Compact in-line optical notch filter based on an asymmetric microfiber coupler

Shi, Lei; Liu, Yang; Wang, Zheqi; Zhang, Chi

doi:10.1364/ao.52.008834

Cited by 17 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our work, microfibers are applied to light coupling and the excitement of WGMs because they have a large evanescent light field resulting from their subwavelength diameters. 38,39 Under the control of the pump light, WGMs will be evidently controlled by the interaction between the pump light and the MF. Experimental results show that this novel AOTOFRR has a high tuning sensitivity with a large tuning range.…”

Section: Introductionmentioning

confidence: 99%

All-optical tuning of a magnetic-fluid-filled optofluidic ring resonator

Liu

Shi

et al. 2014

Lab Chip

Self Cite

View full text Add to dashboard Cite

An all-optical tunable optofluidic ring resonator (OFRR) is proposed and experimentally demonstrated. The all-optical control of a silica microresonator is highly attractive, but it is difficult to realize because of the relatively weak Kerr effect and the absence of a plasma dispersion effect of silica. Here, we infuse a silica microcapillary-based optofluidic ring resonator with a magnetic fluid, into which pump light is injected by a fiber taper. Iron oxide nanoparticles dispersed in the magnetic fluid produce a strong pump light absorption, and this leads to a resonance shift of the silica microresonator due to the photothermal effect. To the best of our knowledge, this is the first scheme for all-optical tuning of an OFRR. A tuning sensitivity of up to 0.15 nm mW(-1) and a tuning range of 3.3 nm are achieved. With such excellent performance, the magnetic-fluid-filled OFRR has great potential in filtering, sensing, and signal processing applications.

show abstract

Section: Introductionmentioning

confidence: 99%

All-optical tuning of a magnetic-fluid-filled optofluidic ring resonator

Liu

Shi

et al. 2014

Lab Chip

Self Cite

View full text Add to dashboard Cite

show abstract

“…The microbottle cavity doped with Er 3+ ions through an improved doping method possesses a Q factor of about 5.2 × 10 7 in the 1550 nm band. In order to excite Er 3+ ions and achieve laser emission, the continuous-wave pump light in the 980 nm band with a line width of about 1 nm is coupled into the microcavity through the silica microfiber. − Besides, the tapered area of the microbottle is attached with a spherical end, in which iron oxide nanoparticles are coated onto its surface. Due to excellent photothermal performance of iron oxide nanoparticles, the control light fed through the axial direction of the microbottle is converted to heat and all-optical tuning of the lasing wavelength with a range of 4.4 nm is achieved.…”

mentioning

confidence: 99%

All-Optical Tunable Microlaser Based on an Ultrahigh-Q Erbium-Doped Hybrid Microbottle Cavity

et al. 2018

Self Cite

View full text Add to dashboard Cite

An all-optical tunable microlaser based on the ultrahigh-quality (Q)-factor erbium-doped hybrid microbottle cavity is proposed and experimentally demonstrated for the first time. All-optical wavelength tunability of the silica microcavity laser is a very attractive feature and has been rarely reported. By using an improved doping method, the erbium-doped silica microbottle cavity with a Q factor of 5.2 × 107 in the 1550 nm band is obtained, which is higher than the previous work based on the conventional sol–gel method. Through nonresonant pump in the 980 nm band, a lasing threshold of 1.65 mW is achieved, which is lower than all those realized through the same pump method. Besides, iron oxide nanoparticles are coated on the tapered area by doping them in the ultraviolet curing adhesive in order to precisely control the coating area, which enables the hybrid microcavity to maintain the ultrahigh Q factor and possess large tunability. By feeding the control light through the axial direction of the microbottle cavity, the lasing wavelength is all-optically tuned with a range of 4.4 nm, which is larger than the reported doped silica microcavity lasers. This work has great potential in applications such as optical communications, sensing, and spectroscopy.

show abstract

“…Due to the asymmetry of the two OMFs, the transmission spectrum of the sensor has only one resonant dip and there is a certain coupling length for the coupler. Based on Equation (1), the full-width at half-maximum (FWHM) bandwidth of the asymmetric OMF coupler at the out port can be expressed as [ 29 ]

where n g1 and n g2 are the modal group indices of the two OMFs with m = 0, 1, 2,… According to Equation (3), the bandwidth of the transmission spectrum is inversely proportional to the modal group index difference. Therefore, if the two OMFs are asymmetric, the bandwidth can be obviously compressed.…”

Section: Sensor Principlementioning

confidence: 99%

Modeling of a Single-Notch Microfiber Coupler for High-Sensitivity and Low Detection-Limit Refractive Index Sensing

Zhang

Shi

Zhu

et al. 2016

Sensors

Self Cite

View full text Add to dashboard Cite

A highly sensitive refractive index sensor with low detection limit based on an asymmetric optical microfiber coupler is proposed. It is composed of a silica optical microfiber and an As2Se3 optical microfiber. Due to the asymmetry of the microfiber materials, a single-notch transmission spectrum is demonstrated by the large refractive index difference between the two optical microfibers. Compared with the symmetric coupler, the bandwidth of the asymmetric structure is over one order of magnitude narrower than that of the former. Therefore, the asymmetric optical microfiber coupler based sensor can reach over one order of magnitude smaller detection limit, which is defined as the minimal detectable refractive index change caused by the surrounding analyte. With the advantage of large evanescent field, the results also show that a sensitivity of up to 3212 nm per refractive index unit with a bandwidth of 12 nm is achieved with the asymmetric optical microfiber coupler. Furthermore, a maximum sensitivity of 4549 nm per refractive index unit can be reached while the radii of the silica optical microfiber and As2Se3 optical microfiber are 0.5 μm and a 0.128 μm, respectively. This sensor component may have important potential for low detection-limit physical and biochemical sensing applications.

show abstract

Compact in-line optical notch filter based on an asymmetric microfiber coupler

Cited by 17 publications

References 24 publications

All-optical tuning of a magnetic-fluid-filled optofluidic ring resonator

All-optical tuning of a magnetic-fluid-filled optofluidic ring resonator

All-Optical Tunable Microlaser Based on an Ultrahigh-Q Erbium-Doped Hybrid Microbottle Cavity

Modeling of a Single-Notch Microfiber Coupler for High-Sensitivity and Low Detection-Limit Refractive Index Sensing

Contact Info

Product

Resources

About