Tunable all-optical wavelength broadcasting in a PPLN with multiple QPM peaks

Ahlawat, Meenu; Tehranchi, Amirhossein; Pandiyan, Krishnamoorthy; Cha, Myoungsik; Kashyap, Raman

doi:10.1364/oe.20.027425

Cited by 34 publications

(11 citation statements)

References 15 publications

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“…The phase reversal grating structure includes π-phase shifting domains of length  for the second harmonic wave between periodically poled-domain devices [3][4][5][6]. The phase shifting domains have the same length as the grating period , where coherence length, l c = /2.…”

Section: Theorymentioning

confidence: 99%

Analysis of Phase reversed QPM structure for parametric three wave mixing

Meetei

Boomadevi

Pandiyan

2014

12th International Conference on Fiber Optics and Photonics

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Section: Theorymentioning

confidence: 99%

Analysis of Phase reversed QPM structure for parametric three wave mixing

Meetei

Boomadevi

Pandiyan

2014

12th International Conference on Fiber Optics and Photonics

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“…Highly efficient alloptical wavelength converter is the highly demanded tool in an optical communication system. It is due to the flexibility and capability to deliver the data payload simultaneously from the source to the destination without being converted from an electronic domain in the optical fiber-based WDM network [10]. In this context, quasi-phase matching (QPM) devices play a vital role.…”

Section: Introductionmentioning

confidence: 99%

Multiple quasi-phase-matched second-harmonic generation in phase reversal optical superlattice structure

et al. 2019

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Domain-engineered quasi-phase-matching (QPM) devices are known for its versatility and ability to tune the nonlinear optical frequency conversion process. In this paper, a simple approach is presented to generate multiple quasi-phase-matched second-harmonic generation (SHG) in the phase reversal optical superlattice (PROS) structure. Theoretical studies are carried out by simulation based on the domain reversed lithium niobate QPM devices. The nature of the generated multiple SHG spectra is analyzed when the phase reversal (PR) domains are distributed at equal and unequal intervals along the length of the device. The distribution of phase reversal domains at equal intervals is limited to the generation of dual SHG peaks irrespective of its number. On the contrary, we could generate equal-intensity multiple SHG peaks with PR domains distribution at unequal interval. Using this scheme, five peaks QPM SHG are generated by distributing four PR domains in specific locations of the PROS QPM device. The dependency of the PR domain and its location in the PROS QPM device are analyzed to design desirable multi-wavelength converters.Publisher's Note Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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“…Moreover, as the effective period of uniform grating changes by angular rotation and temperature, fine alignment and a controlled temperature are required to obtain maximum efficiency for the central wavelength of a pump. Also, accurate temperature tuning is necessary for uniform gratings to tune the up-conversion wavelength 25, 26 . However, to convert the entire wide BW of a pump laser, especially in a tunable way, a broadband converter is required.…”

Section: Introductionmentioning

confidence: 99%

Super-tunable, broadband up-conversion of a high-power CW laser in an engineered nonlinear crystal

Bostani

Tehranchi

Kashyap

2017

Sci Rep

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A specially-designed chirped periodically poled lithium niobate nonlinear crystal was fabricated with a phase-matching bandwidth as large as 50 nm for sum frequency generation to operate at room and higher temperatures. This device also benefits from insensitivity to laser frequency drift and fine alignment. The loosely-focused beam position of a high-power CW laser at around 1550 nm is optimized within the grating for maximum up-conversion efficiency, to realize a super-tunable source in the range of 770-778 nm by tuning a narrowband control signal over 30 nm in the communication band. This device is demonstrated to be fully phased-matched simultaneously for both second-order nonlinear up-conversion processes, namely second harmonic generation and sum frequency generation. The measurement of the generated sum-frequency power versus wavelength agrees well with the theory. The device allows for the creation of tunable broadband CW sources at shorter wavelengths with potentially high power.There is increasing demand for tunable and broadband sources at shorter wavelengths due to many applications in biomedicine and spectroscopy [1][2][3] . Owing to the lack of suitable sources, a feasible approach is the frequency conversion of available lasers in nonlinear materials [4][5][6] . Recently, high-power fiber lasers have attracted huge attention 7 , however, these lasers in the form of continuous wave (CW) generally possess a bandwidth (BW) in the order of hundreds of GHz proportional to the laser output power due to the use of fiber Bragg gratings 8 or four-wave mixing (FWM) between the different longitudinal modes 7,9 . Further, these high-power fiber lasers are only available in limited wavelength ranges 10 . In addition, they experience a drift in their central wavelength when the output power varies 11,12 . Nevertheless, in order to realize tunable CW sources at desired higher frequencies, up-conversion based on second-order nonlinearities using engineered quasi-phase-matching (QPM) in nonlinear crystals can be exploited with several advantages [13][14][15][16][17] . There are many works on second harmonic generation (SHG) and sum frequency generation (SFG) using QPM in uniform gratings in the form of periodically poled crystals 15, 18-23 . However, uniform gratings limit the BW of up-conversion process (and consequently the tunability) as it is inversely proportional to the length of a grating 24 . Since the up-conversion efficiency (assuming an undepleted pump) is increased by the length squared, using a long grating leads to a reduction in the up-converted BW of a few-nm-wide pump and consequently results in a waste of power whilst a short grating up-converts the whole BW with a very low efficiency. Also, at higher pump powers, the use of a short grating may lead to the crystal damage in order to achieve efficiencies comparable to those of longer gratings. Moreover, as the effective period of uniform grating changes by angular rotation and temperature, fine alignment and a controlled temperature are required t...

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Tunable all-optical wavelength broadcasting in a PPLN with multiple QPM peaks

Cited by 34 publications

References 15 publications

Analysis of Phase reversed QPM structure for parametric three wave mixing

Analysis of Phase reversed QPM structure for parametric three wave mixing

Multiple quasi-phase-matched second-harmonic generation in phase reversal optical superlattice structure

Super-tunable, broadband up-conversion of a high-power CW laser in an engineered nonlinear crystal

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