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US 2002/0176152 A1Published application
Intensity modulation of optical signals
OwnerPaola Parolari, Lucia Marazziinventors
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OwnerPaola Parolari, Lucia Marazziinventors
Estimating the term…
A wavelength converter or demultiplexer device comprising first and second stages (30, 40). For wavelength converter action, the first stage impresses an intensity modulation (IM) and phase modulation (PM) on a CW input signal (λ1) carried by an input DATA signal (λ2) using cross phase modulation in a non-linear optical element (46). The first stage in an embodiment is a semiconductor laser amplifier loop optical mirror (SLALOM) which has a semiconductor optical amplifier (SOA) as the non-linear optical element. The second stage has a non-linear transfer function and impresses a further IM on the optical signal responsive to the PM impressed in the first stage. In an embodiment, the second stage is a polarization maintaining fiber (PMF) optical loop. The transfer function of the overall device is thus improved by making it steeper and more time confined. This is achieved by combining a fast first stage with a second stage that has a non-linear transfer function, so that the residual PM from the first stage synchronously drives a nonlinear process in the second stage.
A device for intensity modulating an optical data signal, the device comprising:
A device according to any one of the preceding claims, wherein the second stage has a transfer function of transmission versus frequency that has a low transmission value (Tlow) at the first frequency (ω1/2π) and a high transmission value (Thigh) at a frequency equal to the first frequency plus the maximum instantaneous frequency deviation (ω1/2π+Δfmax).
A device according to any one of the preceding claims, wherein the first stage has a frequency response of 10 Gbit/s or higher.
A method of intensity modulating an optical data signal, the method comprising:
A method of wavelength converting a return-zero (RZ) optical signal, the method comprising:
A method of demultiplexing a time division multiplexed return-zero (RZ) optical signal, the method comprising:
Dependencies are inferred from the claim text.