射镜(41)和第二反射镜(64) 光放大器(63),被配置为放大在第一偏振面中偏振的光; 其中所述光放大器(63)位于所述第一反射镜(64)上游的空腔内; 配置为将光从所述光放大器(63)传输到所述第二反射镜(41)的光波导(5-2),反之亦然; 位于光放大器(63)上游并位于光波导(5-2)下游的空腔内的第一非倒数偏振旋转器(82); 以及位于所述光波导(5-2)上游并位于所述第一反射镜(41)下游的空腔内的第二非互易偏振旋转器(81)。 其中所述第一(82)和第二(81)不可逆偏振旋转器被配置为旋转所述光的偏振,使得在被所述第二反射镜(41)反射之后重新进入所述光放大器(63)的光是 在第一极化平面中极化。

    TUNABLE ADD/DROP OPTICAL DEVICE
    4.
    发明申请
    TUNABLE ADD/DROP OPTICAL DEVICE 审中-公开
    TUNABLE ADD / DROP光学器件

    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

    Inventor: ITALTEL S.P.A.

    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。

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