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100G Transceivers Guide

100G Transceivers Guide

100G QSFP28 transceivers are high-speed, compact optical transceivers designed for data centers, enterprise networks, and high-performance computing environments. These transceivers support data rates up to 100 Gigabits per second (Gbps) and are commonly used for high-density 100G Ethernet and InfiniBand applications.


Scalable 100G Solutions for Spine-Leaf Architectures

JTOPTICS® 100G transceivers are essential for high-speed, high-density data center connectivity. They enable fast and reliable data transmission between switches, servers, and storage systems in both spine-leaf and core-distribution network architectures. These modules support scalable bandwidth for cloud computing, virtualization, and AI workloads, making them ideal for modern enterprise and hyperscale data centers.
JTOPTICS 100G Optical Transceiver Module for High-Speed Data Center Connectivity
JTOPTICS 100G Optical Transceiver Module for High-Speed Data Center Connectivity
100G QSFP28 SR4 Transceiver
100G QSFP28 SR4 Transceiver
100GBASE-SR4 QSFP28 transceiver is a parallel 100G optical transceiver. It provides increased port density and total system cost savings. This 100G QSFP28 full-duplex optical transceiver offers 4 independent transmit and receive channels, each capable of 25 Gbps operation for an aggregate data rate of 100 Gbps on 100 meters over OM4 MMF. Generally, 100GBASE-SR4 QSFP28 transceiver converts parallel electrical input signals into parallel optical signals by a driven VCSEL array. The transmitter module accepts electrical input signals compatible with CML (common mode logic) levels.
100G QSFP28 PSM4 Transceiver
100G QSFP28 PSM4 Transceiver
100GBASE-PSM4 QSFP28 transceiver is a parallel 100G single-mode optical transceiver with an MTP/MPO fiber ribbon connector. It uses 8 fibers (4 transmit and 4 receive), each transmitting at 25 Gbps, resulting in an aggregate data rate of 100 Gbps on 500 meters over SMF. The working principle of 100GBASE-PSM4 QSFP28 transceiver is nearly the same with the 100G QSFP28 SR4 transceiver. The only difference is that PSM4 works over SMF, while SR4 works over OM4 MMF.
100GBASE-CWDM4 QSFP28 Transceiver
100GBASE-CWDM4 QSFP28 Transceiver
100GBASE-CWDM4 QSFP28 transceiver is a full duplex 100G QSFP28 optical transceiver that provides a high-speed link at aggregated data rate of 100 Gbps over 2 km on SMF. The transmitter path converts four lanes of serial electrical data to optical signal. The optical signals from the four lasers are optically multiplexed and coupled to single-mode fiber through an industry standard LC optical connector. The optical signals are engineered to meet the CWDM4 MSA specifications. On the receive side, the four incoming wavelengths are separated by an optical demultiplexer into four separated channels.
100G QSFP28 LR4 Transceiver
100G QSFP28 LR4 Transceiver
100GBASE-LR4 QSFP28 transceiver converts 4 input channels of 25 Gbps electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100G optical transmission. On the receiver side, the module demultiplexes a 100G optical input into 4 channels of LAN WDM optical signals and then converts them to 4 output channels of electrical data. The central wavelengths of the 4 LAN WDM channels are 1295.56, 1300.05, 1304.58 and 1309.14 nm as members of the LAN WDM wavelength grid defined in IEEE 802.3ba.

Frequently Asked Questions

They are the same. The “QSFP” form factor was originally defined for <10G speeds. When it was adopted for 40G, the name became QSFP+ to denote the higher aggregate performance. The same “QSFP” form factor was later adopted for 100G but the electrical interface had to be upgraded to handle 25Gbps/lane. The electrical interface for 100G can handle up to 28Gbps, hence the engineering and industry name is QSFP28. JTOPTICS refers to the 100G form factor as “100G QSFP” to avoid any confusion.

The JTOPTICS QSFP-100G-ZR4 supports link distances up to 80km. A minimum of 12dB attenuation is required to prevent permanent damage to the receiver - refer to the optics datasheet for optical specs. The QSFP-100G-ZR4 is supported on a limited set of platforms – refer to the Transceiver and Cable Guide for supported platforms. The QSFP-100G-LR4 supports links up to 10km over duplex single mode fiber. Enabling FEC with QSFP-100G- LR4 optics on JTOPTICS switches can allow for links beyond 10km with single mode fiber. 

Like the QSFP-100G-SWDM4 transceiver described above, the JTOPTICS QSFP-100G-SRBD transceiver also provides 100Gbs bandwidth over standard duplex multi-mode fiber. However, unlike the SWDM4 transceiver (which transmits 4 x 25Gbps wavelengths out of the Tx port, and receives 4 x 25Gbps wavelengths on the Rx port), each optical port on the SRBD contains both a transmitter and receiver, running at full duplex 50Gb/s over a single fiber. The two ports of the QSFP-100G-SRBD provide an aggregate 100Gb/s of bandwidth. The QSFP- 100G-SRBD is supported on all JTOPTICS QSFP 100G ports, and can be used for links up to 70m of OM3 or up to 100m of OM4 multi-mode fiber.

