Breakthroughs have been made in commercial development of economically tunable semiconductor lasers

I believe many people have had such an experience: pay 20 trillion network fees, but still looking at the karaoke network drama; work to half, the network is not to force, effort is in vain ... ... Such troubles in the near future or will Become history.

Recently, thousands of Zhejiang experts, Ningbo University of Nottingham doctoral tutor Zhang Ya-ping led the team in the economic adjustable laser commercial development made a breakthrough, to achieve the semiconductor adjustable laser chip commercial scale production capacity can be effectively resolved Network congestion problem, so that speed "fly".

Fiber has long been home, but the Internet or "turtle speed." why? "This is like a multi-lane highway is built, but the vehicle can only be in a queue on the order of the line driving." Zhang Ya-ping said, "At present, fiber-to-the-home access network optical network in the world are basically using time division multiplexing mode, In other words, multiple users share one wavelength, and each Internet user silently waits for the system to allocate their own time interval for accessing the Internet without knowing it, so often the network feels stuck.

The picture shows Professor Zhang Ya-ping in the laboratory research project Ningbo University of Nottingham for map

According to the planned development path of the access network by the International Telecommunication Union, with the tremendous demand of the global gigabit home network, the speed of optical network access network is expected to reach 1,000 gigabytes in 2020. The only way to fully solve the optical network bottleneck problem and achieve hundreds of times the growth of the access network speed is to introduce Wavelength Division Multiplexing (WDM) and even DWDM (DWDM) mode in the access network optical network , Most likely to introduce a large number of transmission wavelengths, similar to the car in parallel on multiple lanes.

Zhang Ya-ping said the key to achieving this goal is to fully adopt the wavelength tunable semiconductor laser in the upgraded new access network optical network. However, the technical performance and cost of adjustable lasers have been postponed and hindered this process. China has also been in a vacancy in the field of high-end optoelectronic chips and devices.

This year, however, with the support of the Zhejiang Thousands and the 325 Venture Capital Project in Hangzhou's Xihu District, Zhang Ya-ping finally made a breakthrough and developed a commercially available laser chip with adjustable output.

Do not look at this chip only 300 microns wide and 1.3 mm long, its advent of China to fill the gap in the field of commercial high-end optoelectronic chips, so that our country not only has a high-end optoelectronics "China core", but also in the development of similar technologies to achieve or even exceed International advanced level.

At present, the yield of commercial mass production chips has reached more than 85%, the chip continuous wave output power generally reached 70-120 milliwatts, the wavelength of a single chip can be continuously tunable range of 8.5-10 nm, the tuning speed is satisfied Second level, all the technical indicators basically reached the technical targets set forth in the state's key special projects earlier this year, with some of the indicators surpassing the highest levels of similar international products.

This tunable laser chip also has great military value. "It's like a radio station in a spy war game, by changing the wavelength or frequency to improve the security level, to achieve secure communications," Zhang Ya-ping explained. In addition, tunable lasers are also widely used for sensing, medical diagnostics and disease treatment.

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