Second-order fiber interleaving filter based on polarization-diversified loop

Abstract. A second-order fiber interleaving filter that can provide a channel interleaving capability in second-order comb spectra is proposed and demonstrated on the basis of a polarization-diversified loop comprised of a four-port polarization beam splitter, four rotatable half-wave plates (HWPs), and three high birefringence fiber (HBF) segments. Each HBF segment is positioned between two adjoining HWPs, and two HWPs located among the three HBF segments determine the effective angular orientation difference among their principal axes, or fast and slow axes. At specific orientation angles of the four HWPs, second-order comb spectra such as flat-top and narrow-band ones could be obtained with a free spectral range (FSR) of ∼0.792  nm. In particular, the frequency interleaving of these second-order comb spectra, that is, a half FSR switching, could be implemented by controlling two out of four HWPs, which is the first demonstration of the interleaving operation in second-order comb spectra without expensive birefringence modulators. These spectral characteristics of the proposed filter were theoretically predicted and experimentally demonstrated.

[1]  Byoungho Lee,et al.  Tunable multiwavelength fiber laser employing a comb filter based on a polarization-diversity loop configuration , 2006 .

[2]  Gang-Ding Peng,et al.  Analysis of polarization-independent tunable optical comb filter by cascading MZI and phase modulating Sagnac loop , 2011 .

[3]  Li Wei,et al.  A wavelength spacing switchable and TUNABLE high‐birefringence fiber loop mirror filter , 2014 .

[4]  Hanlin Feng,et al.  High-speed wavelength tunable DPSK demodulation using a phase modulator based loop mirror filter. , 2014, Optics letters.

[5]  Lianqing Zhu,et al.  Tunable and switchable thulium-doped fiber laser utilizing Sagnac loops incorporating two-stage polarization maintaining fibers , 2016 .

[6]  Byoungho Lee,et al.  Channel-Spacing- and Wavelength-Tunable Multiwavelength Fiber Ring Laser Using Semiconductor Optical Amplifier , 2006, IEEE Photonics Technology Letters.

[7]  X Steve Yao,et al.  Comb filter with independently tunable wavelength spacing and bandwidth using cascaded variable differential group delay elements. , 2011, Optics letters.

[8]  Byoungho Lee,et al.  Wavelength-switchable flat-top fiber comb filter based on a Solc type birefringence combination. , 2005, Optics express.

[9]  Zhi-Chao Luo,et al.  Polarization-Independent, Multifunctional All-Fiber Comb Filter Using Variable Ratio Coupler-Based Mach–Zehnder Interferometer , 2012, Journal of Lightwave Technology.

[10]  Kyongsoo Park,et al.  Zeroth- and First-Order-Convertible Fiber Interleaving Filter , 2016, IEEE Photonics Journal.

[11]  Xueguang Qiao,et al.  An in-line quasi-Sagnac interferometer based comb filter used for tunable multi-wavelength fiber laser , 2015 .

[12]  R. Jones,et al.  New calculus for the treatment of optical systems. VIII. Electromagnetic theory , 1956 .

[13]  Byoungho Lee,et al.  Polarization-independent all-fiber multiwavelength-switchable filter based on a polarization-diversity loop configuration. , 2003, Optics express.

[14]  Qing Ye,et al.  Tunable Multiwavelength Passively Mode-Locked Fiber Ring Laser Using Intracavity Birefringence-Induced Comb Filter , 2010, IEEE Photonics Journal.

[15]  Byoungho Lee,et al.  Polarization-independent tunable fiber comb filter , 2004, IEEE Photonics Technology Letters.

[16]  C. Allen,et al.  A subnanosecond polarization-independent tunable filter/wavelength router using a Sagnac interferometer , 1997, IEEE Photonics Technology Letters.

[17]  Shizhong Xie,et al.  Label erasing technique employing Lyot-Sagnac filter , 2002 .

[18]  Xinying Li,et al.  Simple scheme for PDM-QPSK payload generation in an optical label switching network , 2016, IEEE/OSA Journal of Optical Communications and Networking.

[19]  N. Calabretta,et al.  All-Optical Label Swapping of Scalable In-Band Address Labels and 160-Gb/s Data Packets , 2009, Journal of Lightwave Technology.

[20]  Zhi-Chao Luo,et al.  Wavelength switchable flat-top all-fiber comb filter based on a double-loop Mach-Zehnder interferometer. , 2010, Optics express.

[21]  M. Saruwatari,et al.  Ultrafast polarisation-independent optical demultiplexer using optical carrier frequency shift through crossphase modulation , 1992 .

[22]  Yong-Wook Lee,et al.  Second-order all-fiber comb filter based on polarization-diversity loop configuration. , 2008, Optics express.

[23]  O. Pottiez,et al.  Tuneable sagnac comb filter including two wave retarders , 2010 .

[24]  J.U. Kang,et al.  Tunable dual-wavelength all-PM fiber ring laser , 2002, IEEE Photonics Technology Letters.

[25]  Yang Junfeng,et al.  Tunable microwave generation method based on birefringence photonic crystal fiber , 2016 .

[26]  Songhyun Jo,et al.  Study on Transmission and Output Polarization Characteristics of a First-Order Lyot-Type Fiber Comb Filter Using Polarization-Diversity Loop , 2015, IEEE Photonics Journal.

[27]  Guoyong Sun,et al.  Tunable multiwavelength fiber laser using a comb filter based on erbium-ytterbium co-doped polarization maintaining fiber loop mirror. , 2008, Optics express.

[28]  T. Hasegawa,et al.  Polarization independent frequency conversion by fiber four-wave mixing with a polarization diversity technique , 1993, IEEE Photonics Technology Letters.