The R & D and production of optical communication networks and high-speed interface optical chips, optical devices and optical transceiver modules require high-performance sampling oscilloscopes for accurate measurement and verification. In order to ensure that the high-speed optoelectronic signal eye pattern can be accurately tested, the oscilloscope usually needs to have higher bandwidth, lower amplitude noise and lower inherent jitter. Based on the principle of isochronous sampling, the sampling oscilloscope does not need expensive and complex ultra-high sampling rate ADC, but can use ADC with higher conversion bits. Therefore, it overcomes the disadvantages of high cost and poor accuracy, and is more suitable for ultra-high speed optical / electrical interface testing. It has been widely recognized as a standard consistency testing instrument by various standards and specifications. For a long time, the sampling oscilloscope has been monopolized by foreign test instrument giant companies. As the global optical communication industry cluster with the largest demand, China has not had independent and controllable test products for decades.

Semight focuses on the independent R & D and production of domestic high-end optoelectronic testing instruments. After five years, it has gradually grown into a pioneer in China's optoelectronic testing field. In 2018, the 10GHz bandwidth sampling oscilloscope dca4201 was launched, which is a breakthrough of the domestic sampling oscilloscope from 0 to 1; In 2020, the company continued to launch the 30ghz broadband sampling oscilloscope dca6201, becoming the fourth sampling oscilloscope supplier in the world. Dca4201 and dca6201 have successively passed the verification of well-known enterprises at home and abroad, with accumulated sales reaching tens of millions of yuan.

In 2021, PAM4 eye map reconstruction and tdecq test algorithm were implemented on the hardware architecture of dca6201. In the spring of 2022, lianxun instrument officially announced the launch of the dca6201-pam option of the pam4 sampling oscilloscope supporting 53gbps (26.5625gbaud). The introduction of the above products not only breaks the monopoly of foreign countries for decades, but also solves the strategic "bottleneck" problem of the domestic high-speed communication industry.

In order to meet the demand of single wave 100G high-speed communication module test for further improvement of bandwidth, Semight has embarked on the development of 50GHz sample and hold amplifier chip from the mainstream chip with the courage and unswerving belief of breaking through the bridge and striving to break through the 50GHz sampling oscilloscope as soon as possible. Lianxun instrument will continue to make unremitting efforts to light up the light of domestic sampling oscilloscopes through the only way of independent chip streaming.

The existing sampling oscilloscope of Semight has the following characteristics and advantages:

Support a variety of different standard rate eye pattern tests: DCA4201 is used for 10G and below rate optoelectronic signal eye pattern and extinction ratio tests; DCA6201 is designed for NRZ / PAM4 eye pattern test at 25 ~ 28Gbaud rate, and fully supports tdecq test in accordance with the industry standard (ieee802.3bs / CD);

Integrated multi port integrated design: small shape (about 1 / 4 of the size compared with the traditional sampling oscilloscope), greatly saving space; Support 4 optical ports, meet the requirements of 100g qsfp module and 400G qsfp-dd SR8 / fr8 / DR8 multi port test, greatly improving the test efficiency;

• calibrated reference receiver: it complies with the industrial frequency response tolerance. Compared with the traditional industrial standard sampling oscilloscopes, the eye pattern is very consistent (as shown in the figure below, the eye pattern of the same measured signal is compared with that of the imported sampling oscilloscopes);

It has algorithms such as extinction ratio correction factor / dark current self calibration, so that its test results are very consistent with the industry standards and keep the consistency with the industry standard sampling oscilloscope test results. (as shown in the following table, comparison of test parameters of the same measured signal and imported sampling oscilloscope)

• low noise / high sensitivity: -10dBm@DCA4201 ； -8dBm@DCA6201 ；

• fast test speed: dca6201 can complete 1000 NRZ eye pattern waveform accumulation measurement within 7S;

• support single-mode / multimode: can test multimode and single-mode signals with wavelengths from 750nm to 1650nm;

• fast eye chart adjustment test mode: 1Hz refresh rate can significantly improve test throughput and reduce test cost.

• convenient and fast user interface: one click to complete all photoelectric eye diagram test parameters and eye diagram tests.