Coherent light generators – Particular beam control device – Mode locking
Reexamination Certificate
2011-01-18
2011-01-18
Rodriguez, Armando (Department: 2828)
Coherent light generators
Particular beam control device
Mode locking
C372S025000, C372S029010, C372S038020, C372S096000, C372S102000
Reexamination Certificate
active
07873079
ABSTRACT:
A CS optical pulse train generation method, which is able to change the half width of an optical pulse constituting a CS optical pulse train, and which is compact and has low power consumption. A distributed Bragg reflector semiconductor laser utilized in this method is one which is constituted comprising an optical modulation region, a gain region, a phase control region, and a distributed Bragg reflector region. Current is injected into the gain region by way of a p-side electrode and a n-side common electrode by a constant current source, forming the population inversion required for laser oscillation. Optical modulation required to manifest mode locking is carried out in the optical modulation region. A diffraction grating is formed in the distributed Bragg reflector region. A CS optical pulse train with a repetitive frequency of frepis generated by adjusting the effective indices of both the phase control region and the distributed Bragg reflector region such that, of the longitudinal modes of the mode-locked semiconductor laser diode, the two longitudinal modes close to the frequency f0, which is the Bragg wavelength of the distributed Bragg reflector region converted to a frequency, become f0+(frep/2) and f0−(frep/2).
REFERENCES:
patent: 4726031 (1988-02-01), Wakao et al.
patent: 5450428 (1995-09-01), Maeda
patent: 6031851 (2000-02-01), Shimizu et al.
patent: 6865348 (2005-03-01), Miyamoto et al.
patent: 2002/0048300 (2002-04-01), Tsukiji et al.
patent: 2004/0213317 (2004-10-01), Hashimoto et al.
patent: 2006/0045145 (2006-03-01), Arahira
patent: 2006/0209911 (2006-09-01), Takabayashi
A. Hirano, et al., “A novel mode-splitting detection scheme in 43-Gb/s CS- and DCS-RZ signal transmission,” IEEE J. Lightwave Technology, vol. 20, No. 12, pp. 2029-2034, Dec. 2002, Discussed on pp. 4-6, 60 & 65 of the present application.
K. Sato, et al., “Dual mode operation of semiconductor mode-locked lasers for anti-phase pulse generation,” Technical Digest of OFC 2000, paper ThW3-1, 2000, Discussed on pp. 8, & 55 of the present application.
H. Murai, et al., “EA modulator-based optical multiplexing/demultiplexing techniques for 160 Gbit/s OTDM signal transmission,” IEICE Trans. Electron., vol. E88-C, No. 3, pp. 309-318, Mar. 2005, Discussed on pp. 9-10 of the present application.
S. Arahira and Y. Ogawa, “40 GHz actively mode-locked distributed Bragg reflector laser diode module with an impedance-matching circuit for efficient RF signal injection,” Jpn. J. Appl. Phys., vol. 43, No. 4B, pp. 1960-1964, 2004, Discussed on p. 60 of the present application.
“Semiconductor Lasers and Photonic Integrated Circuits” edited by Yasuharu Suematsu, first edition, Ohmsha, Ltd., published Apr. 25, 1984, Discussed on p. 70 of the present application.
Nguyen Phillip
OKI Electric Industry Co., Ltd.
Rabin & Berdo P.C.
Rodriguez Armando
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