Abstract
We theoretically propose and demonstrate experimentally a Coherent Direct Sequence OCDMA en/decoder for multi-channel WDM operation based on a single device. It presents a broadband spectral envelope and a periodic spectral pattern that can be employed for en/decoding multiple sub-bands simultaneously. Multi-channel operation is verified experimentally by means of Multi-Band Super Structured Fiber Bragg Gratings with binary phase encoded chips fabricated with 1mm inter-chip separation that provides 4x100 GHz ITU sub-band separation at 1.25 Gbps. The WDM-OCDMA system verification was carried out employing simultaneous encoding of four adjacent sub-bands and two different OCDMA codes.
Highlights
In the last years, fiber to the home (FTTH) has been proposed as a solution for the last mile bottleneck in metropolitan networks for residential and business users
The group of Petropoulos [7] proposed a Wavelength Division Multiplexing (WDM)/Optical Code Division Multiple Access (OCDMA) system which employed one different en/decoding device based on standard SSFBGs for each channel. This approach can lead to complex and cumbersome systems, with the main inconvenience that all the SSFBGs have to be stabilized in temperature independently. Another DWDM-OCDMA system is proposed by simulations in [8], in this case a single device can encode three adjacent 100 GHz WDM channels; but as we will demonstrate, the proposed schema presents coding capacity losses
In this paper we propose and demonstrate a single device that provides a real WDMOCDMA system without coding capacity loss
Summary
Fiber to the home (FTTH) has been proposed as a solution for the last mile bottleneck in metropolitan networks for residential and business users. This approach can lead to complex and cumbersome systems, with the main inconvenience that all the SSFBGs have to be stabilized in temperature independently Another DWDM-OCDMA system is proposed by simulations in [8], in this case a single device can encode three adjacent 100 GHz WDM channels; but as we will demonstrate, the proposed schema presents coding capacity losses. In this paper we propose and demonstrate a single device that provides a real WDMOCDMA system without coding capacity loss This device is based on short time chips compared with its inter-chip time separation and can be employed for en/decoding of multiple sub-bands simultaneously exploiting the total capacity of the code. The final en/decoding device presents up to 4x100GHz sub-bands with an insertion loss penalty between 3 and 4 dB from centre to lateral bands
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