公开(公告)号：JPH11195844A

公开(公告)日：1999-07-21

申请号：JP29795498

申请日：1998-10-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  TANBUN-EK TAWEE

IPC: H04B10/02 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/125 ,  H04B10/155 ,  H04B10/18 ,  H01S3/18

Abstract: PROBLEM TO BE SOLVED: To reduce signal distortion caused by fiber nonlinearity and dispersion by comprising a semiconductor laser which allows broad band tuning, comprising an integrated internal void synthesis reflector, and adding a tuning voltage and pre-chirp. SOLUTION: A semiconductor laser 10 which allows broad band tuning comprises a gain section 12 and an internal void synthesis reflector section 14 integrated with it, and a current is supplied to the gain section 12 by a current driver 16 for generating an output signal. A DC voltage applied to the synthesis reflector section 14 by a bias source 18 is used for rough-tuning the carrier frequency of the output signal through control of phase of optical field of the void in laser, in addition, output signal is connected to a fiber with a tendency wherein the signal is internally subjected to distortion caused by non-linearity and dispersion. Further, the reflector section 14 is supplied with a pre-chirp signal of relatively low frequency and low voltage, generating relatively small wavelength deviation around a carrier frequency.

公开(公告)号：JP2000047047A

公开(公告)日：2000-02-18

申请号：JP17040299

申请日：1999-06-17

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ALAM MUHAMMAD ASHRAFAL ,  HYBERTSEN MARK S ,  PEOPLE ROOSEVELT

IPC: G02B6/13 ,  G02B6/12 ,  G02B6/122 ,  H01L21/20 ,  H01S5/026 ,  H01S5/227

Abstract: PROBLEM TO BE SOLVED: To provide a process for forming a waveguide. SOLUTION: In this process, an optical waveguide is formed by depositing a compound semiconductor material on a substrate with chemical vapor deposition. At this time, since a dielectric mask affects the deposition rate of the compound semiconductor material on the substrate in its area in the vicinity of the mask, distribution of the waveguide to be formed with a mask having selected mask dimensions, is subjected to modeling and compared with a desired distribution. When the modeled distribution is not allowably similar to the desired distribution, the mask dimensions are corrected. Distribution of the waveguide to be formed with the corrected mask having corrected dimensions is again subjected to modeling and the modeled distribution is compared again with the desired distribution. This process is repeatedly performed until the modeled distribution becomes sufficiently similar to the desired distribution. After the mask dimensions are finally selected, a mask is formed on the substrate and a compound semiconductor waveguide is formed on the substrate by using selective area growth(SAG).

公开(公告)号：JPH11191649A

公开(公告)日：1999-07-13

申请号：JP29666498

申请日：1998-10-19

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  FANG WEI-CHIAO ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  SERGENT ARTHUR M ,  TANBUN-EK TAWEE ,  TSANG WON-TIEN

IPC: H01S3/10 ,  H01S5/0625 ,  H01S5/10

Abstract: PROBLEM TO BE SOLVED: To provide a broad band adjustable laser, which generates optical output signal corresponding such as to the wavelength of a wavelength division multiplexing (WDM) system, N-pieces of channels, with any one of the N-pieces of different axial modes. SOLUTION: An adjustable semiconductor laser has a gain region 12 having an MGW active region 12.1, grating DFB regions 12.2 of a uniform pitch and a first waveguide 12.3. A cavity resonance is formed of a composite reflecting region 14, which has a second MQW region 14.1 and a second waveguide 14.3, and the regions 12.2. Due to the voltage applied to this region 14, a quantum confining Stark effect is caused and as a result, the wavelength of the laser is changed.