No. The 100G QSFP form factor has just 4 electrical lanes, which is not enough to support 10 lanes of 10G electrical interface. A 100G QSFP can only support a 4x10G or 4x25G electrical interface, which can be used as 4x10GbE or 4x25GbE, but not 10x 10GbE.. As a result the 100G QSFP SR4 cannot interoperate with SR10 based 100GbE transceivers. A complex design with a reverse gearbox (4x25G to 10x10G) can achieve this but results in expensive and power hungry optics.

Breakout mode refers to running a 100G port as 4 separate channels of 25GE. Transceivers or copper cables that enable optical or electrical breakout allow one 100G QSFP100 port to connect to four physically separate 25G links. When breaking out a single 100G port to 4x 25G links, care must be taken to use the same Forward Error Correction (FEC) mode on both ends of the link to ensure link-up. JTOPTICS transceivers and copper cables that support 100G to 4x25G breakout are listed below.

The 100G-DR/FR/LR transceivers can be plugged into any JTOPTICS 100G QSFP port. The electrical connector interface is 4 x 25G NRZ – the same as all existing ‘legacy’ 100G QSFP modules. The optical output is a single wavelength (or “lambda”) 100Gbit/s PAM-4 optical signal. The 100G-DR/FR/LR modules include a gearbox chip to convert the 4 x 25G NRZ electrical signals to a 1 x 100G PAM-4 optical signal. This is in contrast to legacy QSFP100 modules (such as a CWDM4 or LR4 100G module), which have 4 x 25G NRZ optical wavelengths multiplexed onto one fiber.

JTOPTICS® 100Gb/s transceiver module designed for optical communication applications compliant to 100G 4CWDM 10 MSA. The module converts 4 input channels of 25Gb/s electrical data to 4 channels of CWDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. ..
₹ 20,639.00
JTOPTICS® 100Gbps transceiver module designed for optical communication applications compliant to 100GBASE-ER4. The module converts 4 input channels of 25Gb/s electrical data to 4 channels of LAN WDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. Re..
₹ 218,291.00
JTOPTICS® 100Gb/s transceiver module designed for optical communication applications compliant to 100G 4WDM 10 MSA. The module converts 4 input channels of 25Gb/s electrical data to 4 channels of CWDM optical signals and then multiplexes them into a single channel for 100Gb/s optical transmission. R..
₹ 43,571.00
JTOPTICS® 100GBASE SR4 100m QSFP28 optical transceiver, 100G QSFP28 SR4 (JT 100G QSFP28 MPO SR4) is designed for use in 100 Gigabit Ethernet links up to 100m over Multi Mode Fiber (MMF). It is compliant with the QSFP28 MSA and IEEE 802.3bm 100GBASE SR4. It integrates 4 data lanes in each direction w..
₹ 10,811.00
This transceiver is a high-performance module for short-range duplex data communication and interconnect applications. It integrates four electrical data lanes in each direction into transmission over a single LC duplex fiber optic cable. Each electrical lane operates at 25.78125 Gbps and conforms t..
₹ 37,019.00
The Adtran 1445510F1C is a high-performance 100GBase-SR4 QSFP28 optical transceiver designed for efficient data transmission over multimode fiber (MMF). Operating at an 850nm wavelength, this transceiver module supports a reliable reach of up to 100 meters, making it ideal for short-range applicatio..
₹ 10,811.00
The Agema QSFP-100GA4BDR is a cutting-edge 100GBase-SR4 QSFP28 transceiver designed for high-speed data communication over short distances. Operating at a wavelength of 850 nm, this optical module supports data transmission over multimode fiber (MMF) up to 100 meters, making it ideal for data center..
₹ 10,811.00
The Alcatel 3HE11275AA is a high-performance 100GBase-SR4 QSFP28 transceiver engineered for short-range optical communication. Operating at a wavelength of 850 nm, this module supports data transmission over multimode fiber (MMF) for distances up to 100 meters, making it well-suited for data centers..
₹ 10,811.00
The Arista QSFP-100G-CWDM4 is a cutting-edge 100GBase-CWDM4 QSFP28 optical transceiver optimized for high-speed data transmission over single-mode fiber (SMF). Operating within a wavelength range of 1271 to 1331 nm, this module supports reliable communication over distances of up to 2 kilometers, ma..
₹ 20,639.00
The Arista QSFP-100G-ER4-AN is a cutting-edge 100GBase-ER4 QSFP28 optical transceiver designed for high-performance data transmission over single-mode fiber (SMF). Operating within the wavelength range of 1295-1309 nm, this module supports a remarkable reach of up to 40 kilometers, making it well-su..
₹ 218,291.00
The Arista QSFP-100G-LR4 is a high-performance 100GBase-LR4 QSFP28 optical transceiver, engineered for long-distance data transmission over single-mode fiber (SMF). Operating within the 1295-1309 nm wavelength range, this module supports a transmission distance of up to 10 kilometers, making it idea..
₹ 43,571.00
The Arista QSFP-100G-SR1.2-AR is a cutting-edge 100GBase-SR1.2 BiDi QSFP28 optical transceiver, optimized for high-speed data transmission over multimode fiber (MMF). This module operates at dual wavelengths of 850nm and 900nm, enabling a reliable reach of up to 100 meters, making it perfect for sho..
₹ 37,019.00
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