Abstract
We demonstrate conversion from 64 × 10 Gbit/s optical time-division multiplexed (OTDM) data to dense wavelength division multiplexed (DWDM) data with 25 GHz spacing. The conversion is achieved by time-domain optical Fourier transformation (OFT) based on four-wave mixing (FWM) in a 3.6 mm long silicon nanowire. A total of 40 out of 64 tributaries of a 64 × 10 Gbit/s OTDM-DPSK data signal are simultaneously converted with a bit-error rate (BER) performance below the 2 × 10(-3) FEC limit. Using a 50 m long highly nonlinear fiber (HNLF) for higher FWM conversion efficiency, 43 tributaries of a 64 × 10 Gbit/s OTDM-OOK data signal are converted with error-free performance (BER<10(-9)).
Highlights
The rapid growth in Internet traffic is approaching the capacity limits of modern communication networks while being accompanied by increasing energy consumption
We demonstrate conversion from 64 × 10 Gbit/s optical timedivision multiplexed (OTDM) data to dense wavelength division multiplexed (DWDM) data with 25 GHz spacing
Two separate experimental demonstrations are carried out: 1) conversion of 640 Gbit/s OTDM encoded with differential phase-shift keying (DPSK) to 25 GHz DWDM using a silicon nanowire, and 2) conversion of 640 Gbit/s OTDM encoded with on-off keying (OOK) to 25 GHz DWDM using a standard highly nonlinear fiber (HNLF)
Summary
The rapid growth in Internet traffic is approaching the capacity limits of modern communication networks while being accompanied by increasing energy consumption. OSP appears better suited for much higher data rates where it can allow for large amounts of data to be processed simultaneously in a single device with an associated low switching energy per bit [6] Examples of this type of OSP are wavelength conversion [7] or regeneration [8]. Typical OTDM demultiplexers extract only a single tributary [3, 4], implying a highly complex and energy-consuming receiver structure in order to detect the full data content To overcome this challenge, many schemes have been proposed for demultiplexing all or several tributaries in a single optical device by serial-to-parallel conversion of the OTDM tributaries to wavelength division multiplexed (WDM) channels [9,10,11,12]. Received 9 Nov 2011; revised 30 Nov 2011; accepted 1 Dec 2011; published 6 Dec 2011 12 December 2011 / Vol 19, No 26 / OPTICS EXPRESS B827
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