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Two Technologies Used in Interfaces of Active Optical Cables

Regarding the photoelectric conversion interface of the active optical cable, it can be realized by two technologies, which will be described in detail below.

1. Silicon optical technology used in the interfaces of active optical cables

Silicon optical technology is also called complementary metal oxide semiconductor (CMOS) process technology, and optical signals can be converted and transmitted by electric current.

It converts current into a light source and transmits a signal through an Edge Emitting Laser (EEL), and a corrected optical lens must be used to aggregate light with a wavelength of 1310 nanometers (nm) near the component for transmission. We have sfp28 cable for sale.

The EEL, on the other hand, is made of wafer material that transmits signals in parallel to the component layer and the exit side via the high refractive index difference between the air and the wafer material.

2. The vertical resonant cavity surface-emitting laser used in the interfaces of active optical cables

As a reliable and professional 100g qsfp28 supplier, we share with you that the vertical resonant cavity surface emitting laser uses a laser array to introduce the outer electrons into a thin area to simulate the quantum tunneling response, couples the optical cable to transmit the signal, and the generated current will be introduced into the high reflectivity mirror and distributed Bragg Reflector;

The Bragg mirror can hold the signal in the medium and oscillate vertically in a direction perpendicular to the surface, so that the light escapes to the surface only through the wrapped circular beam output opening, resulting in lower frequency reflections on the fiber wall.

The Vertical Resonant Cavity Surface Emitting Laser (VCSEL) used in active optical cable interfaces is now the preferred solution due to its low cost, low power consumption and high performance. The optical transceivers market has witnessed a lot.

Its low-level current characteristics are favorable for the realization of high-density laser arrays, and the light is emitted in the vertical direction, the small divergence angle and the circularly symmetric far and near field distribution make it easy to couple with the fiber without the need for Complex and expensive beam shaping systems.

With the rapid development of data centers and the increase in user needs, in order to meet the needs of users, the transmission rate of optical communication transmission has also increased and developed, from the previous 155M, 1.25G, 10G, 25G to today's 100G, 200G, 400G, etc.

Facing the high-speed, high-density, low-cost, and low-power requirements of short-distance data centers on optical interconnect products, AOC active optical cables provide excellent solutions.

3. Introduction to 200G AOC Active Optical Cable

200G AOC has two types: QSFP28-DD AOC and QSFP56 AOC. The wavelength is 850nm. The QSFP56 package has four transmit and receive ports, but the transmission rate of each channel is as high as 56Gbps, and the modulation method is PAM4.

The QSFP28-DD package has eight transmit and receive ports, the transmission rate of each channel is 28Gbps, the modulation method is NRZ, and 200G AOC is applied to 200G Ethernet with a transmission distance of 1-100 meters.

200GAOC active optical cable to 2x 100G AOC, one end is connected to 1 200G optical module, and one end is connected to 2 100G optical modules, the maximum transmission rate is 212.5Gbps.

The power consumption of 200G optical module is less than 4W, and the power consumption of 100G optical module is less than 2.5W. Mainly used in data center 200G to 2-way 100G Ethernet branch link.

The 200G AOC to 4x 50G AOC adopts an 8-channel full-duplex active optical cable, one end is connected to a 200G optical module, and one end is connected to four 50G modules, and the maximum rate is up to 206.25Gbps.

The power consumption of 200G is less than 4W, and the maximum power consumption of each 50G module is less than 1.5W. Mainly used in data center 200G to 4-way 50G Ethernet branch link.

4. The working principle of 200G AOC active optical cable

The working principle of AOC is not much different. The electrical signal is input through the A terminal, and the electrical signal is converted into an optical signal of a specific wavelength through the electrical-optical conversion device. The optical signal is modulated and coupled and then input into the transmission optical cable;

After the optical signal reaches one end, the photoelectric detection device detects the optical signal, amplifies, processes and converts the optical signal, and outputs the corresponding electrical signal.

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