For those who are worried about cost reduction of equipment investment! Explained key points of long-distance transmission

It is said that we have entered the 400G era as the transmission speed has been upgraded due to the increase in traffic. At the JANOG51 Meeting held from January 25th to 27th, 2023, the Company booth saw a demonstration of 400G 80km transmission. On the other hand, the 1G-10G lineup continues to be in high demand, and the Company have received many requests to realize long-distance transmission with 10G.

At the seminar held on March 30, 2023, we verified and demonstrated 40km transmission using Coherent's 10G BiDi/10G ER optical transceiver module products, in order to provide useful information for such customers. explained.

In this article, as the event report, we will deliver part of the content that introduces the key points of long-distance transmission such as 40 to 80 km. At the end of the article, you can see the on-demand video of this seminar and the materials of the day, so please take a look.

agenda of the day

First, a review of JANOG51

JANOG51 was just hit by a cold wave of -10℃, and many people had a hard time getting to Fujiyoshida City. Many of the 2,196 people who attended the event stopped by the Company booth, and there were many occasions when we were able to meet people for the first time or after a long time with people who we hadn't been able to meet face to face. was seen

At the Company booth, we exhibited a dynamic demo of Coherent's high power version 400G-ZR. We loopbacked the signal using 80km of paired fiber and saw the error and ONSR state at that time. At the seminar, we reviewed the demo configuration in detail using block diagrams.

Investigate the actual situation of seminar participants!

Before the main part, this time, during the seminar, we asked three questions about your usage environment in real time.

① What is the transmission speed of the optical transceiver module that you usually use?

67% of the participants used 1-10G, which was the largest number, followed by 33% who used 25-100G.

② What is the required transmission distance in the usage environment of the optical transceiver module?

Here too, the majority of those who mainly use a few kilometers were 58%. This seminar was attended by people who are considering the realization of long-distance transmission in the future.

③ Have you installed third-party optics?

Regarding the introduction status of third-party optics, the result was that about half had already introduced them.

　

By listening to the precious voices of the real people, it was an opportunity for the participants to understand each other's situations. Thank you to everyone who responded to the questionnaire! (Q1,2 n=12, Q3 n=13)

Again, what are third-party optics?

It is said that GAFA originally started to introduce third-party optics, and it has been rapidly expanding in Japan for several years.

Conventionally, optical transceiver modules were procured from switch vendors, but now switches and optical transceiver modules are procured from separate vendors. This section explains in detail what the benefits are of switching from genuine products and why Macnica is promoting Coherent's optical transceiver modules.

Great verification of 10G long-distance products!

Of the 10G products, the 30km BiDi, the 40km ER, and the 80km ZR were examined and verified this time.

1. Can a 30km BiDi fly over 40km?

BiDi (Bi-Directional) products have half the number of optical fibers compared to normal optical transceiver modules. Therefore, it leads to the reduction of capital investment, and it is a product that we would like to consider for those who are worried about cost reduction.

First of all, we examined the data sheet and confirmed that the BiDi product is capable of 30km transmission at the nominal value. However, I thought that it might be possible to fly a little more, so I tried to verify whether 40km transmission was possible. In addition, we examined and explained in detail the Path Penalty that must be considered when adding an optical attenuator to what extent it can be tolerated.

2. If it is a 40km ER Duplex, what is the measured transmission value?

Next is a 40km product that uses an ER (Extended Range) product, and we were able to consider that it could fly 65km based on a desk verification based on the data sheet. Now, I introduced the results of verification by actually building a system using 40km fiber, 60km fiber, and 80km fiber.

3. 80km product ZR was verified on paper

The final verification was the ZR product.

You can view on-demand videos and materials with a simple registration.

In this article, we briefly introduced various verifications using the three types of 10G products introduced on the day. In the on-demand videos and materials, we not only explain the block diagram of the verification results of various patterns, but also carefully introduce the state of the GUI and the equipment used, so you can see the details.

At the end of the seminar, we will talk about Coherent's new product "100G ZR QSFP28 DCO", so if you missed it or if you are a participant and want to review it, please register using the form below. Please refer to

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