Analysis of High-Speed Parallel Optical Interconnection Technology

Parallel Optical Interconnection Technology

Along with the digitization process, data processing, storage and transmission have developed rapidly. High bandwidth makes short-distance Interconnection a bottleneck for system development. Due to factors such as loss and Crosstalk, the transmission distance in the case of high bandwidth of copper wire-based electrical interconnection is limited, and the cost also increases. In addition, excessive cables will increase the system weight and wiring complexity. Compared with electrical interconnection, multi-mode optical fiber-based optical interconnection has problems such as high bandwidth, low loss, no crosstalk, matching and electromagnetic compatibility, it has been widely used in high-speed Interconnection between cabinets, frames, and boards.

The relationship between the transmission distance and bandwidth is based on the Ethernet connection model with an error rate less than 10-12 gibit. The optical fiber is MHz. km, 50/125 vm multimode optical fiber. it can be seen that the transmission distance can reach 300 m at Gbps, while the transmission distance can reach 50 m at Gbps. parallel Optical Communication supports parallel transmission of multiple light sources, which can achieve long-distance transmission at a high bit rate ,. this is one reason for parallel optical interconnection.

Parallel Optical module and Band Optical Cable

Parallel Optical Interconnection is achieved through parallel optical modules and band optical cables. the parallel optical module is based on VCSEL arrays and PIN arrays, with a wavelength of 50/125 nm. It is suitable for Multimode Optical Fiber 62.5 vm and/125vm. in the encapsulation, the electrical interface adopts the standard MegArray connector, and the optical interface adopts the standard MTP/MPO Band Optical Cable. currently, the commonly used parallel optical modules include four-channel transceiver and 12-channel transceiver modules.

It is an integrated transceiver module. It has four transmitting channels and four receiving channels. Each channel can have a speed of up to 3.125 Gbps, and the total interconnect capacity can reach 12.5Gbps.

And 12-channel transmitting and receiving modules respectively. Each channel provides a 32.6 Gbps transmission rate, and the total interconnection capacity can reach Gbps.

No matter whether it is a 4-channel transceiver module or a 12-channel transceiver module, the interconnection between the modules uses 12-channel MTP/MPO Band Optical Cable.

Application of parallel optical modules

1. optical backplane of a high-speed Router

High-speed routers use optical backplane, which greatly simplifies the wiring complexity and is very suitable for unlimited expansion of router capacity.

2. InfiniBand

InfiniBand application 6.

3. blade servers in the supercomputer

As a supercomputer is computed by multiple CPUs in parallel and has a large data processing and switching capacity, optical interconnection is an ideal choice for its internal connections. In a supercomputer system, four parallel optical modules are generally used.

4. Optical Fiber Channel

2X Optical Fiber Channel generally uses the 2.125GbpsSFP module, and its interconnection is 7:

The parallel module and SFP module are connected by fan-out (Figure 9). The SFP module is replaced by the parallel module, which can save board space and power consumption, thus reducing costs.

Outlook

The development of optical interconnection will be popularized in the next five years from inter-rack interconnection to inter-board interconnection. within ten years, the interconnection between chips will be realized. The parallel optical module can transmit data at a rate of 5 Gbps per channel within the year. Due to the significant increase in usage, the cost will be close to or even lower than that of electrical interconnection.

1. Test Module for DTX-XFM Optical Cable
2. Analysis of Automatic Optical Cable Monitoring System