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There are two new QSFP28 optical transceiver products appeared in the optical module market: 100G QSFP28 4WDM 40km optical transceiver and 100G QSFP28 ER4 Lite optical transceiver. However, many people donâ€™t know too much about the 100G QSFP28 4WDM 40km optical transceiver and 100G QSFP28 ER4 Lite optical transceiver. Here we are going to have a brief introduction about the two products to help you have a better understanding and make the right choice when purchasing them. \n\n
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There are two new QSFP28 optical transceiver products appeared in the optical module market:
100G QSFP28 4WDM 40km optical transceiver and 100G QSFP28 ER4 Lite optical transceiver.
However, many people don’t know too much about the 100G QSFP28 4WDM 40km optical
transceiver and 100G QSFP28 ER4 Lite optical transceiver. Here we are going to have a brief
introduction about the two products to help you have a better understanding and make the right
choice when purchasing them.
Introduction on 100G QSFP28 4WDM:
4WDM MSA (http://4wdm-msa.org/) defines our familiar CWDM4 and 4WDM products with
different distances and wavelengths (2km/10km/20km/40km). It’s shown as follows.
2km and 10km use CWDM wavelength; 20km and 40km use LAN WDM wavelength.
Because of the difference in the size of the CWDM and LAN WDM wavelengths, the
wavelength-transmitting TOSA for LAN WDM must be carried with a TEC (Thermo Electric Cooler).
As the stable wavelength drifts with temperature, TEC consumes an extra 0.5W of power, so the
overall power consumption of optical transceivers with LAN WDM wavelengths will be higher
than that of CWDM optical transceivers.
The BER requirement of module product defined by 4WDM MSA is better than 5E-5, because the
system or switching equipment has the FEC front-end error correction function to meet the
overall link bit error rate requirements. FEC has pros and cons, it increases packet delay and
overall power consumption of the device while enabling. For example, when multiple devices in
the network architecture enable FEC, the delay of FEC is cumulative, which is fatal for a dedicated
network requiring high real-time performance, like financial trading system and so on.
Introduction on 100G QSFP28 ER4 Lite:
IEEE 802.3ba defines that the 100GBASE-LR4 / 100GBASE-ER4 series has a BER requirement of
better than 1E-12 w / o FEC for optical modules. Since the receiving sensitivity of 100GBASE-ER4
is not satisfied with the existing APD technology, the SOA size is too large for the QSFP28 series;
many optical module companies in the industry defined a non-standard 100GBASE-ER4 Lite with
QSFP28 package that the largest transmission distance is up to 30km without FEC.
The receiving sensitivity of 100GBASE-ER4 Lite 30km has no clear definition in IEEE802.3ba. At
the current level of 100G APD ROSA, the average of OMA Sensitivity is around -17dbm (BER
1Efirstname.lastname@example.orgGbps). The description of the100GBASE-ER4 Lite products in the industry is
defined as 30km w/o FEC, 40km with FEC. During product development, I deliberately tested
40km OTU 27.95Gbps 70-degree long-distance running error in a laboratory environment. It
meets the 1E-12 BER w / o FEC. The receiver sensitivity data cannot meet the requirements of
protocol 100GBASE-ER4. The running fiber can meet the 40km application.
The 100G QSFP28 ER4 Lite supports dual rate 100GE and OTU4 applications, while the 100G
QSFP28 4WDM 40km only supports 100GE applications.
With the development of device packaging technology, there is a plan to develop a small SOA +
PIN integrated ROSA in the industry. When the technology is mature, the QSFP28 products
meeting the 100GBASE-ER4 standard will also be released. And now Gigalight has released the
latest 100G QSFP28 4WDM 40KM optical transceiver and 100G QSFP28 ER4 Lite 40KM optical
transceiver. For more product details, you can directly visit its official website.