What is a single mode optical module and a multimode optical module,optical module price
Optical modules are widely used in today's life. In ordinary times, the optical network transmission we use is inseparable from the function of optical modules. There are also single mode optical modules and multimode optical film blocks in the optical module. So, what is the price of single-mode optical modules and multi-mode optical modules?
First, let's take a look at what is a single-mode optical module and what is a multi-mode optical module.
Single mode optical modules are often used for long distance data transmission. Single-mode optical modules are less limited in their use, so they are more widely used than multimode optical modules.
The optical module used in conjunction with the multimode fiber to obtain the best transmission characteristics is called a multimode optical module, which can transmit multiple modes of light. Multimode optical modules are generally used for short-distance transmission because they limit the frequency at which digital signals are transmitted due to large dispersion between modes.
Under the same conditions, the price of a single-mode optical module is more expensive than that of a multi-mode optical module. Why is this? Have such a question. In fact, this is not difficult to understand, please see the difference between the following single mode optical module and multimode optical module. After reading it, you will know.
The difference between single mode optical module and multimode optical module
What are single-mode optical modules and multi-mode optical modules? What is the price of optical modules?
(1) different wavelengths
The operating wavelength of a multimode optical module is generally 850 nm, and the operating wavelength of a single mode optical module is generally 1310 nm and 1550 nm.
(2) Different transmission distances
Single-mode optical modules are often used for long-distance transmission with transmission distances of up to 150 to 200 km. The multimode optical module is used for short-distance transmission with a transmission distance of up to 5km.
(3) Single mode in different optical modules of optical fiber type, actually only refers to the type of optical fiber. According to the transmission mode of the optical module in the optical fiber, it can be divided into a single mode fiber and a multimode fiber.
The multimode fiber is referred to as MMF, and the fiber diameter is generally 50/125 μm or 62.5/125 μm. The single mode fiber is referred to as SMF, and the fiber diameter is 9/125 μm.
(4) different light sources
The light source of the multimode optical module is a light emitting diode or a laser, and the light source of the single mode optical module is an LD or an LED with a narrow spectral line.
(5) Different application scope
Multimode optical modules are mostly used for short-distance transmission such as SR. There are many nodes and connectors in this type of network. The use of multi-mode optical modules can reduce costs.
Single-mode optical modules are mostly used in lines with relatively high transmission rates, such as metropolitan area networks. In addition, multimode devices can only operate efficiently on multimode fibers, while singlemode devices operate efficiently on both single-mode and multimode fibers.
(6) different costs(optical module price)
The single-mode optical module uses twice as many devices as multimode optical modules, so the overall cost of a single-mode optical module is much higher than that of a multi-mode optical module.