Come see the many new products from MultiDyne Video and Fiber Systems at NAB 2009. Come see the latest innovations in the LiGHTBoX series of field portable fiber optic transport systems. Also come see the new HD-3500 HD SDI, audio and bidirectional data fiber optic transport system over one fiber. The innovative DVI-6000 DVI/RGB fiber optic transport system supports high-resolution graphics and video over a single fiber. The Fiber-Comm series extends 4 wire intercom over a single fiber.

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2009 NAB New Products from MultiDyne

Download the full PDF version of the presentation below:

http://www.multidyne.com/LiteratureList.cfm?CategoryID=1

Video of the MultiDyne Booth at NAB 2009:

MultiDyne NAB 2009 Booth: DVI, RGB. VGA Fiber Optic Link; LiGHTBoX HD-SDI Fiber Link

MultiDyne NAB 2009 Booth: DVI, RGB. VGA Fiber Optic Link; LiGHTBoX HD-SDI Fiber Link

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Booth SU6917

• Economical solution for fiber optic transport of multi-rate HD-SDI signals ranging from 5Mb/sec to 3.0Gb/sec plus 2 AES or 4 audio, bi-directional data, & 2 return audio over a single fiber.
• Two models; one supports SMPTE 424M 3G HD-SDI standard or
• One supports SMPTE 292M 1.485G HD-SDI standard
• Also supports embedded audio & data.
• Looping inputs, Dual re-clocked & EQ outputs
• Convenient modules for field applications or frame mount.
• Battery operation, field applicable.

• 1.5Gb/sec digital video, 4 audio, or 2 AES & bi-directional data
• 3.0 Gb/sec digital video, 4 audio, or 2 AES & bi-directional video
• Multirate video from 5Mb/sec up to either 1.5 Gb, or 3.0 Gb depending on card
• Equalized and reclocked video at SMPTE standards
• 2RU frame, 10 cards or 20 cards
• Independent rear modules for connectivity

• Uncompressed DVI Single & Dual Link over ONE fiber
• Supports up to WQXGA 2560 x 1600
• Supports Stereo Audio and Data
• Fully un-compressed, 100% transparent, No Frame Dropping
• The system provides a pixel-for-pixel image transport
• 100% 24 Bits for all scan rates with no contouring or bit reduction at high scan rate
• Shipping NOW!

• Frame sizes of 16, 32, 64, 144, and 288
• 16 I/O’s per switch card
• CWDM coarse wave division multiplexing optics supported
• Signal independence, DVI, 3GB, RGB
• Control via Ethernet, intuitive GUI
• External serial port. (Crestron, AMX)
• Pathological testing compliance

• HD-SDI repeater / optical transport, HD-SDI fan out DA with HDMI & Audio monitoring.
• Available in 3Gb, or 1.5Gb versions for a cost effective solution.
• Optical input and reclocked optical output.
• Compatible with other SMPTE compliant devices including MultiDyne’s HD-1500, and HD-3000.
• Three copper HD-SDI outputs.
• HDMI output for cost effective local monitoring
• Audio de-embedding from HD-SDI stream for output on HDMI, or on separate RCA connectors.

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Vegas broadcaster upgrades Stratosphere fiber link

by Craig Johnston

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NHL HD Goal Camera fed to MultiDyne HD-1500 HD-SDI Fiber Optic Link

MultiDyne Video & Fiber Optic Systems announced today that the MultiDyne HD-1500 was selected by Applied Electronics Ltd (AEL) and The National Hockey League (NHL) for the High Definition Goal Video Replay System.  The system was designed and installed by AEL.  Frank Jachetta of MultiDyne worked closely with Eugene McEleney of AEL and Jim Wilkes of the NHL.

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Optical Losses

Optical loss or attenuation can vary from 300 to 0.2 dBm/km for plastic or single-mode fibers, respectively. Optical fiber has different loss characteristics at different wavelengths. The optical windows, as mentioned earlier, are regions within the optical fiber spectrum with low loss.

The earliest fiber-optic systems operated in the first optical window in the 850 nm range. The second window is the 1310 nm range, which has zero dispersion. The third window is the 1550 nm window. A multimode fiber has an attenuation of about 4 dB/km at 850nm and about 2.5 dB/km at 1310 nm. The multimode fiber spectrum attenuation curve is shown in Figure 6.10-3. Note the high loss regions at 700, 1250, and 1380 nm. The single-mode fiber attenuation curve is shown in Figure 6.10-11. There are high-loss regions at 800, 1100, and 1490 nm regions. The high-loss region at about 1100 nm is called the mode transition region. This is where the fiber changes from multimode to singlemode characteristics.

