Coherent light generators – Particular beam control device – Tuning
Reexamination Certificate
2005-05-25
2010-02-02
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular beam control device
Tuning
Reexamination Certificate
active
07656911
ABSTRACT:
To facilitate phase adjustment in an external resonator type wavelength-variable laser. An external resonator type wavelength-variable laser (50) includes a semiconductor light amplifier (1), a wavelength selection filter (3) having periodic frequency characteristics, an external resonator (6), and a wavelength-variable filter (4). Δf is divided into one or more regions. The following conditions are satisfied for one Δfiregion: mj=(j×Δffs)/ΔfFPwhere Δffs: a period of the wavelength selection filter, ΔfFP: a Fabry-Perot mode interval dependent on a length of the external resonator, j: an integer not smaller than 1 and not larger than (Δfi/Δffs). A coefficient Mjis an integer obtained by rounding off the first digit after decimal point of the coefficient mj. A coefficient Ni,jis an integer obtained by discarding the first digit after decimal point of Δfi/(j×Δffs). In this regard, a relation of (|Ni,j×2π(Mj−mj)|<π/2) is satisfied for one j.
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De Merlier Jan
Kudo Koji
Mizutani Kenji
Sato Kenji
Carter Michael
Harvey Minsun
NEC Corporation
Young & Thompson
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