Integrated optical demultiplexer for WDM communication systems

Fischer, U. H. P.; Höll, S.; Haupt, Matthias; Joncic, Mladen

doi:10.1109/estc.2016.7764453

Cited by 1 publication

(1 citation statement)

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“…Demultiplexer split the mixed light up into many mixed outputs (one per required output power) and then filter each port individually. There are several searches published about multiplexer/demultiplexers [1][2][3][4][5][6]7]. The signal pulses will be broadened [6] and so we need a very sharp cutoff filters with demultiplexers [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optical Demultiplexer by Using In-Line Fiber Filter

Zaghloul

Eldin

2023

Delta University Scientific Journal

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The signal pulses will be broadened through the fiber and so we need a very sharp cutoff filters with demultiplexers. The in-line fiber filter becomes the appropriate filters. Most of these demultiplexers used after erbium-doped fiber amplifier (EDFA) which need a sharp wavelength bandpass filter (BPF) to filter out wavelengths other than the signal wavelength Exact analysis of in-line fiber filter is occurred by derive a polynomial expression for the dopant ratios of GeO2 and P2O5. The refractive index of silica doped either GeO2 or P2O5 is defined as a function of both the wavelength and the dopant ratio. The calculations of the dopant ratios of the pair materials (GeO2 and P2O5) are done at a specific filter cutoff wavelength (λc) for both high pass filter (HPF) and low pass filter (LPF). Two in-line fiber filters (HPF and LPF) are cascaded to make a sharp bandpass filter (BPF). The length of in-line fiber filter must be very short to overcome the weak of the propagation constsnt throuh it. The normalized frequency is discused. A theoritical 8-channels demultiplexer is done. The design of demultiplexer becomes very easy.

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