Novel Frequency Chirp Compensation Scheme for Directly Modulated SG DBR Tunable Lasers

Maher, Robert; Shi, Kai; Anandarajah, Prince M.; Kaszubowska, A.; Barry, Liam P.; Yu, Yonglin

doi:10.1109/lpt.2008.2011650

Cited by 12 publications

(6 citation statements)

References 7 publications

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“…A novel frequency chirp compensation scheme for directly modulated SG-DBR tunable lasers was proposed and demonstrated with experiments in our previous work [17]. By using the compensation technique, the frequency chirp was significantly reduced.…”

Section: Chirp Compensation Scheme and Performance Improvementsmentioning

confidence: 94%

“…The ONUs are equipped with tunable transmitters and receivers, where 10 nm tuning range 3s-DBR lasers with 2.5 Gb/s direct modulation are used so that any of the four upstream wavelengths can be reached. To overcome the signal distortions resulting from the frequency chirp due to direct modulation, we extend on our novel idea of the frequency chirp compensation technology with inherent characteristics of DBR type tunable lasers [17]. For achieving the optimum compensation, the chirp characteristics of 3s-DBR lasers induced by direct modulation are investigated with extensive numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

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Chirp-Compensated DBR Lasers for TWDM-PON Applications

Zhao

et al. 2015

IEEE Photonics J.

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We propose a novel chirp compensation scheme for directly modulated threesection distributed Bragg reflector (3s-DBR) lasers in applications of the time-and wavelength-division multiplexed passive optical network systems. The frequency chirp of 3s-DBR lasers induced by direct modulation is investigated through extensive numerical simulations based on the time-domain travel-wave model. To overcome the signal distortions resulting from the frequency chirp due to direct modulation, we extend on our novel idea of frequency chirp compensation technology with inherent characteristics of DBR-type tunable lasers. Q factors and extinction ratio for different system transmission lengths are analyzed and compared. Large dispersion tolerance of the system is achieved by using the chirp compensation scheme.

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Section: Chirp Compensation Scheme and Performance Improvementsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Chirp-Compensated DBR Lasers for TWDM-PON Applications

Zhao

et al. 2015

IEEE Photonics J.

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“…The main drawbacks here are the limited laser bandwidth and the frequency chirp. The first one restricts the maximum modulation data rate, while the second leads to a broadening of the optical spectrum, which in conjunction with fiber dispersion, limits the transmission distance [33].…”

Section: Dynamic Characterizationmentioning

confidence: 99%

Characterization and Direct Modulation of a Multi-Section PIC Suited for Short Reach Optical Communication Systems

Hammad

Kaszubowska-Anandarajah

Pascual

et al. 2020

Photonics

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A multi-section active photonic integrated circuit (PIC) is characterized in detail to gauge its suitability as a transmitter for short reach applications. The PIC is 1.5 mm long and consists of two lasers integrated in a master-slave configuration, which enables optical injection locking (OIL) of the slave laser. The beneficial impact of the injection is characterized by static and dynamic measurements. The results show a reduction of the optical linewidth from 8 MHz to 2 MHz, a relative intensity noise (RIN) value as low as −154.3 dB/Hz and a 45% improvement of the slave laser modulation bandwidth from 9.5 GHz to 14 GHz. This frequency response enhancement allows the direct modulation of the slave gain section at a data rate of 10.7 Gb/s and an error-free transmission over 25 km of standard single-mode fiber (SSMF). Transmission performance of the injected case shows a 2 dB improvement in the minimum optical power required to achieve a bit error rate of 3.8×10−3 (hard decision forward error correction limit). These results demonstrate that the multi-section PIC can serve as an attractive cost-efficient transmitter in a wide variety of low-cost short-reach data communication applications.

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“…A factor which limits switching speed is the effects of energising current thermally induced parasitic transient frequencies, also known as chirp [27] , which produces an ambiguity in Doppler measurements [25] . As previously stated the application of a current modifies the laser cavity material refractive index, which results in a change in longitudinal laser cavity length and emitted frequency.…”

Section: Laser Module Design and Theory Of Operationmentioning

confidence: 99%

Development of a high-speed wideband wavelength tunable infra-red laser source for real time wind turbine array sensing applications

Mitchell

Janssen

Poor

2011

Integrated Photonics: Materials, Devices, and Applications

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This paper reports the development of an infra-red circa 193THz (~1.5µm) frequency tunable laser source selected and evaluated for photonic environment sensing systems. LIDAR (LIght Detection And Ranging) offers a method of remote wind speed measurement. Widespread deployment of the technique has been limited by the expense and complexity of LIDAR systems. However development of systems based on optical fiber and photonic components from the telecommunications industry promises improvements in cost, compactness, and reliability, so that it becomes viable to consider deployment of such systems on large wind turbines for the advance detection of fluctuations of wind speed. A monolithic multi-section laser, originally designed as a tunable source for telecommunications applications, has been modified and re-evaluated as a source for sensing applications, based on the technique of coherent laser radar (CLR), and coherent doppler LIDAR (CDL). A tunable frequency optical source should fulfil specific technical criteria to fulfil the applications requirements; speed of frequency selection, absolute accuracy of emitted frequency, spectral purity, and stability. Custom electronics and firmware were developed to realise an improvement in frequency switching speed by a factor of 10 relative to equivalent commercially available telecoms (DBR) sources, satisfying the target application requirements. An overview of the sensing architecture is presented, a detailed description of the fast tuning process described, including the custom hardware and firmware, and specifically the laser energising sequence. The results of the laser module are then presented with detailed consideration of the target application.

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Novel Frequency Chirp Compensation Scheme for Directly Modulated SG DBR Tunable Lasers

Cited by 12 publications

References 7 publications

Chirp-Compensated DBR Lasers for TWDM-PON Applications

Chirp-Compensated DBR Lasers for TWDM-PON Applications

Characterization and Direct Modulation of a Multi-Section PIC Suited for Short Reach Optical Communication Systems

Development of a high-speed wideband wavelength tunable infra-red laser source for real time wind turbine array sensing applications

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