Chang Guang Hua Chip launches 56G PAM4 EML optical communication chip into the high-end optical chip market

Recently, Chang Guang Hua Chip released 56G PAM4 EML optical communication chip, entering the high-end optical chip market, opening a broad space for growth.

The data center is the carrier of computing power. AI servers have very high requirements on the transmission rate and delay of the underlying data. The corresponding top-shelf switch needs to match the larger data transmission bandwidth of the underlying data and the extremely low delay redundancy, which requires the matching of high-rate optical modules. The single-wave 100Gbps (56Gbaud four-level pulse amplitude modulation (PAM4)) electrical absorption modulator laser diode (EML) chip, which supports coarse wavelength division multiplexing (CWDM) at four wavelengths, achieves 400Gbps transmission rate using four chips, Or 8 chips to achieve 800Gbps transmission rate application target. The chip uses a ridge waveguide structure that supports four CWDM wavelengths -1271, 1291, 1311 and 1331nm, allowing optical signals of different wavelengths to be multiplexed in a single fiber, thus reducing the number of fibers required. The modulation rate is up to 56GBd, and the 56GBd PAM4 signal can be used to support 112Gb/s, which has the advantages of low threshold current and wide operating temperature range. The chip conforms to the RoHS standard and Telcordia GR-468 standard, and is the core component of the current 400G / 800G supercomputer data center interconnection optical module.

Since 2010, Changguang Huaxin has already laid out the production line of indium phosphide laser chips, with the initial batch shipment capacity of 2.5G FP. In 2020, the company carried out product research and development of 10G APD and L-band high-power EML, and fully established the research and development and production line of high-speed optical communication chips. The two products passed the certification of large factory (customer) in early 2022, and have realized the batch supply of products. The launch of the 56G PAM4 EML chip means that the company has fully realized horizontal expansion in the optical communication field.

Using IDM mode, Changguang Hua Core breaks through the key technologies and processes of epitaxial growth, chip manufacturing and sealing test, and has the largest 6-inch production line in the semiconductor laser industry. Three material systems of gallium arsenide (GaAs), indium phosphide (InP) and gallium nitride (GaN) have been constructed, with two chip structure technologies and process production platforms of side emission and surface emission. Since 2018, the company has laid out its layout in the field of high-speed optical communication chips, successively introduced senior experts in the industry, established a professional R&D team, and built a complete optical communication process platform and mass production line, including chip design, epitaxial growth, mesa etching, oxidation process, electric gold plating, performance testing, etc. It has overcome the problems of precise control and stability of material epitaxial growth and oxidation limit control of laser current, and is committed to the design, research and development, production and sales of high rate optical communication chips.

In the future, Changguang Huaxin will make full use of the advantages of IDM enterprises and its own strong technology accumulation, accurately grasp the market demand, continue to launch more and more competitive optical communication products, and realize the breakthrough of optical chip localization from 1 to N. Chinese laser core, brilliant life.

Source: Long Guanghua Core