A Photonic Comb Filter With Independently and Digitally Tunable Bandwidth and Frequency Spacing

2011 ◽  
Vol 23 (13) ◽  
pp. 857-859 ◽  
Author(s):  
L.-S Yan ◽  
J Ye ◽  
H.-Y Jiang ◽  
W Pan ◽  
B Luo ◽  
...  
Keyword(s):  
Comb Filter ◽  
Frequency Spacing

Tunable C + L bands triple frequency spacing multi-wavelength Brillouin-erbium fiber laser

2021 ◽  
Vol 64 ◽  
pp. 102535
Author(s):  
A. Ismail ◽  
M.H. Al-Mansoori ◽  
F. Abdullah ◽  
M.Z. Jamaludin ◽  
M. Al-Qartoubi ◽  
...  
Keyword(s):  
Fiber Laser ◽  
Triple Frequency ◽  
Frequency Spacing ◽  
Multi Wavelength

scholarly journals Design and Implementation of a Farrow-Interpolator-Based Digital Front-End in LTE Receivers for Carrier Aggregation

Electronics ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 231
Author(s):  
Chester Sungchung Park ◽  
Sunwoo Kim ◽  
Jooho Wang ◽  
Sungkyung Park
Keyword(s):  
Integrated Circuit ◽  
Building Block ◽  
Orthogonal Frequency Division Multiplexing ◽  
Critical Path ◽  
Phase Error ◽  
System Level ◽  
Comb Filter ◽  
Carrier Aggregation ◽  
Path Delay ◽  
Front End

A digital front-end decimation chain based on both Farrow interpolator for fractional sample-rate conversion and a digital mixer is proposed in order to comply with the long-term evolution standards in radio receivers with ten frequency modes. Design requirement specifications with adjacent channel selectivity, inband blockers, and narrowband blockers are all satisfied so that the proposed digital front-end is 3GPP-compliant. Furthermore, the proposed digital front-end addresses carrier aggregation in the standards via appropriate frequency translations. The digital front-end has a cascaded integrator comb filter prior to Farrow interpolator and also has a per-carrier carrier aggregation filter and channel selection filter following the digital mixer. A Farrow interpolator with an integrate-and-dump circuitry controlled by a condition signal is proposed and also a digital mixer with periodic reset to prevent phase error accumulation is proposed. From the standpoint of design methodology, three models are all developed for the overall digital front-end, namely, functional models, cycle-accurate models, and bit-accurate models. Performance is verified by means of the cycle-accurate model and subsequently, by means of a special C++ class, the bitwidths are minimized in a methodic manner for area minimization. For system-level performance verification, the orthogonal frequency division multiplexing receiver is also modeled. The critical path delay of each building block is analyzed and the spectral-domain view is obtained for each building block of the digital front-end circuitry. The proposed digital front-end circuitry is simulated, designed, and both synthesized in a 180 nm CMOS application-specific integrated circuit technology and implemented in the Xilinx XC6VLX550T field-programmable gate array (Xilinx, San Jose, CA, USA).

Switchable and flexible comb filter/interleaver based on ring-resonators with tunable couplers

2020 ◽  
pp. 1-1
Author(s):  
Weiguo Jiang ◽  
Yundong Zhang ◽  
Ying Guo ◽  
Fuxing Zhu ◽  
Guo Yi
Keyword(s):  
Ring Resonators ◽  
Comb Filter

Comb Filter-Based Fiber-Optic Methane Sensor System With Mitigation of Cross Gas Sensitivity

2012 ◽  
Vol 30 (19) ◽  
pp. 3103-3109 ◽  
Author(s):  
Duan Liu ◽  
Songnian Fu ◽  
Ming Tang ◽  
Perry Shum ◽  
Deming Liu
Keyword(s):  
Fiber Optic ◽  
Sensor System ◽  
Comb Filter ◽  
Gas Sensitivity ◽  
Methane Sensor

A flat and broadband optical frequency comb with tunable bandwidth and frequency spacing

2014 ◽  
Vol 331 ◽  
pp. 262-266 ◽  
Author(s):  
Lei Shang ◽  
Aijun Wen ◽  
Guibin Lin ◽  
Yongsheng Gao
Keyword(s):  
Frequency Comb ◽  
Optical Frequency Comb ◽  
Optical Frequency ◽  
Frequency Spacing

A novel tunable multi-wavelength Brillouin fiber laser with switchable frequency spacing

2015 ◽  
Vol 340 ◽  
pp. 74-79 ◽  
Author(s):  
Lifen Qian ◽  
Danqi Fen ◽  
Heng Xie ◽  
Junqiang Sun
Keyword(s):  
Fiber Laser ◽  
Frequency Spacing ◽  
Multi Wavelength

Polarization-Independent All-Fibre Comb Filter with Dynamically Halved Channel Spacing

2005 ◽  
Vol 22 (5) ◽  
pp. 1159-1161 ◽  
Author(s):  
Ma Xiu-Rong ◽  
Kai Gui-Yun ◽  
Wu Zhi-Fang ◽  
Guo Hong-Lei ◽  
Zhang Hao ◽  
...  
Keyword(s):  
Comb Filter ◽  
Channel Spacing ◽  
Polarization Independent
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