Linewidth of SG-DBR laser and its effect on DPSK transmission

Shi, Kai; Smyth, Frank; Anandarajah, Prince M.; Reid, Douglas A.; Yu, Yonglin; Barry, Liam P.

doi:10.1016/j.optcom.2010.08.028

Cited by 9 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The relation depends on the specific CPR technique but tends to be linear. 7 1/f , or flicker noise has also been extensively studied, [22][23][24] where the penalty seems to increase exponentially with the amount of 1/f noise. For carrier induced frequency noise, however, no studies has been found on system performance.…”

Section: Impact On System Performancementioning

confidence: 99%

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

Olmedo¹,

Pang²,

Schatz

et al. 2015

Optical Metro Networks and Short-Haul Systems VII

View full text Add to dashboard Cite

We discuss about digital signal processing approaches that can enable coherent links based on semiconductor lasers. A state-of-the art analysis on different carrier-phase recovery (CPR) techniques is presented. We show that these techniques are based on the assumption of lorentzian linewidth, which does not hold for monolithically integrated semiconductor lasers. We investigate the impact of such lineshape on both 3 and 20 dB linewidth and experimentally conduct a systematic study for 56-GBaud DP-QPSK and 28-GBaud DP-16QAM systems using a decision directed phase look loop algorithm. We show how carrier induced frequency noise has no impact on linewidth but a significant impact on system performance; which rises the question on whether 3-dB linewidth should be used as performance estimator for semiconductor lasers.

show abstract

Section: Impact On System Performancementioning

confidence: 99%

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

Olmedo¹,

Pang²,

Schatz

et al. 2015

Optical Metro Networks and Short-Haul Systems VII

View full text Add to dashboard Cite

show abstract

“…This assumption holds relatively well for external cavity lasers (ECLs), which are often used in coherent transceivers as they can provide very narrow linewidths [6]. However, when considering monolithically integrated semiconductor lasers, the PSD of the frequency noise is no longer flat due to carrier induced frequency noise, and hence the relationship between linewidth and frequency noise is no longer trivial [7,8]. In this case, laser linewidth poorly indicates system performance degradation due to phase noise, disqualifying it as a suitable figure of merit to benchmark CPR algorithms.…”

Section: Introductionmentioning

confidence: 99%

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

et al. 2016

View full text Add to dashboard Cite

Abstract:We discuss the implications of using monolithically integrated semiconductor lasers in high capacity optical coherent links suitable for metro applications, where the integration capabilities of semiconductor lasers make them an attractive candidate to reduce transceiver cost. By investigating semiconductor laser frequency noise profiles we show that carrier induced frequency noise plays an important role in system performance. We point out that, when such lasers are employed, the commonly used laser linewidth fails to estimate system performance, and we propose an alternative figure of merit that we name "Effective Linewidth". We derive this figure of merit analytically, explore it by numerical simulations and experimentally validate our results by transmitting a 28 Gbaud DP-16QAM over an optical link. Our investigations cover the use of semiconductor lasers both in the transmitter side and as a local oscillator at the receiver. The obtained results show that our proposed "effective linewidth" is easy to measure and accounts for frequency noise more accurately, and hence the penalties associated to phase noise in the received signal.

show abstract

“…The refractive indices of these four sections can be independently adjusted by carrier injection. Depending on these four parameters and the laser chip temperature, mode cartography is performed for subsequent computer-based user access to a specific wavelength [10]. Unlike external cavity technology, the SG-DBR technology permits a fast wavelength switching time (<1 μs) [11].…”

Section: Introductionmentioning

confidence: 99%

Multigas detection using a sample-grating distributed Bragg reflector diode laser

et al. 2013

View full text Add to dashboard Cite

A sample-grating distributed Bragg reflector (SG-DBR) laser with 18 preprogrammed channels operating at 1540-1580 nm is characterized and compared for use as a source of tunable diode laser gas absorption spectroscopy. Two gases, CO and CO2, were targeted in this study by direct absorption spectroscopy and wavelength modulation spectroscopy with second-harmonic detection. In addition, the detectability of sample optical thickness is reported. Potential extensions of this research in the future are assessed using the SG-DBR diode laser as a source for tunable diode laser gas absorption spectroscopy.

show abstract

Linewidth of SG-DBR laser and its effect on DPSK transmission

Cited by 9 publications

References 22 publications

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

Digital signal processing approaches for semiconductor phase noise tolerant coherent transmission systems

Effective Linewidth of Semiconductor Lasers for Coherent Optical Data Links

Multigas detection using a sample-grating distributed Bragg reflector diode laser

Contact Info

Product

Resources

About