HDMI光纤，DVI光纤等等所延伸的产品都带有光纤的名词，为什么这么受欢迎的，现在就已经是普及了，光纤有着怎样的技术让群众这么的着迷，从HDMI光纤所在用的情况当中可以看出，一条HDMI的产品竟然可以发挥的这么的极致，往往会没想到只是一根简简单单的线材里面包含这样的技术在里面，其中的技术一定要让大家认识认识。
HDMI fiber, DVI fiber and so on the products are extended with fiber terminology, why so popular, and now is already popular, and what kind of fiber technology so that the masses so fascinated by the use of HDMI fiber where the situation Can be seen that an HDMI product can play so extreme, often never thought of just a simple wire which contains such a technology inside, where the technology must let everyone know the understanding.
首看HDMI光纤线里面的一个特点，使用了光纤的技术都会有的，就是抗干扰能力强，这个点就是非常的突出，其实在HDMI线里面是有种缺憾在里面，干扰的性能可能会比较的差一点。数字调制是光纤通信的主要调制方式，将模拟信号抽样量化后，以二进制数字信号“1”或“0”对光载波进行通断调制，并进行脉冲编码（PCM）。数字调制的优点是抗干扰能力强，中继时噪声及色散的影响不积累，因此可实现长距离传输，它的缺点是需要较宽的频带，设备也复杂。
First look at a feature inside the HDMI fiber optic cable, the use of fiber technology will have, that is, anti-interference ability, this point is very prominent, in fact, inside the HDMI cable is a kind of regret in the inside, the interference performance may be compared The difference. Digital modulation is the main modulation method of optical fiber communication. After the analog signal is sampled, the optical carrier is on and off by the binary digital signal "1" or "0", and the pulse code (PCM) is carried out. Digital modulation has the advantage of strong anti-interference ability, relay noise and dispersion of the impact is not accumulated, it can achieve long-distance transmission, its shortcoming is the need for a wide band, the device is also complex.
按调制方式与光源的关系来分，有直接调制和外调制两种。前者指直接用电调制信号来控制半导体光源的振荡参数（光强、频率等），得到光频的调幅波或调频波，这种调制又称内调制；后者是让光源输出的幅度与频率等恒定的光载波通过光调制器，光信号通过调制器实现对光载波的幅度、频率及相位等进行调制，光源直接调制的优点是简单，但调制速率受到载流子寿命及高速率下的性能退化的限制（如频率啁啾等）。外调制方式需要调制器，结构复杂，但可获得优良的调制性能，尤其适合于高速率下运用。
According to the relationship between modulation and light source points, there are two kinds of direct modulation and external modulation. The former refers to the direct use of electrical modulation signal to control the oscillation parameters of the semiconductor light source (light intensity, frequency, etc.), to obtain the optical frequency of the amplitude modulation or FM wave, this modulation, also known as internal modulation; the latter is to light output amplitude and frequency And other constant optical carrier through the optical modulator, optical signal through the modulator to achieve the amplitude of the optical carrier, frequency and phase modulation, the advantages of light source modulation is simple, but the modulation rate by the carrier life and high rate Performance degradation restrictions (such as frequency chirp, etc.). External modulation requires a modulator, complex structure, but can get excellent modulation performance, especially suitable for high-speed use.
