WDM和DWDM的区别

在本文中，我们将讨论 WDM(波分复用)和 DWDM(密集波分复用器)之间的区别。让我们一一讨论。

1. 波分复用：

   WDM 代表波分复用。它是一种光纤传输技术，可以使用多种光波长(或颜色)通过同一介质发送数据。可以在一根光纤上传输两种或多种颜色的光，并且可以在光波导中以光谱上的不同波长或频率传输多种信号。

2. 数字波分复用：
   DWDM 代表密集波分复用器。这些模块将来自不同来源的数据放在一根光缆上。这些模块通过使用间隔很近的波长在同一条电缆上传输多个信号，进一步增加了系统带宽和容量。通道间距减小到 1.6 nm 或更小。无需更换光纤即可增加容量的经济高效方式。有容量为 32 通道及以上的商用系统。

WDM和DWDM的区别：

SR.NO	WDM	DWDM
1.	WDM uses a number of light sources, each emits the light of different wavelength.	DWDM is WDM utilizing closely spaced channels.
2.	In this, Optical multiplexer is used at the input side to multiplex these signals.	In this, DWDM assigns the incoming optical signals to specific frequencies multiplexes them for transport over a single fiber.
3.	All the signals arrive at the same time, instead of being distributed across time slots.	In this, multiple channels of information carried over the same fiber, each using an individual wavelength.
4.	It improve the capability of optical cable in carrying data by multiplexing many channel of wavelengths.	It increases the bandwidth of systems, without using repeaters.
5.	The channel spacing is reduced to 1.6 nm or less.	The channel spacing is small 200GHZ.
6.	The band used are O and C.	The band used are C and L.
7.	It cost per channel is low.	It cost per channel is high.
8.	The number of channels delivered are 2.	There is hundreds of channels is possible.
9.	The best application is PON.	The best application is Long-haul.