Network experiment using an 8000 GHz tuning-range optical filter

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

Download Full-text

A MEMS-based all-dielectric tunable optical filter with increased tuning range

10.1117/12.545346 ◽

2004 ◽

Author(s):

Dennis Hohlfeld ◽

Hans Zappe

Keyword(s):

Tuning Range ◽

Optical Filter ◽

Tunable Optical Filter

Download Full-text

Use Piezoelectric Bimorph for the Fiber Bragg Grating Tuner

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.143-144.196 ◽

2010 ◽

Vol 143-144 ◽

pp. 196-200

Author(s):

Xiao Li Zhang ◽

Da Kai Liang ◽

Jie Zeng

Keyword(s):

Fiber Bragg Grating ◽

Tuning Range ◽

High Efficiency ◽

Optical Filter ◽

Bragg Grating ◽

Operating Voltage ◽

Piezoelectric Bimorph ◽

Central Wavelength ◽

Tunable Optical Filter ◽

Before And After

A wavelength tunable optical filter based on a fiber Bragg grating using piezoelectric bimorph is realized in this paper, and the tuning condition is theoretically and experimentally analyzed. The Bragg central wavelength of the filter can be easily tuned adopting to a DC voltage. The maximum strain of the central wavelength depends upon the maximum operating voltage, and the tuning range efficiency was as high as 1.2pm/V, the reflectivity, shape and the reflective spectrums of the fiber Bragg grating central wavelength almost keep unchanged before and after tunning. This paper provides a reference for optical fiber Bragg grating tuner.with high efficiency.

Download Full-text

1.5 mu m optical filter using a two-section Fabry-Perot laser diode with wide tuning range and high constant gain

IEEE Photonics Technology Letters ◽

10.1109/68.56599 ◽

1990 ◽

Vol 2 (6) ◽

pp. 401-403 ◽

Cited By ~ 11

Author(s):

T. Numai

Keyword(s):

Laser Diode ◽

Tuning Range ◽

Optical Filter ◽

Wide Tuning Range ◽

Fabry Perot

Download Full-text

An electro-optically tunable optical filter with an ultra-large-wavelength tuning range

10.1117/12.711585 ◽

2006 ◽

Cited By ~ 1

Author(s):

Rohit Samarth ◽

Miao Li ◽

Xuejun Lu

Keyword(s):

Tuning Range ◽

Optical Filter ◽

Wavelength Tuning ◽

Tunable Optical Filter ◽

Large Wavelength

Download Full-text

An approach to control tuning range and speed in 1D ternary photonic band gap material nano-layered optical filter structures electro-optically

10.1063/1.4946366 ◽

2016 ◽

Author(s):

Shahneel Zia ◽

Anirudh Banerjee

Keyword(s):

Band Gap ◽

Tuning Range ◽

Photonic Band Gap ◽

Optical Filter ◽

Photonic Band Gap Material ◽

Filter Structures ◽

Photonic Band

Download Full-text

Performance and Reliability of a MEMS-based tunable optical filter operating in the 1565 nm-1525 nm wavelength range

MRS Proceedings ◽

10.1557/proc-722-k6.3 ◽

2002 ◽

Vol 722 ◽

Author(s):

T. S. Sriram ◽

B. Strauss ◽

S. Pappas ◽

A. Baliga ◽

A. Jean ◽

...

Keyword(s):

Silicon Nitride ◽

Line Width ◽

Insertion Loss ◽

Optical Filter ◽

Single Mode ◽

Single Mode Fiber ◽

Reliability Testing ◽

Silicon Nitride Membrane ◽

Tunable Optical Filter ◽

Extensive Performance

AbstractThis paper describes the results of extensive performance and reliability characterization of a silicon-based surface micro-machined tunable optical filter. The device comprises a high-finesse Fabry-Perot etalon with one flat and one curved dielectric mirror. The curved mirror is mounted on an electrostatically actuated silicon nitride membrane tethered to the substrate using silicon nitride posts. A voltage applied to the membrane allows the device to be tuned by adjusting the length of the cavity. The device is coupled optically to an input and an output single mode fiber inside a hermetic package. Extensive performance characterization (over operating temperature range) was performed on the packaged device. Parameters characterized included tuning characteristics, insertion loss, filter line-width and side mode suppression ratio. Reliability testing was performed by subjecting the MEMS structure to a very large number of actuations at an elevated temperature both inside the package and on a test board. The MEMS structure was found to be extremely robust, running trillions of actuations without failures. Package level reliability testing conforming to Telcordia standards indicated that key device parameters including insertion loss, filter line-width and tuning characteristics did not change measurably over the duration of the test.

Download Full-text

Power Efficient Implementation of Low Noise CMOS LC VCO using 32nm Technology for RF Applications

International Journal of Emerging Research in Management and Technology ◽

10.23956/ijermt.v6i8.118 ◽

2018 ◽

Vol 6 (8) ◽

pp. 53

Author(s):

Shitesh Tiwari ◽

Sumant Katiyal ◽

Parag Parandkar

Keyword(s):

Power Consumption ◽

Phase Noise ◽

Tuning Range ◽

Low Voltage ◽

Performance Comparison ◽

Low Noise ◽

Center Frequency ◽

Voltage Controlled Oscillator ◽

Low Phase Noise ◽

Lc Vco

Voltage Controlled Oscillator (VCO) is an integral component of most of the receivers such as GSM, GPS etc. As name indicates, oscillation is controlled by varying the voltage at the capacitor of LC tank. By varying the voltage, VCO can generate variable frequency of oscillation. Different VCO Parameters are contrasted on the basis of phase noise, tuning range, power consumption and FOM. Out of these phase noise is dependent on quality factor, power consumption, oscillation frequency and current. So, design of LC VCO at low power, low phase noise can be obtained with low bias current at low voltage. Nanosize transistors are also contributes towards low phase noise. This paper demonstrates the design of low phase noise LC VCO with 4.89 GHz tuning range from 7.33-11.22 GHz with center frequency at 7 GHz. The design uses 32nm technology with tuning voltage of 0-1.2 V. A very effective Phase noise of -114 dBc / Hz is obtained with FOM of -181 dBc/Hz. The proposed work has been compared with five peer LC VCO designs working at higher feature sizes and outcome of this performance comparison dictates that the proposed work working at better 32 nm technology outperformed amongst others in terms of achieving low Tuning voltage and moderate FoM, overshadowed by a little expense of power dissipation.

Download Full-text