The Coherent Optical Communication Is Suitable for High-speed and Long-haul Transmission
The coherent optical communication system is a more advanced and complex optical transmission system, which is suitable for longer-distance, larger-capacity information transmission, and the technical requirements are also very demanding. Since coherent optical communication systems have many advantages, so they are more and more popular.
The advantages of coherent optical communication
▶ The ability to select channels
▶ Excellent frequency adjustment and signal gain
▶ Flexible and adjustable channel
At the same time, coherent detection has the following significant advantages over direct detection.
Coherent detection — linear detection of the electric field, by beating with local oscillator (LO).
Direct detection is the conventional way to detect optical signal.
Quadratic detection of electric field.
1. High sensitivity and long relay distance
Enables coherent detection to improve receiver sensitivity
2. Excellent selectivity and large communication capacity , improving the selectivity of the receiver.
3. Multiple modulation methods
In traditional optical communication systems, only the intensity modulation method can be used to modulate the optics. Coherent optical communication is gradually moving from the laboratory to large-scale commercial use, and coherent optical modules based on high-speed digital signal processing technology DSP processing technology often encounter the problem of large power consumption.
In the research field of coherent optical communication, Gigalight independently developed 100G CFP-DCO coherent optical transceivers. DP-QPSK modulation technology using one of the current metropolitan area network and core network mainstream modulation technologies, meets full C-band ITU-T adjustable (50/100GHz), standard 100GE interface (customizable OTU4), conforms to CFP-MSA protocol. It is convenient for users to directly access existing equipment. It customized research and development for metropolitan area network applications and data center interconnection.
The transmission distance is up to 100 kilometers and supports P2P and DWDM transmission. In the application scenario below 100km, the low-power silicon optical device and driver, optimized DSP algorithm, the overall power consumption is lower than 24W, one-key selection to meet ITU-T G.692 100km and IEEE ( More than 10km) according to the link environment, fully embodying the characteristics of ease of use, flexibility, low power consumption and low latency, representing the future development direction of high-speed optical communication devices.
At the same time, Gigalight can provide customized system solutions according to customer application scenarios.
1.Link budget
2.Interface definition
3.Transmission requirements (rate, delay, protection)
4.System solutions are also available
In the next few years, Gigalight engineers will adopt new silicon photonics technology under the existing conditions to develop a lower power coherent optical communication transceiver for 200G or even 400G optical transmission network for the construction of a new generation of optical communication networks.
