40G Ethernet aggregation switches are becoming more and more common in modern data centers. In order to meet the needs of higher-density, high-speed data centers, 40G QSFP+ optical modules have emerged in this situation. The QSFP+ optical module enables interconnections between network devices (such as switches, routers, media converters, and similar devices) and fiber or copper cables at transmission rates up to 4×10 Gbps, Ethernet, Fibre Channel, InfiniBand, and synchronization Optical Network/Synchronous Digital Family (SONET/SDH) standard. What are the types of interfaces for 40G QSFP+ optical transceiver? Let’s learn together with OPTCORE!
40G QSFP+ transceiver optical interface
1, LC interface
The LC interface is used to connect to LC fiber connectors. The LC fiber connectors are made using the easy-to-use modular jack (RJ) latch mechanism, which has a smaller size. The size of pins and sleeves used is common SC. Half of the dimensions used for FC, FC, etc. are 1.25mm. Therefore, this interface can increase the density of fiber connectors in the system.
2, MPO/MTP interface
The MPO/MTP interface is connected to the MPO/MTP fiber optic connector. The MPO (Multi-fiber Pull Off) fiber optic connector is mechanically snapped into place. The optical and mechanical properties of the MTP fiber optic connector are based on the MPO connector. The MPO/MTP interface has better transmission performance, lower losses, and higher denier.
The LC interface is used to connect to LC fiber connectors. The LC fiber connectors are made using the easy-to-use modular jack (RJ) latch mechanism, which has a smaller size. The size of pins and sleeves used is common SC. Half of the dimensions used for FC, FC, etc. are 1.25mm. Therefore, this interface can increase the density of fiber connectors in the system.
2, MPO/MTP interface
The MPO/MTP interface is connected to the MPO/MTP fiber optic connector. The MPO (Multi-fiber Pull Off) fiber optic connector is mechanically snapped into place. The optical and mechanical properties of the MTP fiber optic connector are based on the MPO connector. The MPO/MTP interface has better transmission performance, lower losses, and higher denier.
40G QSFP+ Transceiver type
40GBASE-SR4 QSFP+
The 40G SR4 QSFP+ optical module conforms to the 802.ba D3.2 (40GBASE-SR4) standard and can connect MPO/MTP fiber connectors for 40G transmission applications. The transmission distance, when used with multimode OM3 fiber jumpers, is 100m. It can transmit up to 150m when used together OM4 fiber jumper. Its working principle is that when transmitting signals at the transmitting end, the electrical signals are first converted into optical signals by the laser array. When the signals are received at the receiving end, the photodetector array converts the parallel optical signals to Parallel electrical signals.
The 40G SR4 QSFP+ optical module conforms to the 802.ba D3.2 (40GBASE-SR4) standard and can connect MPO/MTP fiber connectors for 40G transmission applications. The transmission distance, when used with multimode OM3 fiber jumpers, is 100m. It can transmit up to 150m when used together OM4 fiber jumper. Its working principle is that when transmitting signals at the transmitting end, the electrical signals are first converted into optical signals by the laser array. When the signals are received at the receiving end, the photodetector array converts the parallel optical signals to Parallel electrical signals.
