Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1995-02-14
1997-04-29
Boudreau, Leo
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359175, 359177, 359341, H04B 1016, H04B 1002, H01S 300
Patent
active
056254814
ABSTRACT:
Spontaneous emission occurring in association with direct optical amplification using an erbium-doped optical fiber is modulated with an auxiliary signal, such as a supervisory signal, for transmission of the auxiliary signal. In a first aspect of the invention, the output of an optical amplifier is passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, to modulate the spontaneous emission component contained in the optical amplifier output. In a second aspect of the invention, the output of the optical amplifier is separated by an optical branching device into a main optical signal and part of the spontaneous emission. The separated spontaneous emission component is modulated by being passed through a variable optical band-pass filter whose transmission characteristic is varied in accordance with the auxiliary signal, and then, the modulated spontaneous emission component is wavelength-division multiplexed with the main optical signal.
REFERENCES:
patent: 5175641 (1992-12-01), Boerstler et al.
patent: 5309268 (1994-05-01), Nakamura et al.
patent: 5394265 (1995-02-01), Nagel et al.
patent: 5442479 (1995-08-01), Bulow et al.
patent: 5506724 (1996-04-01), Shimizu et al.
Itou Hiroyuki
Kawasaki Yumiko
Shima Michikazu
Takahashi Tsukasa
Tamura Yuji
Boudreau Leo
Fujitsu Limited
Mehta Bhavesh
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