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    • 3. 发明授权
    • WDM PON based on DML
    • 基于DML的WDM PON
    • US07991291B2
    • 2011-08-02
    • US12028675
    • 2008-02-08
    • Yasuhiro MatsuiKevin McCallion
    • Yasuhiro MatsuiKevin McCallion
    • H04B10/04H04B10/00H04J14/02H04J14/00
    • H04J14/0226H04B10/272H04J14/0227H04J14/0246H04J14/025H04J14/0282
    • Low-cost FP lasers can be implemented in the upstream links of a WDM PON system by configuring them for single-mode operation. In a typical embodiment, an FP laser at a subscriber unit is injection seeded with CW seed light from a DFB laser or an ASE source at a central office to enable single-mode operation of the FP laser. The FP laser is directly modulated and the resulting optical data signal is transmitted upstream to the central office. At the central office, an optical spectrum reshaper/bandpass optical filter is positioned in front of an optical receiver to enhance the extinction ratio of the optical data signal and generate a vestigial sideband. A wavelength locker can also be implemented at the central office to stabilize the wavelength of the master DFB laser and the injection-seeded FP laser.
    • 低成本FP激光器可以通过将其配置为单模操作在WDM PON系统的上游链路中实现。 在典型的实施例中,在用户单元处的FP激光器用来自DFB激光器的CW种子光或在中心局的ASE光源注入,以实现FP激光器的单模操作。 FP激光器被直接调制,所得到的光学数据信号在上游传输到中心局。 在中央办公室,光谱整形/带通滤光器位于光接收器的前面,以增强光数据信号的消光比并产生残留边带。 还可以在中心局实现波长锁定器,以稳定主DFB激光器和注射种子FP激光器的波长。
    • 9. 发明授权
    • Delay line interferometer multiplexer
    • 延迟线干涉仪多路复用器
    • US09031359B2
    • 2015-05-12
    • US13463565
    • 2012-05-03
    • Yasuhiro MatsuiBernd HuebnerCharles B. Roxlo
    • Yasuhiro MatsuiBernd HuebnerCharles B. Roxlo
    • G02F1/01G02F1/035G02B6/293H04J14/02
    • G02B6/29355G02B6/2938H04J14/02
    • In an embodiment, a delay line interferometer (DLI) multiplexer (MUX) includes a first stage and a second stage. The first stage includes a first DLI and a second DLI. The first DLI includes a first left input, a first right input, and a first output and has a free spectral range (FSR) that is about four times a nominal channel spacing. The second DLI includes a second left input, a second right input, and a second output and has an FSR that is about four times the nominal channel spacing. The second stage is coupled to the first stage and includes a third DLI. The third DLI includes a third left input optically coupled to the first output, a third right input optically coupled to the second output, and a third output. An FSR of the third DLI is about two times the nominal channel spacing.
    • 在一个实施例中,延迟线干涉仪(DLI)多路复用器(MUX)包括第一级和第二级。 第一阶段包括第一DLI和第二DLI。 第一DLI包括第一左输入,第一右输入和第一输出,并且具有约为标称通道间隔的四倍的自由光谱范围(FSR)。 第二DLI包括第二左输入,第二右输入和第二输出,并具有约为标称通道间隔的四倍的FSR。 第二阶段耦合到第一阶段并且包括第三DLI。 第三DLI包括光耦合到第一输出的第三左输入,光耦合到第二输出的第三右输入和第三输出。 第三个DLI的FSR约为标称信道间隔的两倍。