WDM和DWDM之间的区别

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. WDM：

   WDM代表波分复用。它是一种光纤传输技术，可以使用多个光波长(或颜色)在同一介质上发送数据。在一根光纤上可以传播两种或两种以上颜色的光，并且可以在光波导中以光谱上不同的波长或频率传输多个信号。

2. DWDM：
   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到光纤电缆上。这些模块通过使用紧密间隔的波长在同一根电缆上承载多个信号，进一步提高了系统带宽和容量。通道间隔减小到1.6 nm或更小。一种经济高效的方法，无需更换光纤即可增加容量。有一些商业系统可用，容量为32通道及以上。

WDM和DWDM之间的区别：

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.