Limitations in acousto-optic FM demodulators

Brooks, Paul; Reeve, Christopher D.

doi:10.1049/ip-opt:19951948

Cited by 4 publications

(4 citation statements)

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“…where Kg =7fwl and wd is the spot size of the focused beam given by wd =Jr.-F I 7fWi (14) and Wi is the spot size of the illuminating beam.…”

Section: Similar Analysis Assuming Gaussian Beam Illumination Givesmentioning

confidence: 99%

“…It can be used in wavelength division multiplexing (WDM) systems as a MUX/ DEMUX [9][10][11], in time division multiplexing (TDM) systems as a DEMUX [12], and in local area networks as a star coupler for broadcasting and routing [13]. It has been also shown that an AOD can be used as a demodulator for analog FM signals [14], and M-FSK signals [15].…”

Section: Introductionmentioning

confidence: 99%

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A novel digital PPM receiver using an acoustooptic deflector

Helaly

2009

2009 6th International Symposium on High Capacity Optical Networks and Enabling Technologies (HONET)

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A novel receiver for optical digital PPM signals using an acoustooptic deflector (AOD) is presented. The error performance of this receiver in the presence of AWGN is the same as that in conventional digital PPM receivers. However, the presented receiver saves the hardware complexity encountered in conventional receivers, especially for large number of time slots. In digital PPM, larger number of slots is required in order to reduce the power requirements. The presented receiver may require no slot recovery and block or frame recovery can be achieved at the expense of very small reduction in transmission efficiency. The AO PPM receiver also provides less interference from neighboring symbols, which results in improved error performance. The intersymbol interference can be reduced using pulse shaping or increasing the spatial separation between pulses. Commercially available AODs can demodulate digital PPM signals with number of slots M as large as one thousand. The geometry, design, and operation of an AO DPPM receiver is introduced, error performance is discussed, and interference analysis is presented. Computer simulation for an AO DPPM receiver with M=128 is presented and results are shown.

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“…where Kg =7fwl and wd is the spot size of the focused beam given by wd =Jr.-F I 7fWi (14) and Wi is the spot size of the illuminating beam.…”

Section: Similar Analysis Assuming Gaussian Beam Illumination Givesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A novel digital PPM receiver using an acoustooptic deflector

Helaly

2009

2009 6th International Symposium on High Capacity Optical Networks and Enabling Technologies (HONET)

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show abstract

“…Work has shown [3] 3) Change in laser wavelength causing a change in the deflection angle. Equation (1) shows that deflection is also proportional to illuminating wavelength A.Since a good laboratory Cw laser is stable to 1 part in 108 this is not considered to be a major problem.…”

Section: ) Change In Beam Position Due To a Change In Appliedmentioning

confidence: 99%

“…The ratio of signal power to background power can be written (2) In order to maximise system sensitivity we must minimise K. If a laser which has a truncated Gaussian intensity profile with a beamwidth of W measured at the e2 points illuminates an AO cell it can be shown that the relationship between frequency change Of and optical signal to background power ratio K, can be expressed [3] K = Wfôf The shot noise frequency sensitivity limit [3] can be written…”

Section: ) Change In Beam Position Due To a Change In Appliedmentioning

confidence: 99%