According to the report of the American Physicists Organization Network on August 10 (Beijing time), Wei Yongqiang and colleagues at the Singapore Data Storage Institute have for the first time built a new type of silicon chip that integrates a laser and a grating. Making light stronger and ensuring that the laser emits light at wavelengths around 1500 nm, the standard operating wavelength of communication equipment is exactly 1500 nm.
Optical fibers need to pass laser beams of different wavelengths at the same time when transmitting data, but these different wavelengths of light waves are easy to crosstalk with each other, so it is necessary to precisely tune the laser so that it emits light of a specific wavelength to avoid such crosstalk. Using a raster can solve this problem.
Scientists used traditional methods to try to integrate a laser and a grating in a silicon chip, but none succeeded. Lasers are generally made up of several thin layers of semiconductor, while gratings are etched from silicon. All materials must be precisely aligned. The traditional method is to plant the laser and grating on a separate semiconductor chip. The whole process takes about 50 steps, and the surface roughness of the silicon crystal is required to be very low, less than 0.3 nm.
In new silicon chips, the laser is placed between a mirror and a curved grating. The grating is like a selective mirror, which only reflects light of a specific wavelength back into the laser, thus creating an optical cavity that allows the laser activity to target only specific wavelengths, thus providing the accuracy required in the communications field. .
Wei Yongqiang tested the new chip and found that it has excellent performance, emits 2.3 milliwatts of light, and emits only certain wavelengths of light.
Wei Yongqiang said: “From a practical point of view, we need to integrate a multi-source laser on a single chip, so integrating multiple lasers and gratings on one silicon chip will be the next challenge for us. We plan to use energy The same grating structure that handles a wider spectrum of wavelengths scales up to the latest single-wavelength lasers. The new equipment marks the fact that we will soon be able to commercialize communications equipment integrated on a single silicon chip."
The editor-in-chid silicon is cheaper and more expensive, and as a chip-integrated laser light source, it can also make it emit wavelengths that are particularly useful for communications. This is why people try every means to “knead†it with a laser. Unfortunately, the high optical loss of silicon materials will reduce the output and performance of laser sources, coupled with the complexity of the process, have all constrained silicon to become the ideal platform. Fortunately, researchers have now got an integrated silicon chip that can be operated and has a gain for grating light sources. Although the key technologies are still in the experimental stage, they can breathe a sigh of relief and continue to make great strides in the never-ending pursuit of communication - as large a volume, small attenuation, and low cost as possible.
Optical fibers need to pass laser beams of different wavelengths at the same time when transmitting data, but these different wavelengths of light waves are easy to crosstalk with each other, so it is necessary to precisely tune the laser so that it emits light of a specific wavelength to avoid such crosstalk. Using a raster can solve this problem.
Scientists used traditional methods to try to integrate a laser and a grating in a silicon chip, but none succeeded. Lasers are generally made up of several thin layers of semiconductor, while gratings are etched from silicon. All materials must be precisely aligned. The traditional method is to plant the laser and grating on a separate semiconductor chip. The whole process takes about 50 steps, and the surface roughness of the silicon crystal is required to be very low, less than 0.3 nm.
In new silicon chips, the laser is placed between a mirror and a curved grating. The grating is like a selective mirror, which only reflects light of a specific wavelength back into the laser, thus creating an optical cavity that allows the laser activity to target only specific wavelengths, thus providing the accuracy required in the communications field. .
Wei Yongqiang tested the new chip and found that it has excellent performance, emits 2.3 milliwatts of light, and emits only certain wavelengths of light.
Wei Yongqiang said: “From a practical point of view, we need to integrate a multi-source laser on a single chip, so integrating multiple lasers and gratings on one silicon chip will be the next challenge for us. We plan to use energy The same grating structure that handles a wider spectrum of wavelengths scales up to the latest single-wavelength lasers. The new equipment marks the fact that we will soon be able to commercialize communications equipment integrated on a single silicon chip."
The editor-in-chid silicon is cheaper and more expensive, and as a chip-integrated laser light source, it can also make it emit wavelengths that are particularly useful for communications. This is why people try every means to “knead†it with a laser. Unfortunately, the high optical loss of silicon materials will reduce the output and performance of laser sources, coupled with the complexity of the process, have all constrained silicon to become the ideal platform. Fortunately, researchers have now got an integrated silicon chip that can be operated and has a gain for grating light sources. Although the key technologies are still in the experimental stage, they can breathe a sigh of relief and continue to make great strides in the never-ending pursuit of communication - as large a volume, small attenuation, and low cost as possible.
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