In order to make use of the low-loss properties of a given region in the fiber, the optic light source must generate light at that wavelength. For multimode fiber, light sources are used in the 850 and 1310 nm wavelengths. In single-mode fiber, light sources are typically at 1310 and 1550 nm. CWDM lasers are in the 1470–1610 nm range. The curve in Figure 6.10-11 shows that the fiber has low loss and a flat spectrum at these wavelengths. Corning introduced a CWDM metro fiber that eliminated the high water peak or the high-loss region centered at about 1380 nm. Most single-mode fibers, on new installation, use this flatspectrum fiber with a usable spectrum from about 1270–1610 nm. The new fiber gives the ability to have up to 18 CWDM wavelengths on one single-mode fiber.

Most video fiber-optic systems take advantage of the 18 usable wavelengths. CWDM is far less expensive than its 42 wavelength counterpart, DWDM. With the fiber-optic systems available with up to 8 channels of video per wavelength, when combined with the capabilities of CWDM optical multiplexing, more than 144 channels of video can be transported over one fiber.

Plastic fiber is used over short distances due to high attenuation. The visible light region at around 650 nm is used over plastic fiber. Optical attenuation is constant at all bit rates and modulation frequencies. The attenuation in copper cable increases at higher bit rates and modulation frequencies. In a copper cable, a 100 MHz signal will be attenuated more per foot than a 50 MHz signal. This results in distances and bandwidth limitation. In a fiber cable, the 100 Mhz and 50 MHz signals are attenuated the same.

Figure 6-10-11 Singlemode Fiber Attenuation Curve

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The Future of Video Fiber Optic Transport

Systems are currently in development for the transport of high resolution video at bit rates exceeding 10 Gbps.  Digital cinema and the proliferation of high definition television will demand fiber optic transport systems with high bandwidth capabilities.  Fiber transport to the home of video, telephone and internet traffic is slowly becoming a reality in many North American communities.  This will fuel the demand for high speed content delivery and distribution throughout the globe.

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Bandwidth

The optical losses and usable bandwidth of a fiberoptic system have to be taken into account. As mentioned
previously, multimode fibers have greater losses and less bandwidth compared to single mode.
Single mode has lower losses and very high bandwidth than does multimode.

Most manufacturers of multimode fiber-optic cable do not specify dispersion. They will provide a figure
of merit known as the bandwidth-length product or just bandwidth with units of MHz-kilometer. For
example, 500 MHz-km translates to a 500 MHz signal that can be transported 1 km. The product of the
required bandwidth and transmission distance cannot exceed 500:

BW × L ≤ 500

A lower bandwidth signal can be sent a longer distance.
A 100 MHz signal can be sent

L = BW – product/BW
= 500 MHz-km/100 MHz
= 5 km

Single-mode fiber typically has a dispersion specification provided by the manufacturer. The dispersion
is specified in picoseconds per kilometer per nanometer of light source spectral width or ps/km/nm. This
loosely translates to the wider the spectral bandwidth of the laser light source, the more dispersion. The analysis of dispersion of a single-mode fiber is very complex. An approximate calculation can be made with
the following formula:

BW = 0.187/(disp × SW × L),

where:

disp is the dispersion of the fiber at the operating wavelength with units seconds per nanometer per
kilometer.

SW is the spectral width (rms) of the light source in
nanometers.

L is the length of fiber cable in kilometers.

For example, with a dispersion equal to 4 ps/nm/km, spectral width of 3 nm, and a transmission length
of 20 km, then:

BW = 0.187/(4 × 10–12 s/nm/km) × (3 nm) × (20 km)
BW = 779,166,667 Hz or about 800 MHz.

If the spectral width of the laser light source is doubled to 6 nm the bandwidth will drop to about 390
MHz. This shows how significant the spectral width of the laser source is on the usable bandwidth of a fiber.
If a laser light source with a narrow optical spectral width is used, or a fiber with a lower dispersion figure,
the bandwidth and transmission distance will increase.

In single-mode fiber communications, there are two basic types of laser light sources. The first type is the
less expensive laser that uses Fabre-Perot laser diode (FP-LD) technology. The FP-LD is an inexpensive
choice for digital fiber-optic communication. With a spectral width of typically 4 nm or more, it is primarily
used for lower bandwidth or short-distance applications. The second is the distributed feedback
laser diode (DFB-LD) technology. These light sources are more expensive and are widely used for longdistance fiber-optic communications. The typical spectral width for a DFB laser is about 1 nm. When a DBF laser is used in combination with a low dispersion fiber, the transmission bandwidth and distance can be significantly higher.

Table 6-10-2 Typical Optical Fiber Loss

Table 6-10-4 Typical Fiber Optic Bandwidth

See Table 6.10-2, which shows the typical fiber-optic cable losses, and Table 6.10-4, which shows the bandwidth for different types of fiber cable.

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