Because the data center and cloud computing resource demands continue to grow, led to the development of very large scale public cloud data centers. Global data traffic continues to rise, prompting data centers to a higher speed, greater bandwidth from 100G, lower development delay, 400G next-generation backbone network will be upgraded and new direction, become an inevitable trend in the data center. Many service providers have started to deploy 400G network building programs. In the process of building a network system 400G, 400G optical modules play a vital role, then, what is 400G optical modules? And 10G, 25G, 40G optical module of the difference in where?
What is 400G optical modules?
400G 400G optical module called optical transceiver module, is primarily a photoelectric conversion, an electric signal converted at the transmitting end the electrical signals into optical signals, and then transmitted through the optical fiber to the receiving end and then converted into an optical signal. 400G 400G transmission rate of the optical module, in order to adapt to the online market by the 100M, 1G, 25G, 40G gradually to 100G, 400G, 1T is even born, in the construction of the network system 400G 400G optical modules play a vital effect.
400G optical modules and packages What?
Currently 400G module is not yet a unified standard, the standard package with 400G optical modules mainly in the following six.
①OSFP
OSFP English name is Octal Small Formfactor Pluggable, Octal representation 8. The criteria for the new interface standard, is not compatible with existing optoelectronic interface. Having a size of 100.4 22.58 13 is ^. 3 mm, the ratio of slightly oversized QSFP-DD, thus requiring a larger area of the PCB. Which is different from the electrical interface pin QSFP-DD, down each row.
② QSFP-DD
QSFP-DD的全称是Quad Small Form Factor Pluggable-Double Density， 该方案是对QSFP的拓展，将原先的4通道接口增加一行，变为8通道，也就是所谓的double density。该方案与QSFP方案兼容，这是该方案的主要优势之一。原先的QSFP28模块仍可以使用，只需再插入一个模块即可。
③ CFP8
CFP8是对CFP4的扩展，通道数增加为8通道，尺寸也相应增大，为401029.5 mm^3，该方案的是目前成本中最高的。
④CWDM8
该标准是对CWDM4标准的扩展，每个波长的速率为50G，也可以同样实现400G。 新增加了四个中心波长，即1351/1371/1391/1411nm。波长范围变得更宽，对Mux/DeMux的要求更高，激光器的数目也增加一倍。最大输入功率为8.5dBm。
⑤CDFP
CDFP标准诞生较早，至今已经发布第三版规范。CD表示400（罗马数字）。其采用16通道，单通道速率为25G。由于通道数较多，尺寸也比较大。
⑥COBO
COBO的全称是consortium for on board optics， 也就是将所有光学组件放置在PCB板上。该方案的主要优势是散热好，尺寸小。但是由于不是热插拔，一旦某个模块出现故障，检修比较麻烦。
在2018年的光通信展OFC上，QSFP-DD和OSFP在展会上均有厂商推出，两款解决方案优势最为突出，其最有可能作为下一代数据中心400G解决方案的标准，但是结合上述其他标准与封装形式，未来具体使用哪种解决方案还将取决于未来新一代云计算运营商的网络架构。
400G光模块有什么作用？
400G光模块的主要作用是能够提高数据的吞吐量，能最大限度的提高数据中心的带宽与端口密度。400G光模块未来的趋势是为了实现宽增益、低噪声、小型化和集成化等作用，为下一代无线网络与超大规模数据中心提供优质的光通信模块。
How many chips 400G optical modules?
Our 400G optical module chip serious dependence on imports. Light from the global chip industry competition, China's high-speed rate of the main features of high-end chip self-sufficiency rate of less light, the light-related demand for chips rely heavily on imports.
Thus, while the optical chips only need to use one, but the share of the cost is high in the 400G optical module, it is the jewel in the crown of the optical module industry value chain. In the optical module, the light end of the chip occupying the highest value, and the higher proportion of the cost of the high-chip light optical module. In the 10G / 25G optical module, the optical chip cost accounted for about 30%, 40G / 100G optical chip in a proportion of the cost of the optical module is about 50%, the proportion of the cost of the optical chip 400G optical module up to 70%.
400G optical modules and 10G, 25G, 40G optical module of the difference in where?
Despite 10G, 25G, 40G and even 100G optical module has become a mainstream market, but with the continuous improvement requirements for bandwidth, port density, and energy consumption of the system, 400G optical module will be able to further promote the technology to higher-speed system another new stage of progress.
Compared with 10G, 25G, 40G optical module, the optical module 400G arrival, the optical communication will enter a new era, n multiplexed optical communications from single carrier modulation coherent detection module to the low-side light polarization with a multi-carrier level phase modulation and coherent detection array transformation. Integrated photonic and electronic integration, ADC / DSP technology is the key module and an optical communication system 400G commercialization. With the urgent need for standardization of Ethernet, parallel light of the requirements of photonic integration technology will be a tremendous boost.
What 400G optical module market value?
As we all know, 100G product technology has matured, 400G is the current hot discussion, the industry is very concerned about the progress of 400G optical modules. Today 400G optical module design and mass production schedule is also more satisfactory in the current market backdrop, ultra-large-scale data center to the increasing demand for bandwidth, 400G optical communication module has become the best choice to improve system performance and reduce bandwidth costs , but with the advent of post-5G networks are going to be 400 light module market value of another positive catalysts.
400G optical module: https://www.gigalight.com/cn/400g-ethernet-optical-transceivers.html