Abstract
We propose a new low complexity receiver for spectral amplitude optical
coded division multiple access (SAC OCDMA) that enables intensity noise reduction
using semiconductor optical amplifiers (SOAs). Compared to the standard receiver
requiring two optical filters at the receiver side, our receiver requires
only one optical filter. While a 1.4-dB power penalty in incurred, network
capacity is unchanged, i.e., BER floors due to intensity noise have the same
level. The primary motivation for the low complexity receiver is not reduced
component count, but rather modifying the receiver so that promising SOA noise
mitigation techniques might be employed to increase system capacity. SOA noise
cleaning suffers from a major limitation: filtering after the SOA can negate
most of the signal enhancement, the so-called post SOA filtering issue. The
only solution to date for the post-SOA filtering effect in SAC-OCDMA is prohibitively
complex McCoy , J. Lightw. Technol.,
vol. 25, no. 1, pp. 394–401, Jan. 2007, i.e., requiring multiple SOAs
per client. We demonstrate that our proposed receiver drastically limits the
client side filtering, thus maintaining noise suppression and overcoming the
post-SOA filtering effect. We compare BER at up to 10 Gb/s with and without
noise cleaning. When a noise cleaning module is used, BER improvement of several
orders-of-magnitude is observed when only a few users are active in the network.
Examination of the noise properties, however, leads us to conclude that highly
populated networks will have diminished improvement.
© 2009 IEEE
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