Phase noise and polarization state insensitive optical coherent systems

Betti, S.; Curti, F.; Marchis, G. De; Iannone, E.

doi:10.1109/50.54484

Cited by 43 publications

(33 citation statements)

References 18 publications

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“…It is seen that although the power is optimally distributed in the wideband system, a much simpler FSK scheme yields a better performance. The parameter k is set to 8 as in [7]. The same observation holds true with double filter receivers as shown in Figure 3 where the value k = 7 is used.…”

Section: Discussionmentioning

confidence: 99%

“…These bandwidths B and W are taken to be sufficiently large to pass the phase noisy sinusoids unaltered. A heuristic relation introduced in [12] and used in [6,7] takes B = 1/T + k/ and W = kI, where k is chosen to be large enough, such as 8, to make the filters wideband according to the criterion mentioned above. This relation is motivated by the fact that the unmodulated carrier has a 3 dB bandwidth of i, and the modulation increases the bandwidth by an amount on the order of the bit rate.…”

Section: Discussionmentioning

confidence: 99%

“…The following fundamental observation is made in [7]. The reference signal r 2 (t) occupies a smaller bandwidth than the information signal ri(t), as it is unmodulated.…”

Section: Single Filter Receivermentioning

confidence: 99%

“…Since these signals will share a common channel provided by the optical fiber, a certain orthogonality must be provided so that the signals do not interfere with each other and can be extracted at the receiver for further signal processing. Two main methods have been suggested to achieve this orthogonality [6,7]. The first method assigns two different optical carrier frequencies vl and v 2 to the information and reference signals respectively.…”

Section: Transmitted Reference Systemsmentioning

confidence: 99%

“…Wider filters introduce more additive noise at their output. The tradeoff between the phase noise and additive noise must be accurately analyzed for transmitted reference systems [6,7,8]. Reference transmission has been previously studied only in the context of wideband filters [6,7], resulting in a suboptimal performance, as outlined in the next section.…”

Section: Transmitted Reference Systemsmentioning

confidence: 99%

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Reference transmission schemes for phase noise immunity

Azizoglu

Humblet

1995

IEEE Trans. Commun.

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We consider an optical communication system where a reference signal is transmitted along with a phase modulated information carrying signal. This system has the potential of alleviating the effect of phase noise considerably. We jointly optimize the bandwidth of the receiver and the powers of the two signals. The scheme achieves a performance that is close to that of ideal phase modulation systems when the ratio of bit rate to laser linewidth is large, and a performance that is identical to that of frequency modulation when the ratio is small. We also introduce a centered filter structure which achieves a far better performance than traditional filters due to increased the phase coherence.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…The following fundamental observation is made in [7]. The reference signal r 2 (t) occupies a smaller bandwidth than the information signal ri(t), as it is unmodulated.…”

Section: Single Filter Receivermentioning

confidence: 99%

Section: Transmitted Reference Systemsmentioning

confidence: 99%

Section: Transmitted Reference Systemsmentioning

confidence: 99%

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Reference transmission schemes for phase noise immunity

Azizoglu

Humblet

1995

IEEE Trans. Commun.

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Analog coherent optical space communication system using polarization ellipticity angle modulation

Kuri

Tsukamoto

Morinaga

1996

Electron. Comm. Jpn. Pt. I

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It is expected that analog coherent optical communication systems will become an important system for future space communications, in which an optical carrier is coherently modulated by frequency-multiplexed radio signals and optically transmitted. In this paper, the fundamental of the analog coherent optical space communication system are investigated, and a new analog optical communication scheme suitable for the space communication is proposed and analyzed. In the proposed analog scheme, the polarization ellipticity angle is selected as the modulation parameter, and the insensitiveness to the phase noise of the high-power laser and to the polarization axis mismatch are obtained as well as the high detection gain due to the use of a wideband M signal during the demodulation of the polarization ellipticity angle.

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