Shulou(Shulou.com)06/02 Report--

The standard of multimode fiber grade is expressed by OM (optical multi-mode), and the bandwidth and maximum distance vary with different levels of transmission.

Species introduction

01 OM2 optical fiber

OM2 fiber, which was born in 1988, is a 50amp 125 mm graded index multimode fiber. It is based on the LED mode of light-emitting diodes in terms of standard and design, has low bandwidth requirements, and cooperates with LED for 100Mbit/s and lower rate transmission.

The core diameter and numerical aperture are relatively small, which effectively reduces the mode dispersion of multimode fiber, increases the bandwidth significantly, and reduces the production cost by 1. 3%.

02 OM3 optical fiber

With the commercial application of 850nm vertical emitting laser VCSEL (Vertical Cavity Surface Emitting Laser), it has rapidly become the main light source of multimode communication system. The spot size of VCSEL laser is about 30um, which has the advantages of good stability, long life and low price.

In order to improve the capacity and distance of multimode fiber transmission system based on 850nm VCSEL laser, OM3 fiber came into being.

Features:

The optical fiber is optimized to optimize the bandwidth of the optical fiber at the 850nm wavelength.

OM3 fiber regulates the "effective mode bandwidth" to ensure the transmission performance of the fiber when using VCSEL lasers. However, OM2 fiber has no requirement for "effective mode bandwidth".

03 OM4 optical fiber

OM4 is modified on the basis of OM3, which was born in 2009. It has wider modal bandwidth and better performance than OM3. OM4 is the most widely used medium for transmission of 40amp 100G.

Features:

The effective bandwidth developed for VSCEL laser transmission is more than twice that of OM3. OM4 is re-optimized on the basis of OM3 for better performance.

04 OM5 optical fiber

OM5 fiber jumper is a kind of laser-optimized multimode fiber jumper, which specifically specifies broadband characteristics for wavelength division multiplexing. OM5 fiber jumper, also known as broadband multimode fiber jumper, is suitable for high-bandwidth applications. It uses the wavelength division multiplexing technology of single-mode fiber to extend the range of available wavelengths for network transmission. It can support four wavelengths on a single-core multimode fiber and reduce the number of fiber cores to the previous 1max 4.

Parameter comparison

01 comparison of OM2/OM3/0M4OM5 parameters and specifications

1. OM2 refers to 50um or 62.5um core-diameter multimode fiber with 850/1300nm full injection bandwidth above 500/500MHz.km.

2. OM3 is a 50um core diameter multimode fiber optimized by 850nm laser. In 10Gb/s Ethernet with 850nm VCSEL, the optical fiber transmission distance can reach 300m.

3. OM4 is the upgraded version of OM3 multimode fiber, and the optical fiber transmission distance can reach 550m.

4. OM5 fiber jumper increases the effective mode bandwidth (EMB) at 850nm wavelength to 6000MHZ.km, and reaches 8000MHZ.km near 880nm wavelength.

02 OM2/OM3/0M4/OM5 function and feature comparison

1. OM2: both core diameter and numerical aperture are relatively small, which effectively reduces the mode dispersion of multimode fiber, significantly increases the bandwidth, and reduces the production cost.

2. OM3: the use of flame retardant skin can prevent the spread of flame, prevent the emission of smoke, acid gas and poison gas, and meet the need of 10 gb/s transmission rate.

3. OM4: generally speaking, the wavelength is 850max 1310nm and can only support one wavelength at a time.

4. The wavelength of OM5:OM5 optical fiber jumper is generally 850pm 1300nm and can support at least four wavelengths at one time.

03 OM2/OM3/0M4OM5 transmission function comparison

Jumper selection

OM3 and OM4 fiber optic cables are commonly used in cabling environments in data centers, supporting 10G or even 40max 100G high-speed Ethernet transmission.

OM5 fiber jumpers can support traditional applications like OM3/OM4 fiber jumpers, and they are fully compatible with OM3 and OM4 fiber jumpers and are highly interoperable.

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