Wavelength spacing tenable capability of optical comb filter using Polarization Maintaining Fiber

Sikta, Jebun Naher; Islam, Md. Saiful; Rasel, Omar Faruk; Ripa, N. N

doi:10.9790/4861-06335762

Cited by 3 publications

(2 citation statements)

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“…Double Sagnac loops have been reported as an alternative wavelength-selective filter, however, they produce an irregular output spectrum caused by the imprecise refractive index difference of PMFs, splicing loss, and imprecise length of PMFs 19 . Mach–Zehnder interferometer (MZI)-based comb-filter has been considered to be the superior option among the varieties previously mentioned structures due to its advantageous properties of high dependability and environmental change insensitivity 20 …”

Section: Introductionmentioning

confidence: 99%

“…19 Mach-Zehnder interferometer (MZI)-based comb-filter has been considered to be the superior option among the varieties previously mentioned structures due to its advantageous properties of high dependability and environmental change insensitivity. 20 In this regard, several methods have been extensively studied to fabricate all-fiber comb filters based on MZI structures, such as the fabrication of an MZI that is composed of two 3 dB couplers combined with a polarization controller (PC) allows switching the multi-wavelength lasing of an EDFL has the advantages of low loss, simple structure, and low cost. 21 Another, MZI structures based on tapered fibers have gained popularity in the field of tunable and multi-wavelength fiber lasers.…”

Section: Introductionmentioning

confidence: 99%

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Fiber laser with dual-channel and a selectable comb filter based on Vernier effect of parallel-connected two Mach–Zehnder interferometers

2023

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We propose and demonstrate the implementation and application of a new configuration of an all-fiber comb filter based on the Vernier effect produced by parallelconnected two in-line Mach-Zehnder interferometers (MZIs). Each in-line MZI was fabricated by fusion splicing a section of panda-type polarization maintaining fiber (PMF) with peanut-shaped tapers between two single-mode fibers. These two in-line MZIs, respectively, form reference and sensing interferometers, which are parallelconnected by two 3-dB optical fiber couplers to realize the Vernier effect. By incorporating the proposed comb-filter into the erbium-doped fiber laser cavity, two output channels at 1533.2 and 1558.2 nm have been achieved. Further, the combination of the parallel-connected two in-line MZIs and polarization controllers (PC1 and PC2) promotes the lasing in a switchable and selective way. To the best of the authors' knowledge, this is the first demonstration of a comb filter that employs paralleled two peanut-shaped MZIs in PMF. The experimental results indicate that the proposed filter has the potential to be used in communication systems.

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Section: Introductionmentioning

confidence: 99%