Xuchuang Institute of Technology released the industry's first high-power, antireflective laser

Recently, Xuchuang Technology Research Institute launched the latest research results - the industry's first high-power, antireflection laser. This laser breaks through the dependence of traditional lasers on isolators, and can realize the more advantageous transmission performance in small size pluggable external light source module (ELSFP) and photoelectric co sealing (CPO), and provide continuous light source (CW). The related papers and achievements of the new laser will be published in detail in OFC 2023.

Initiate a new laser structure, discard the isolator, simplify the packaging and reduce the cost

High power semiconductor lasers have been widely used as indispensable monochromatic light sources in communication, laser radar, sensor and other fields. However, traditional lasers are particularly sensitive to reflection due to their positive feedback amplification process. Even - 20dB reflection into the laser will cause coherent collapse. This problem has plagued the industry for the past three decades. Therefore, in practical applications, most semiconductor lasers need isolators to work stably.

Based on the physical mechanism of optical electrical interaction, Xuchuang Institute of Technology has optimized the design and adopted an innovative laser structure to design the industry's first high-power, antireflection laser, with an output power of 100mW. Under the same reflection conditions, its relative intensity noise is reduced by at least two orders of magnitude compared with traditional lasers, making this high-power laser work stably without isolator. From the cost point of view, since the cost of the isolator is equivalent to that of the laser, abandoning the isolator will directly reduce the cost by half.

Left: high-power, antireflection laser chip; Middle figure: LIV curve of laser; Right: 100G transmission performance under reflection

Help Xuchuang Silicon Optics and CPO layout to create more market possibilities

The high-power laser released this time uses a special waveguide design, which improves the coupling efficiency of the laser and fiber, while avoiding the differential loss caused by the isolation zone, making this high-power laser more advantageous in ELSFP modules, silicon optical and photoelectric co encapsulation. The test results show that the laser can fully meet the requirements of IEEE 802.3 without isolator; The transmission performance of the 100G transmission system with the laser as the light source has not deteriorated under reflection conditions.

The application of this laser may greatly reduce the procurement and production costs of Xuchuang optical module business. Relying on its own silicon optical technology advantages and this new laser, Xuchuang Technology is expected to provide customers with more competitive optical module products. More importantly, this high level of innovation has built a very high technical threshold and once again strengthened Xuchuang's technological leadership in the industry. At the same time, the laser is also suitable for laser radar, sensor and other fields, and will accelerate Xuchuang's exploration progress towards a new track.

Since this year, Xuchuang Technology Research Institute has successively released self-developed EDA software PIC Palette silicon painting, and reflow compatible high-density optical connectors (the research results will be published in Optics Express). The high-power, antireflection laser released this time is another major achievement of Xuchuang Technology Research Institute this year.

Source: Zhongji Xuchuang