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Optical transmitter Test

PreviousActive Optical DevicesNextOptical receiver Test

Last updated 6 years ago

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  • 一、光纤系统传输的码型
  • 1. 对于电接口
  • 2. 对于光接口
  • 二、光发送机的工作原理 (电进光出)
  • 调制
  • 三、光发送机性能指标
  • 平均发送功率
  • 消光比

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一、光纤系统传输的码型

1. 对于电接口

对于 PCM

E1: 2 Mbit/s, HDB3

E2: 8 Mbit/s, HDB3

E3: 34 Mbit/s, HDB3

E4: 139 Mbit/s, CMI

E1指一次集群, 以此类推。这里的E和Ethernet(以太网)没有关系!!

无效知识,我自己过了两个月都不知道和上下文有什么联系了
###### 对于 Ethernet

**Eth(Ethernet)**: 10 Mbit/s,曼彻斯特编码(Manchester Encoding)

**FE(Fast_Ethernet)**: 100 Mbit/s,曼彻斯特编码(Manchester Encoding)

**GE(Gigabit_Ethernet)**: 1000 Mbit/s,曼彻斯特编码(Manchester Encoding)

2. 对于光接口

For SDH(Synchronous optical networking)

STM-1: 155 Mb/s, NRZ encoding

STM-4: 622 Mb/s, NRZ encoding

STM-16: 2488 Mb/s, NRZ encoding

STM-64: 9953 Mb/s, NRZ encoding

STM: Synchronous Transport Module

无效知识,我自己过了两个月都不知道和上下文有什么联系了
###### For Ethernet

**Eth(Ethernet)**: 10 Mbit/s,mBnB

**FE(Fast_Ethernet)**: 100 Mbit/s,mBnB

**GE(Gigabit_Ethernet)**: 1000 Mbit/s,mBnB

> mBnB take m bits of the original data and encode them into n bits

二、光发送机的工作原理 (电进光出)

假设上面的图,左边是A端,右边是B端

复用时,B端的接口速率一定 > A端的接口速率

复用: 左边 多线进, 右边 单线出

APC: Automate Power Control

调制

直接调制

  • 调制简单、损耗小,成本低

  • 啁啾(chirp)现象: 发射激光的波长随着调制电流的变化而变化

  • 用于速率 2.5 Gbit/s 以下系统

间接调制

  • 调制复杂,损耗大

  • 无啁啾(chirp)现象

  • 用于速率 2.5 Gbit/s 以上系统

三、光发送机性能指标

平均发送功率

01等概率,即正常工作时的发送功率

01等概率: 010 => 01 10 01

PT=10⋅lg⁡(P1mW)P_T = 10 \cdot \lg(\frac{P}{1mW})PT​=10⋅lg(1mWP​)

单位是 dBm

消光比

发送全1时的光功率发送全0时的光功率\frac{\text{发送全1时的光功率}}{\text{发送全0时的光功率}}发送全0时的光功率发送全1时的光功率​

extinction ratio=10⋅(P11P00)\text{extinction ratio} = 10 \cdot (\frac{P_{11}}{P_{00}})extinction ratio=10⋅(P00​P11​​) ,此时的P,单位是mw。总单位是dBm

extinction ratio=3+PT−P00\text{extinction ratio} = 3 + P_T - P_{00}extinction ratio=3+PT​−P00​ ,此时的P,单位是dBm。总单位是dB