scholarly journals Thermo-Optic Tunable Optical Filter Based on Fabry-Perot Microcavities in SOI

2012 ◽  
Vol 6-7 ◽  
pp. 194-199
Author(s):  
Zhe Li ◽  
Hua Juan Qi ◽  
Yong Chuan Xiao ◽  
Feng Li Gao
Keyword(s):  
Refractive Index ◽  
Wavelength Division Multiplexing ◽  
Optical Filter ◽  
Silicon On Insulator ◽  
Central Wavelength ◽  
Wavelength Division ◽  
Tunable Optical Filter ◽  
Compact Size ◽  
Fabry Perot ◽  
Output Characteristics

An integrated TOF (Tunable Optical Filter) based on thermo-optic effect in Silicon on insulator (SOI) rib waveguide is designed and simulated. The device is comprised of two high refractivity contrast Si/Air stacks, functioning as high reflectivity of DBRs and separated by a variable refractive index Si F-P cavity. The output characteristics are calculated and simulated based on Transfer Matrix Method (TMM). Wavelength tuning is achieved through thermal modulation of refractive variation of the cavity.As the cavity Si is heated,the refractive index of the cavity increases.When the temperature of cavity Si changes within100°C，the central wavelength gets a continuous 8nm shift from 1550nm to 1558nm, which is right located in the WDM (Wavelength division multiplexing) networks operating at C-band. Moreover, by calculating, the tuning sensitivity is about 0.08nm/°C. Owing to the compact size and excellent characteristics of integration, the proposed component has a promising utilization in spectroscopy and optical communication.

Tunable Optical Filter by Thermal Effect Based on MEMS Technology

2009 ◽  
Vol 74 ◽  
pp. 315-318
Author(s):  
Wu Zhang ◽  
Ji Fang Tao ◽  
Wei Ming Zhu ◽  
Hong Cai ◽  
Ai Qun Liu
Keyword(s):  
Refractive Index ◽  
Thermal Effect ◽  
Optical Filter ◽  
Resonant Mode ◽  
Physical Structure ◽  
Fiber Network ◽  
Wavelength Division ◽  
Tunable Optical Filter ◽  
Mechanical Methods ◽  
Mems Technology

In the broadband communication network, the wavelength-division-multiplexed (WDM) system is widely used to maximize the information that the signals can carry. As a result, the number of channels which are carried by different optical wavelengths in the WDM optical fiber network also keeps increasing. To separate the huge number of different wavelength signals, optical filter is required. The optical filter based on semiconductor has been widely studied due to the maturation of semiconductor fabrication technology and that it is possible to integrate the filter with the stable semiconductor devices such as laser diodes and MOSFETS. The tunable optical filter is basically a selective optical resonator that only allows the resonant modes passing through. Various mechanical methods are studied to achieve the tunable effect by tuning the physical structure of the filter; however, there is not much research on how the semiconductor material will affect the tuning function. In this paper, the author studied the influence of refractive index of the multi-silicon-slabs on the filter, whereby the tuning of refractive index is reached by thermal effect. It is found by simulation that when heating the silicon slabs, the increasing refractive index of silicon will lead to a shift of the resonant mode wavelength. This shift is almost linear with the change of the temperature, which is about 1nm with every 20K temperature increase. For certain devices, the result of the simulation showed it is possible to tune the resonant mode from C band to L band in the Fiber Optical Communication.

scholarly journals Polarization-independent tunable optical filter with variable bandwidth based on silicon-on-insulator waveguides

Nanophotonics ◽  
2018 ◽  
Vol 7 (8) ◽  
pp. 1469-1477 ◽  
Author(s):  
Haoyan Wang ◽  
Jincheng Dai ◽  
Hao Jia ◽  
Sizhu Shao ◽  
Xin Fu ◽  
...  
Keyword(s):  
Free Spectral Range ◽  
Optical Filter ◽  
Second Order ◽  
Silicon On Insulator ◽  
Microring Resonators ◽  
Central Wavelength ◽  
Variable Bandwidth ◽  
Tunable Optical Filter ◽  
Two Stages ◽  
Polarization Independent

AbstractWe present a polarization-independent tunable optical filter with variable bandwidth based on silicon-on-insulator (SOI) waveguides. The polarization-independent operation is achieved through the use of a polarization splitter-rotator and a polarization rotator-combiner, which are based on a bilevel adiabatic taper and an asymmetric directional coupler. Two stages of second-order microring resonators (MRRs) with different radii are used to achieve wavelength filtering with variable bandwidth and large free spectral range (FSR). Each stage of the second-order MRRs has a flat-top spectrum. The central wavelength of the filter is tuned by synchronous tuning of the two stages. The 3 dB bandwidth is adjusted via intentional misalignment of the passbands of the two stages. We demonstrate a prototype of such an optical filter on the SOI platform. The FSR of the fabricated device is about 90 nm. We show the tuning of the central wavelength from 1460 to 1550 nm. We adjust the 3 dB bandwidth from 37.5 to 100 GHz with a step of 12.5 GHz, with the overall insertion loss varying from −5.4 to −7.9 dB.

Electrically tunable optical filter for infrared wavelength using liquid crystals in a Fabry–Perot étalon

1990 ◽  
Vol 57 (17) ◽  
pp. 1718-1720 ◽  
Author(s):  
J. S. Patel ◽  
M. A. Saifi ◽  
D. W. Berreman ◽  
Chinlon Lin ◽  
N. Andreadakis ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Optical Filter ◽  
Infrared Wavelength ◽  
Tunable Optical Filter ◽  
Fabry Perot

Use Piezoelectric Bimorph for the Fiber Bragg Grating Tuner

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.

scholarly journals Temperatures effects on cascaded Mach-Zehnder interferometer structures

2020 ◽  
Vol 9 (6) ◽  
pp. 2427-2435
Author(s):  
Ary Syahriar ◽  
Rahmat Alamtaha ◽  
Zulkifli Alamtaha ◽  
Putri Wulandari
Keyword(s):  
Refractive Index ◽  
Fiber Optics ◽  
Output Power ◽  
Wavelength Division Multiplexing ◽  
Transfer Matrix Method ◽  
Effective Refractive Index ◽  
Wavelength Dependence ◽  
Zehnder Interferometer ◽  
Wavelength Division ◽  
Mach Zehnder Interferometer

To increase bandwidth and number of channels per fiber for more than one wavelength in the same fiber the dense wavelength division multiplexing (DWDM) technology has been utilized. One of the devices that are important in DWDM is an optical interleaver. This paper discussed the effects of temperatures in the DWDM interleaver by using the Mach-Zehnder interferometer (MZI) structures which is arranged in two-stage cascaded MZI and the three-stage cascaded MZI geometries. The main consequences of increase temperature inside the fiber optics are the change of effective refractive index in the material of silica fiber due to the thermo-optics effects. In our analysis we have used the transfer matrix method to investigate the wavelength dependence of output power to the temperatures changes that varies from 30oC to 430ºC. In the calculation we have used the C-Band range wavelength which is around 1530 to 1565 nm. It has been shown that the change of temperatures may shift the wavelength inside the MZI output power in linear manners. These effects may be used to tune wavelength transmission inside the MZI structures to suit the ITU-T defined grid. 

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