公开(公告)号：JPH11243255A

公开(公告)日：1999-09-07

申请号：JP29795298

申请日：1998-10-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  TANBUN-EK TAWEE

IPC: H04J14/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/50 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J7/00 ,  H04J14/02

Abstract: PROBLEM TO BE SOLVED: To provide a wide-band, tunable semiconductor laser transmitter capable of realizing multiplexing of subcarriers. SOLUTION: A laser transmitter 10 makes routing a signal with three hierarchical levels. The signal route is discriminated on the basis of N number of wavelength division multiplexed(WDM) wavelength channels at a first level, m amplitude modulation(AM) subcarrier frequency channels at a second level, and n frequency modulation(FM) subcarrier frequency channels at a third level. Since an adjustment voltage is used to roughly adjust the wavelengths of N number of WDM channels, an FM dither signal is used to generate additional m number of channels via FM-SCM (subcarrier multiplexing). An AM dither signal is similarly used to generate additional n number of channels via AM- SCM.

公开(公告)号：JPH11195843A

公开(公告)日：1999-07-21

申请号：JP29795398

申请日：1998-10-20

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  ESKILDSEN LARS ERIK ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  TANBUN-EK TAWEE

IPC: H04B10/02 ,  H01S5/00 ,  H01S5/042 ,  H01S5/062 ,  H01S5/0625 ,  H01S5/125 ,  H04B10/18 ,  H04B10/43 ,  H01S3/18 ,  H04B10/28

Abstract: PROBLEM TO BE SOLVED: To reduce stimulus Brillouin scattering by, related to an optical fiber system, comprising an integral internal void synthesis reflector, to which tuning voltage and dither signal are added for tuning in broad band. SOLUTION: A semiconductor laser 10 which allows broad band tuning comprises a gain section 12 and an internal void synthesis reflector section 14, and a current driver 16 supplies a current to the gain section 12 for generating an output signal 20. A forward bias DC voltage is supplied to the synthesis reflector section 14 from a bias source 18 for controlling a phase of an optical field in the void inside laser, thus carrier frequency of an output signal is roughly adjusted. Further, the output signal is combined to a transfer medium having tendency to generating stimulus Brillouin scattering(SBS). In order for reducing the SBS, a dither signal of relatively low frequency and low voltage is further added to the synthesis reflector section 14. The spectrum of the output signal is widened for increased SBS threshold.

公开(公告)号：DE69810732T2

公开(公告)日：2003-09-11

申请号：DE69810732

申请日：1998-10-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  TANBUN-EK TAWEE

IPC: H04J14/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/50 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J7/00 ,  H04J14/02 ,  H04J14/04

Abstract: In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.

公开(公告)号：DE69810732D1

公开(公告)日：2003-02-20

申请号：DE69810732

申请日：1998-10-13

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ADAMS LAURA ELLEN ,  BETHEA CLYDE GEORGE ,  NYKOLAK GERALD ,  PEOPLE ROOSEVELT ,  TANBUN-EK TAWEE

IPC: H04J14/00 ,  H01S5/00 ,  H01S5/02 ,  H01S5/026 ,  H01S5/06 ,  H01S5/0625 ,  H01S5/12 ,  H01S5/50 ,  H04B10/04 ,  H04B10/06 ,  H04B10/142 ,  H04B10/152 ,  H04J7/00 ,  H04J14/02 ,  H04J14/04

Abstract: In a WDM fiber-optic network, a unique laser transmitter enables signals to be routed at three hierarchical levels: at one level discrimination among signal paths is based on N WDM wavelength channels, at another level discrimination is based on m AM subcarrier frequency channels, and at a third level discrimination is based on n FM subcarrier frequency channels. Thus, a total of Nmn distinguishable optical channels can be accommodated and a like number of users served. The laser transmitter comprises a broadband, tunable semiconductor laser which includes an intracavity, integrated composite reflector to which a tuning voltage and a FM dither signal are applied, an intracavity gain section to which drive current is applied, and an extracavity, integrated electroabsorption modulator to which an information (e.g., data, voice, video) signal and an AM dither signal are applied. The tuning voltage provides coarse wavelength tuning among N WDM channels, whereas the FM dither signal produces an additional m channels via FM-SCM. The AM dither likewise produces an additional n channels via AM-SCM.