40Gbit/s coherent optical receiver using a Costas loop

Park, Hyun-Chul; Lu, Mingzhi; Bloch, Eli; Reed, T. B.; Griffith, Z.; Johansson, Leif; Coldren, L.A.; Rodwell, M.J.W.

doi:10.1364/oe.20.00b197

Cited by 40 publications

(16 citation statements)

References 13 publications

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“…The main challenge is how to effectively establish a reliable phase reference between Alice and Bob. While various techniques, such as feedforward carrier recovery [22], optical phase-locked loops [23], and optical injection phase-locked loops [24], have been developed in classical coherent communication, these techniques are not suitable in QKD where the quantum signal is extremely weak and the tolerable phase noise is low. Furthermore, to prevent Eve from manipulating the LO, the LO laser should be isolated from outside both optically and electrically.…”

Section: Introductionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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Continuous-variable quantum key distribution (CV-QKD) protocols based on coherent detection have been studied extensively in both theory and experiment. In all the existing implementations of CV-QKD, both the quantum signal and the local oscillator (LO) are generated from the same laser and propagate through the insecure quantum channel. This arrangement may open security loopholes and limit the potential applications of CV-QKD. In this paper, we propose and demonstrate a pilot-aided feedforward data recovery scheme that enables reliable coherent detection using a "locally" generated LO. Using two independent commercial laser sources and a spool of 25-km optical fiber, we construct a coherent communication system. The variance of the phase noise introduced by the proposed scheme is measured to be 0.04 (rad 2 ), which is small enough to enable secure key distribution. This technology also opens the door for other quantum communication protocols, such as the recently proposed measurement-device-independent CV-QKD, where independent light sources are employed by different users.

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Section: Introductionmentioning

confidence: 99%

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

et al. 2015

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“…The first source is the phase noise of both the transmitting laser and the LO laser, while the second source is the shot noise of the loop [13][14][15]. The total power spectral density (PSD) of shot noise can be written as follows [2,13]:…”

Section: Phase Error Of Loop Without Loop Delaymentioning

confidence: 99%

“…The performance of OPLLs that utilize coherent receivers has been comprehensively discussed [10][11][12][13][14][15]. All of those studies are based on the phase noise of the OPLL, which comes from two sources: phase noise of the signal and LO lasers and loop shot noise.…”

Section: Introductionmentioning

confidence: 99%

“…The space-optical hybrid is a key device in the OPLL, since it gives a fixed phase-difference output between each branch. In the previous studies, the optical hybrid was considered to be an ideal device with an accurate phase shift [10][11][12][13][14][15]. However, the optical hybrid contains many phase-and polarization-sensitive components.…”

Section: Introductionmentioning

confidence: 99%

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Influences of hybrid phase-shift error on the performance of optical coherent receivers

Zhang

Qin

Huang

et al. 2015

Optics Communications

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“…The first highly integrated homodyne BPSK optical coherent receiver was proposed, and a part of the measurement results were demonstrated in our recent publications [11], [22]- [25]. In this paper, more detailed and comprehensive system design, analysis, implementation, device fabrication, and measurement results are described systematically.…”

Section: Introductionmentioning

confidence: 99%

An Integrated 40 Gbit/s Optical Costas Receiver

Park

Bloch

et al. 2013

J. Lightwave Technol.

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In this paper, a highly-integrated widely-tunable optical homodyne receiver is reported with 40 Gbaud/s data rate. By using photonic and electronic integration, the receiver is realized within a size of 10 10 , and the system is very robust and resistive to environmental changes. An integrated photonic coherent receiver circuit is demonstrated with 35 GHz photodetector bandwidth, and the integrated local oscillator (LO) laser covers a 40 nm range. The electronic IC (EIC) has a working frequency up to 50 GHz. The feedback loop is carefully analyzed and designed, and the experimental results show loop bandwidth, which matches the design. The hold-in range is measured to be . The phase noise of the transmitting laser has been cloned to the LO laser quite well, and both the linewidth measurement and phase noise measurement show no observable cross talk between binary phase shift keying (BPSK) data and the optical phase-locked loop (OPLL). Error free ( ) is achieved up to 35 Gbit/s. The system consumes 3 Watts of power.

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40Gbit/s coherent optical receiver using a Costas loop

Cited by 40 publications

References 13 publications

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Generating the Local Oscillator “Locally” in Continuous-Variable Quantum Key Distribution Based on Coherent Detection

Influences of hybrid phase-shift error on the performance of optical coherent receivers

An Integrated 40 Gbit/s Optical Costas Receiver

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