公开(公告)号：US20140308046A1

公开(公告)日：2014-10-16

申请号：US13927927

申请日：2013-06-26

Applicant: Broadcom Corporation

Inventor： William BLISS ,  John WANG

IPC: H04B10/2507

CPC classification number: H04B10/2507 ,  H04B10/69 ,  H04B10/695 ,  H04B10/697 ,  H04B10/6971

Abstract: Systems and methods for optical multi-path interference (MPI) compensation are provided. In an embodiment, a mean MPI signal representing a mean amplitude of the MPI in an input signal is generated and subtracted from a first estimate of transmitted amplitude of the input signal to generate a mean MPI compensated estimate of transmitted amplitude. The mean MPI compensated estimate of transmitted amplitude is sliced to generate a decision of transmitted amplitude of the input signal. The mean MPI signal can be generated using a mean MPI feedback loop or using an iterative feed-forward process. In another embodiment, mean MPI levels corresponding to respective transmitted intensity levels are generated and used to control slice levels of a slicer in order to compensate for MPI.

Abstract translation: 提供了光学多路径干扰（MPI）补偿的系统和方法。 在一个实施例中，产生表示输入信号中的MPI的平均幅度的平均MPI信号，并从输入信号的发送幅度的第一估计中减去，以产生发送振幅的平均MPI补偿估计。 传输幅度的平均MPI补偿估计被分片，以产生输入信号的发射幅度的决定。 可以使用平均MPI反馈回路或使用迭代前馈过程来生成平均MPI信号。 在另一个实施例中，产生对应于各个发射强度水平的平均MPI电平并用于控制限幅器的限幅电平以补偿MPI。

公开(公告)号：US20140321864A1

公开(公告)日：2014-10-30

申请号：US14041949

申请日：2013-09-30

Applicant: Broadcom Corporation

Inventor： William BLISS ,  John Wang

IPC: H04B10/54

CPC classification number: H04B10/541 ,  H04B10/58 ,  H04B10/588

Abstract: Embodiments for improving the Signal to Noise and Distortion (SINAD) ratio in Pulse Amplitude Modulation (PAM)-M optical intensity modulation systems, to enable higher data rate communications, are provided. Embodiments can be used to improve the linearity and reduce the distortion of electrical and electro-optics components (including optical modulators) in optical intensity modulation systems. Embodiments are well suited for use with PAM-M optical intensity modulators, such as segmented Vertical Cavity Surface Emitting Laser (WSEL) and segmented Mach-Zehnder Modulator (MZM), for example.

Abstract translation: 提供了用于改善脉冲幅度调制（PAM）-M光强度调制系统中的信噪比和失真（SINAD）比率的实施例，以实现更高的数据速率通信。 可以使用实施例来改善光强度调制系统中的电学和电光学部件（包括光学调制器）的线性并减小其失真。 实施例非常适用于例如PAM-M光强度调制器，例如分段垂直腔表面发射激光（WSEL）和分段马赫 - 曾德调制器（MZM）。

公开(公告)号：US20140112382A1

公开(公告)日：2014-04-24

申请号：US14136120

申请日：2013-12-20

Applicant: Broadcom Corporation

Inventor： William BLISS ,  Vasudevan PARTHASARATHY

IPC: H04B7/04 ,  H04L27/02 ,  H04L25/03

CPC classification number: H03M13/151 ,  H03M13/05 ,  H03M13/1515 ,  H04B7/0456 ,  H04L1/0041 ,  H04L1/0045 ,  H04L1/0057 ,  H04L25/03949 ,  H04L25/4917 ,  H04L27/00 ,  H04L27/02

Abstract: In conventional Backplane Ethernet systems, data is transmitted over two pairs of copper traces in one direction using a PAM-2 scheme and a baud rate of 10.3125 GHz, giving an effective bit rate of 10.3125 Gbps. The rate at which data can be transmitted in Backplane Ethernet systems, while still being reliably received, is typically limited by ISI caused by the dispersive nature of the copper traces, frequency dependent transmission losses caused primarily by skin effect and dielectric loss of the copper traces, and cross-talk from adjacent communication lines. The present invention is directed to systems for overcoming these and other signal impairments to achieve speeds up to, and beyond, twice the conventional 10 Gbps limit associated with Backplane Ethernet systems.

