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Underwater Vehicle Annual: ROV, AUV, and UUVs

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Table 3

Multimode Legacy Laser Optimized Legacy Laser Optimized

Fiber Type (62.5/125µm) (50/125µm) (50/125µm) (50/125µm) Wavelength (OM1) (OM2) (OM3) (OM4)

Bandwidth 850nm 160 500 2,000 4,700 (MHz-km) 1300nm 500 500 600 600 is about the same (500-600 MHz-km) at 1300nm while it in- multiplexing. The undersea market commonly uses both creases signi? cantly at 850nm as you transition from OM1 WDM (2 wavelengths) and CWDM (16-18 wavelengths). to OM4 ? ber. The OM3 & OM4 ? bers are known as laser- This technology allows for the long distance transmission of optimized. As the table indicates, the wavelength range for many different types of signals over one, single-mode ? ber. which they are optimized is 850nm. Therefore, when you These include all types of video, GigE & 10GigE, data, audio, want to take advantage of the increased bandwidth of these etc. laser-optimized ? bers, it’s important to use lasers that emit in This ? rst article is intended to provide some of the basics of the 850nm range. ? ber and fundamental differences between multimode and sin-

Single-mode ? ber is really the only choice when transmit- gle-mode ? ber. Future articles will deal with CWDM (Coarse ting high bandwidth signals over long, undersea distances. In Division Wavelength Multiplexing), optical connectors and addition to the lower attenuation, single-mode ? ber has sig- active devices, test equipment and system performance test- ni? cantly higher bandwidth. This allows the ? ber to transmit ing. If you have any questions or if you have any particular high bandwidth signals over very long distances. Single-mode ? ber topic you would like to know more about, please send an ? ber can also be easily used for various types of wavelength email to me at .

Marine Technology Reporter 17

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