Fiber Optic Transceiver

When operating at a data rate of 3 Gbps, utilizing an HD-SDI (high-definition serial digital interface) fiber converter might lead to several video display challenges such as splash screens, black or blue screens, or frame lags. So, is there an effective solution to these issues? Absolutely, the 3G-SDI video SFP (small form-factor pluggable) transceiver is specifically designed to address these needs. This article will provide you with essential insights regarding the 3G-SDI video SFP and its prevalent applications.

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Understanding 3G-SDI

With the extensive availability of fiber optics, transmitting HD (high-definition) videos via fiber has become increasingly feasible. Common HD video interfaces include HDMI (high-definition multimedia interface), HD-SDI, and HD-CVI (high-definition composite video interface). But what defines 3G-SDI?

3G-SDI represents an advanced version of HD-SDI, providing nominal data rates of 1.485 Gbit/s (dual link) and 2.970 Gbit/s (serial link). The 3G-SDI system can accommodate digital video signals compliant with standards such as SMPTE424M, SMPTE292M, SMPTE259M, SMPTE297M, SMPTE305M, and SMPTE310M, in addition to supporting DVB-ASI (EN-9) formatted digital video signals. While 3G-SDI, like its predecessor HD-SDI, has predominantly been employed in television broadcasting, its application realm has expanded to include sophisticated global security solutions, such as high-end surveillance systems and unmanned operations, thereby enabling straightforward designs or upgrades with full HD cameras.

3G-SDI Video SFP & Related Products

A diverse range of 3G-SDI video products is currently available in the market. These devices encompass 3G-SDI extenders, distribution amplifiers, matrix switchers, and much more. They are compatible with 3G pathological signals and can also accommodate 1.5G pathological signals for long-distance transmission, catering to various user requirements.

However, it is crucial to note that while numerous 3G-SDI devices exist, many of them do not pass the SDI pathological-code tests. If video signals are sent at irregular bitrates, the previously mentioned issues can arise. This is particularly true during 3Gbps operation (i.e., p applications) versus 1.5G (720p or i applications). The underlying reasons can involve equipment quality or brand discrepancies, with cost considerations often playing a significant role. Many HD-SDI converters currently on the market utilize standard SFP optics, such as 1.25G or 2.5G digital SFPs, in place of the specific video SFP. Consequently, when transmission bit rates are not consistent, the error rate can escalate. Given that HD-SDI converter applications require superior quality frames, it is essential to employ dedicated 3G-SDI video SFPs to circumvent these complications and ensure the delivery of high-definition, smooth video frames.

3G-SDI modules are available in an SFP package compliant with the SFP Multi-Source Agreement (MSA) and SFF. These modules can feature various designs, such as single or dual transmitters, single or dual receivers, and duplex or bi-directional (BiDi) transceivers. Depending on the operational wavelengths, 3G-SDI modules are suitable for multimode or single-mode applications, operating at 850 nm to support transmission distances of up to 300 m over multimode fibers as well as at other wavelengths to facilitate distances up to 10 km or 80 km over single-mode fibers. Moreover, CWDM SFP modules for 3G-SDI are also accessible on the market, and these modules support DDM (digital diagnostic monitoring) functions, enabling monitoring of extensive output optical power, bias current, supply voltage, and operating temperatures, among other parameters.

3G-SDI Video SFP Application Scenarios

Similar to conventional SFP modules utilized in switches for signal transmission and reception, the 3G-SDI SFP module serves the same purpose but within HD-SDI equipment. This module plays a vital part in digital video extension applications over fiber. Below are three classic application scenarios for 3G-SDI SFPs (over SMF):

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Case 1: Deploying a 3G-SDI SFP transmitter to send signals and a 3G-SDI SFP receiver to receive signals over a simplex SMF. This represents the most fundamental form of HD-SDI video transmission.

Case 2: Utilizing 3G-SDI SFP transceivers capable of both sending and receiving signals through a duplex LC SMF.

Case 3: Implementing pairs of 3G-SDI BiDi SFP transceivers that can transmit and receive signals over a simplex LC SMF. This approach can result in cost savings regarding fiber utilization.

Conclusion

The 3G-SDI SFP transceiver serves as a cost-effective means for forwarding and receiving high-definition video signals. Our offerings include a comprehensive range of 3G-SDI SFPs covering wavelengths of 850 nm and beyond, including CWDM bands and BiDi solutions. Each module is thoroughly vetted for compatibility with prominent brands such as Cisco, Arista, Juniper, Dell, and Brocade.

Source: http://www.sfp-transceiver-modules.com/wiki/a/115/Applications-of-3G-SDI-Video-SFP