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PIC-based VICR ready for 100G optical networks

Posted: 19 Mar 2013 ?? ?Print Version ?Bookmark and Share

Keywords:NeoPhotonics? VICR? Optical Networks? OSNR?

Photonic integrated circuit provider (PIC) NeoPhotonics has recently rolled out a new 100G Variable Power Intradyne Coherent Receiver (VICR).

"We are pleased to add the VICR to our extensive line of PIC based intradyne coherent receivers," said Tim Jenks, Chairman and CEO of NeoPhotonics. "The VICR illustrates the power of photonic integration to provide additional functionality to our existing products, which are designed to benefit our customers with improved performance in the same form factor and simplified board layouts."

The PIC-based VICR integrates a variable optical attenuator (VOA) on the signal path and is designed to increase dynamic range and improve the optical signal to noise ratio (OSNR) for both single channel and multiple coincident signals. This capability is designed to enable service providers to better manage network capacity in colourless coherent networks.

In coherent optical communications systems, the colourless channel drop operation is enabled by using the local oscillator laser and the VICR to select the receive channel, eliminating the need for a terminal optical filter. The VICR then detects the signal channel to which the local oscillator laser is matched, but all other channels are outside the device bandwidth. In colourless applications the remaining channels are not filtered out optically, so the incoming signal power to the VICR can vary significantly depending on how many other channels are present, resulting in up to 100 times higher power falling on the receiver than in the single channel case. The NeoPhotonics VICR integrates a PIC variable optical attenuator that provides control and stability to the input signal. In both colourless and conventional optically filtered systems, the VOA also improves performance by allowing system selection of the optimal operating point to enhance OSNR and reduce the effects of optical impairments such as polarisation dependent loss (PDL).





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