Incoherent all-optical code recognition with balanced detection

Andonović, Ivan; Tancevski, L.; Shabeer, M.; Bazgaloski, L.

doi:10.1109/50.296202

Cited by 16 publications

(6 citation statements)

References 13 publications

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“…The decoder output is then divided into two signals, both amplified by using EDFAs. The signal of the upper branch is sampled by the all-optical time gate (TG) in order to filter out the MAI [23,24]. Here, an optical delay line (ODL1) is used to set proper timing between the gating window generated by the TG and the incoming autocorrelation peak.…”

Section: Self Clocked Time Gate For Mai Elimination / Reductionmentioning

confidence: 99%

Towards self-clocked gated OCDMA receiver

Idris¹,

Osadola²,

Glesk³

2013

J. Eur. Opt. Soc.-Rapid Publ.

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A novel incoherent OCDMA receiver with incorporated all-optical clock recovery for self-synchronization of a time gate for the multi access interferences (MAI) suppression and minimizing the effect of data time jitter in incoherent OCDMA system was successfully developed and demonstrated. The solution was implemented and tested in a multiuser environment in an out of the laboratory OCDMA testbed with two-dimensional wavelength-hopping time-spreading coding scheme and OC-48 (2.5 Gbp/s) data rate. The self-clocked all-optical time gate uses SOA-based fibre ring laser optical clock, recovered all-optically from the received OCDMA traffic to control its switching window for cleaning the autocorrelation peak from the surrounding MAI. A wider eye opening was achieved when the all-optically recovered clock from received data was used for synchronization if compared to a static approach with the RF clock being generated by a RF synthesizer. Clean eye diagram was also achieved when recovered clock is used to drive time gating.

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Section: Self Clocked Time Gate For Mai Elimination / Reductionmentioning

confidence: 99%

Towards self-clocked gated OCDMA receiver

Idris¹,

Osadola²,

Glesk³

2013

J. Eur. Opt. Soc.-Rapid Publ.

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“…In OCDMA systems, the detection schemes affect the design of transmitters and receivers. In general, there are two basic detection techniques namely coherent [10] and incoherent [9]. Optical CDMA communication system can be alloptical or partly optical.…”

Section: A Detection Schemes Of Ocdmamentioning

confidence: 99%

New Receiver Architecture Based on Optical Parallel Interference Cancellation for the Optical CDMA

Elfadel¹,

Aziz²,

Idriss³

et al. 2008

JCM

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Optical Code Division Multiple Access (OCDMA) is considered as the strongest candidates for the future high speed optical networks due to the large bandwidth offered by the system, Based on the vast amount of bandwidth, OCDMA systems have received much attention in fiber optic Local Area Networks where the traffic is typically bursty. However, Multiple Access Interference (MAI), which is originated from other simultaneous users, severely limits the capacity of the system. Optical Parallel Interference Cancellation (OPIC) has been used to reduce the effect of MAI. However, the usage of OPIC in OCDMA systems will increase the demand for hardware complexity which results in higher processing time and cost. The hardware complexity increases in the receiver side of OPIC when the number of transmitter (users) increases. To overcome these difficulties, an efficient method is presented in this paper called, One Stage Optical Parallel Interference Cancellation (OS-OPIC) which is based mainly on the OPIC. Optical Orthogonal Code (OOC) is adopted as a signature sequence for the performance analysis and a new expression for the error probability is derived. It is shown that, the proposed method is effective to reduce the hardware complexity, processing time and cost while maintaining the same bit error probability at the cost of increasing threshold value.

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“…In this letter, we propose the use of a well-known detection technique to increase the SNR: the balanced detection. This detection procedure has resulted in remarkable improvements for several methods [5] in other areas of photonics, such as heterodyne detection [6], optical communications [7], [8] or biomedical applications [9]. We show that a balanced detection among the Stokes and anti-Stokes sidebands in a BOTDA can allow improving the results obtained over a conventional single-detector option.…”

mentioning

confidence: 92%

Signal-to-Noise Ratio Improvement in BOTDA Using Balanced Detection

Dominguez-Lopez

Lopez-Gil

Martín‐López

et al. 2014

IEEE Photon. Technol. Lett.

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Abstract-Brillouin optical time domain analysis (BOTDA) relies typically on the interaction among two counter-propagating waves: 1) a pulsed pump wave and 2) a modulated probe wave. The modulated probe wave has typically two sidebands, located at ±ν B with respect to the pump frequency. Conventional systems detect the time-resolved gain/loss by detecting only the upper/lower wavelength sideband. In this letter, we show that BOTDA can strongly benefit from the use of balanced detection among the two sidebands. In particular, the detected signal can be doubled while the noise only grows by a factor of (2) 1/2 , leading to a (2) 1/2 signal-to noise ratio (SNR) increase. Moreover, any common-mode noise in the probe signal path (e.g., master laser noise, modulator drifts, and so forth) is eliminated, rendering the system more robust. We validate the principle by experimental results that highlight the benefits of the technique in terms of the SNR.Index Terms-Brillouin scattering, distributed optic fiber sensor, balanced detection, temperature sensor.

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Incoherent all-optical code recognition with balanced detection

Cited by 16 publications

References 13 publications

Towards self-clocked gated OCDMA receiver

Towards self-clocked gated OCDMA receiver

New Receiver Architecture Based on Optical Parallel Interference Cancellation for the Optical CDMA

Signal-to-Noise Ratio Improvement in BOTDA Using Balanced Detection

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