Abstract translation: 在传统的背板以太网系统中，使用PAM-2方案和10.3125 GHz的波特率，通过两对铜线路在一个方向上传输数据，给出10.3125 Gbps的有效比特率。 在背板以太网系统中数据传输的速率仍然可靠地接收，通常受到铜迹线色散性质引起的ISI的限制，主要由皮肤效应引起的频率依赖传输损耗和铜迹线的介电损耗 ，以及相邻通信线路的串扰。 本发明涉及用于克服这些和其他信号损伤的系统，以实现高达和超过与背板以太网系统相关联的常规10Gbps限制的两倍的速度。

公开(公告)号：US20150063828A1

公开(公告)日：2015-03-05

申请号：US14041924

申请日：2013-09-30

Applicant: Broadcom Corporation

Inventor： William BLISS ,  Vasudevan PARTHASARATHY

IPC: H04L25/03 ,  H04B10/25 ,  H04L27/04

CPC classification number: H04B10/25 ,  H04B2210/254 ,  H04L25/03343 ,  H04L25/4975

Abstract: Systems that allow for DFE functionality to be eliminated from the receiver side of a communication system and for a DFE-like functionality to be implemented instead at the transmitter side of the communication system are provided. By removing the DFE functionality from the receiver side, error propagation can be eliminated at the receiver and receiver complexity can be reduced drastically. At the transmitter side, the DFE-like functionality provides the same DFE benefits, and with the transmitter environment being noise-free, no errors can occur due noise boosting, for example. The DFE-like functionality at the transmitter side can be implemented using non-linear (recursive or feed-forward) pre-coders or a combination of non-linear pre-coders and linear filters, which can be configured to invert a net communication channel between the transmitter and the receiver. Embodiments particularly suitable for fiber optic channels and server backplane channels are also provided.

Abstract translation: 提供了允许从通信系统的接收机侧消除DFE功能并且在通信系统的发射机侧实现类似DFE的功能的系统。 通过从接收机侧去除DFE功能，可以在接收机处消除误差传播，并且可以显着降低接收机的复杂度。 在发射机侧，类似DFE的功能提供了相同的DFE优点，并且在发射机环境无噪声的情况下，例如，噪声提升不会发生错误。 可以使用非线性（递归或前馈）预编码器或非线性预编码器和线性滤波器的组合来实现发射机侧的类似DFE的功能，其可被配置为反转净通信信道 在发射机和接收机之间。 还提供了特别适用于光纤通道和服务器背板通道的实施例。

公开(公告)号：US20150003510A1

公开(公告)日：2015-01-01

申请号：US13930775

申请日：2013-06-28

Applicant: Broadcom Corporation

Inventor： William BLISS

IPC: H04L25/03

CPC classification number: H04L25/03057 ,  H04L25/03343 ,  H04L25/4975

Abstract: An asymmetric PHY pair for communicating over a point-to-point link is disclosed. The PHY pair is asymmetric in that the signal processing power used by one of the PHYs to communicate a unit of data over the link is made to be less than that of the other PHY. This asymmetry is accomplished not merely by reducing the signal processing power of one of the PHYs at the expense of the rate at which symbols can be communicated over the link, but by transferring the signal processing power from one of the PHYs to the other PHY so that the symbol rate can be substantially maintained as compared to the symbol rate of a symmetric PHY pair. The asymmetric PHY pair can be advantageously implemented in many different types of communication systems (i.e., in communication systems where one end is more congested and/or crowded than the other end).

Abstract translation: 公开了一种用于通过点对点链路进行通信的非对称PHY对。 PHY对是不对称的，因为PHY之一用于通过链路传送数据单元的信号处理能力小于其他PHY的信号处理能力。 这种不对称性不仅仅是通过降低PHY中的一个的信号处理能力来牺牲可以通过链路传送符号的速率，而是通过将信号处理能力从PHY之一传送到另一个PHY， 与对称PHY对的符号速率相比，可以基本上维持符号率。 非对称PHY对可以有利地实现在许多不同类型的通信系统中（即，在一端比另一端更拥挤和/或拥挤的通信系统中）。