40GBASE-LR4 QSFP+
The 40G LR4 QSFP+ optical module is compliant with the 802.3ba (40GBASE-LR4) standard and is capable of connecting LC fiber connectors for use with single-mode fibers up to a transmission distance of up to 10 km. The interface of the 40G LR4 QSFP+ optical module is LC duplex. It has the advantages of high density, high speed, large capacity, low cost, and low power consumption. Its working principle is that the laser driver modulates the wavelength of the serial data, and the multiplexer will The modulated optical signals are combined for transmission. When they arrive at the receiving end, the transmitted signals are demultiplexed by the demultiplexer into four channels with a transmission rate of 10 Gbps. Then the PIN detector or transimpedance amplifier pairs the data stream. Restore
The 40G LR4 QSFP+ optical module is compliant with the 802.3ba (40GBASE-LR4) standard and is capable of connecting LC fiber connectors for use with single-mode fibers up to a transmission distance of up to 10 km. The interface of the 40G LR4 QSFP+ optical module is LC duplex. It has the advantages of high density, high speed, large capacity, low cost, and low power consumption. Its working principle is that the laser driver modulates the wavelength of the serial data, and the multiplexer will The modulated optical signals are combined for transmission. When they arrive at the receiving end, the transmitted signals are demultiplexed by the demultiplexer into four channels with a transmission rate of 10 Gbps. Then the PIN detector or transimpedance amplifier pairs the data stream. Restore
40GBASE-ER4 QSFP+
40GBASE-ER4 (“Extended Range”) is the port type of single-mode fiber defined in P802.3bm, using a 1300 nm laser. Its physical coding sublayer 64b/66b PCS is defined in IEEE 802.3 Article 82, and its physical medium related PMD is defined in Chapter 87. It uses four wavelengths, each transmitting serial data at a rate of 10.3125 Gbit/s. The 40GBASE-ER4 QSFP+ also use LC duplex interface.
40GBASE-ER4 (“Extended Range”) is the port type of single-mode fiber defined in P802.3bm, using a 1300 nm laser. Its physical coding sublayer 64b/66b PCS is defined in IEEE 802.3 Article 82, and its physical medium related PMD is defined in Chapter 87. It uses four wavelengths, each transmitting serial data at a rate of 10.3125 Gbit/s. The 40GBASE-ER4 QSFP+ also use LC duplex interface.
40GBASE-PSM4 QSFP+
PSM or Parallel Single Mode is a new type of interface that is mainly applicable to 40G and 100G optical transceivers. The 40GBASE-PSM4 QSFP+ transceivers include an MPO-12 or MPO-8 fiber interface. A QSFP + PSM4 module provides four full-duplex 10Gbps links over eight single mode fibers (SMFs) on a single cable. 40GBASE-PSM4 QSFP+ with the MPO/MTP interface. In this transceiver, Parallel Single Mode (PSM) is used. Its working principle is similar to that of the 40GBASE-SR4 QSFP+ optical module. The difference is that the 40GBASE-PSM optical module transmits parallel optical signals through 8 Single-mode optical fibers are transmitted in parallel.
PSM or Parallel Single Mode is a new type of interface that is mainly applicable to 40G and 100G optical transceivers. The 40GBASE-PSM4 QSFP+ transceivers include an MPO-12 or MPO-8 fiber interface. A QSFP + PSM4 module provides four full-duplex 10Gbps links over eight single mode fibers (SMFs) on a single cable. 40GBASE-PSM4 QSFP+ with the MPO/MTP interface. In this transceiver, Parallel Single Mode (PSM) is used. Its working principle is similar to that of the 40GBASE-SR4 QSFP+ optical module. The difference is that the 40GBASE-PSM optical module transmits parallel optical signals through 8 Single-mode optical fibers are transmitted in parallel.Different Application Scenarios for Interfaces of 40G QSFP+ Optical Modules
The 40GBASE-SR4 QSFP+ optical module is mainly used to implement the connection between network devices in the data center. It is suitable for short-distance transmission. It is commonly used in data centers to connect Ethernet switches with OM3/OM4 ribbon optical cables, 40GBASE-LR4 QSFP+ and 40G PSM QSFP+ optical module are suitable for long-distance transmission. The latter only requires two single-mode optical fibers for higher cost performance, while the former requires eight single-mode optical fibers, which has a higher port density and cost savings.
In the data center, high-performance computing network, enterprise core layer, and distribution layer application scenarios, 40G QSFP+ optical modules provide high-density and low-power 40G Ethernet connection transmission applications. Understand the above 40G QSFP + optical module interface, type, and application, when selecting 40G QSFP + optical module is very important, Optcore supply a variety of cost-effective, wide variety of 40G QSFP+ optical modules, but also provide reliable system solutions, help Users build a low-cost, cost-effective, easy-to-manage network system.
Original article from: https://www.optcore.net/
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