High performance, 64-chip, 160 Gchip/s fiber grating based OCDMA receiver incorporating a nonlinear optical loop mirror

Reduction of interchannel interference noise in a two-channel grating-based OCDMA system using a nonlinear optical loop mirror

“…For a data rate of 1.25 Gb/s, error-free operation with a 3.6-dB power penalty reduction relative to simple matched filtering alone was obtained through the use of the NOLM. The residual power penalty of 1.6 dB is comparable to that achieved for single-channel operation without the NOLM [4]. We believe the penalty in the two-channel experiments to be due primarily to the contribution to the received average power made by imperfect suppression of the second ("orthogonal") channel.…”

“…Whilst good error free performance has been demonstrated, one can envisage incorporating additional nonlinear components within SSFBG-based processing schemes to either improve the performance or to extend the functionality of this technical approach. We recently achieved the first results in this direction by incorporating a fiber-based nonlinear optical loop mirror (NOLM) in a single-channel direct-sequence OCDMA receiver, achieving error-free, penalty-free operation [4]. In this letter, we report, for the first time, the use of a nonlinear optical switch to reduce the interchannel interference noise generated under multiuser operation of an SSFBG-based OCDMA system.…”

“…Superstructured fiber Bragg grating (SSFBG) technology represents an attractive means to produce compact, and potentially low-cost components for a wide range of pulse processing applications, including pulse pattern generation and recognition [3], [4]. Recently, we demonstrated the suitability of SSFBGs for generating, recognizing, and recoding 64-bit-long 160-Gchip/s phase-encoded optical pulse sequences [5].…”