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WDM-PON Technology
Access networks are evolving to converge voice, data, video and wireless services onto a single platform. The need for high-bandwidth applications such as image and video services are rapidly emerging. For example, high definition TV (HDTV) requires a bandwidth of about 20 Mb/s/channel and will soon be a common video service in demand by consumers. To meet quality of service (QoS) requirements for these applications, a minimum guaranteed bandwidth per subscriber should be supported by the access network. Current networks based on copper cables, such as cable modem and many kinds of digital subscriber lines (DSL), were designed to support the use of non-dedicated bandwidth and do not provide either enough minimum bandwidth or transmission distance for future services.
A promising solution for providing quadruple-play service with high QoS is to bring a fiber directly to the home. By deploying a Passive Optical Network (PON) where multiple subscribers share a single optical feeder fiber, high bandwidth can be provided to the customer premises without the requirement for any active equipment in the field.
Wavelength Division Multiplexed PON (WDM-PON), whose architecture is shown in the figure below, can solve these problems by allocating a pair of dedicated wavelength to each subscriber. Each subscriber can communicate to the central office with a separate wavelength that can carry a different data rate and a different protocol. Historically WDM-PON has been expensive since it had to use expensive wavelength specific sources, e.g. DFB-lasers, in order to maintain pre-assigned wavelengths. In addition, it had high installation and maintenance costs.
A WDM-PON architecture providing multiple services.
Novera Optics has introduced a breakthrough technology to reduce the cost of a WDM-PON. Our proprietary technology enables the use of a common low-cost optical transmitter instead of high-cost wavelength specific lasers. By eliminating the wavelength dependence of the transmitter and receiver, we effectively have achieved a wavelength transparent architecture based on dense WDM-PON. Novera's WDM-PON supports plug and play and each ONT/ONU can be interchangeable. These innovations allow for considerable cost reductions in equipment, installation, maintenance, and inventory.
Advantages include:
- Wavelength independent ONT/ONUs
- High reliability due to only passive elements in the field
- High security and privacy
- Point-to-point dedicated connectivity
- Bit-rate independence
- Protocol transparency
- Graceful (or modular) upgrade
- Low equipment cost
- Low installation and maintenance costs
- Low inventory cost
- Bidirectional transmission to save feeder fiber
- A simple OSP fault monitoring
This transport platform can be identified with the letter S
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Simplicity of network architecture
- Easy setup
- Extensive supervision and training is obsolete
- Easy operation and maintenance
- Easy trouble shooting (makes remote trouble shooting on the PON from the central office possible with an WDM OTDR, no extra truck roll)
- Color-Free WDM-ONT enables a plug and play scenario (low inventory costs)
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Higest Security
- Through virtual point to point solution (λ to λ connection)
- Highest QoS
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Bit rate independency
- Provides future proof
- Delivery of any bit rate Megabits to Gigabits
- Long transmission length
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Any service any time
- Mixed Service capable
- Increase of revenue opportunity with the same infrastructure
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