-
公开(公告)号：JP2001311973A
公开(公告)日：2001-11-09
申请号：JP2001056619
申请日：2001-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ACKERMAN DAVID ALAN , BACHER KENNETH L , DAUTREMONT-SMITH WILLIAM C , DU MEI , ROTTWITT KARSTEN , STENTZ ANDREW J , STRASSER THOMAS ANDREW , ZHANG LIMING
Abstract: PROBLEM TO BE SOLVED: To provide a co-propagating Raman amplifying system which provides a sufficient on-off gain without causing pump signal crosstalk and signal pump signal crosstalk at unwanted level, and makes the device useful. SOLUTION: A fiber Raman amplifier is configured to use a co-propagating Raman pumping source, and this is advantageous in various system configurations. One example is a bi-directional communication system. A sufficient optical gain can be obtained with the co-propagating system by carefully configuring pumping source characteristics. These characteristics include the points such as (1) to use at least 50mW optical pump power, (2) to have a relatively large spectrum bandwidth in the pump for suppressing SBS, (3) a frequency difference among all the vertical pump modes of each pump laser is separated by at least a walk-off frequency between a pump laser frequency and a signal frequency, and all the strong vertical modes among individual pump laser are separated by at least an electric frequency bandwidth of a communication system.
-
公开(公告)号：JP2001305356A
公开(公告)日：2001-10-31
申请号：JP2001056618
申请日：2001-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： HALE ARTURO , STRASSER THOMAS ANDREW , WESTBROOK PAUL STEPHEN
Abstract: PROBLEM TO BE SOLVED: To provide an improved fiber which eliminates clad mode loss in a fiber Bragg grating. SOLUTION: An optical fiber Bragg grating of this invention has a glass optical fiber of a certain length with a core, a Bragg grating formed along the core, a glass cladding layer and a polymer coating which covers the cladding layer and has a refractive index matched with that of the cladding layer. By this matching, clad mode loss can be reduced to 1/4 of the current level, The preferred material of the coating is fluorinated urethane acrylate.
-
公开(公告)号：JP2001290035A
公开(公告)日：2001-10-19
申请号：JP2001057528
申请日：2001-03-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： BURDGE GEOFFREY L , EGGLETON BENJAMIN JOHN , STRASSER THOMAS ANDREW , WESTBROOK PAUL STEPHEN , WINDELER ROBERT SCOTT
Abstract: PROBLEM TO BE SOLVED: To provide an optical fiber Bragg diffraction grating provided with a ring consisting of gap regions (gaps) extending in a longitudinal direction apart spacings around a core in order to lessen short-wavelength cladding mode loss. SOLUTION: This invention is based on the finding that the internal gap claddings formed to necessary dimensions apart the suitable spacings substantially lessen the short-wavelength cladding mode loss in the fiber Bragg diffraction grating. The fiber Bragg diffraction grating is provided with the ring consisting of the gap regions extending in the longitudinal direction apart the proximate spacings in the glass enclosing the periphery of the core. The gaps are formed to the spacings parted by thin glass webs having a thickness below the wavelength of the light to be transmitted and are arranged around the core at distances of 1 to 10 wavelengths from the center of the core. The thin webs limit the passage of the light between the gaps. The combinations of the webs and the gaps act as the internal thin claddings to support the cladding mode fewer than the conventional glass claddings and considerably provide the increase of the wavelength intervals between the Bragg resonance and the first cladding mode resonance.
-
公开(公告)号：JP2000244394A
公开(公告)日：2000-09-08
申请号：JP2000040395
申请日：2000-02-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： EGGLETON BENJAMIN JOHN , NIELSEN TORBEN N , ROGERS JOHN A , STRASSER THOMAS ANDREW , WALKER KENNETH LEE
Abstract: PROBLEM TO BE SOLVED: To optimize the performance of an optical communication system by providing a data maintenance monitor, and adjusting dispersion elements so that the performance of this system is optimized, and deciding the distribution of grating according to the strength of added currents, detecting the maintenance of transmitted data and controlling the currents to be added to the grating. SOLUTION: Each automatic distribution compensating module 20 is provided with a variable distribution compensator 30, a data maintenance monitor 31 and a feedback network 32, and the monitor 31 adjusts the distribution compensator 30 through the feedback network 32 so that the performance of this system is optimized. Part of a signal on a transmission fiber path 11 is sampled, for example, by a tap 34, and this signals is analyzed so that the scale of the maintenance of the transmitted data can be obtained, and a feedback signal for controlling a variable distribution compensation grating 33 can be obtained from this scale. In the variable distribution compensator 30, a signal light from the transmission fiber 11 is directed to the variable distribution compensation grating 33.
-
公开(公告)号：JP2000244040A
公开(公告)日：2000-09-08
申请号：JP2000035783
申请日：2000-02-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ESPINDOLA ROLANDO PATRICIO , STRASSER THOMAS ANDREW , WESTBROOK PAUL STEPHEN , WYSOCKI PAUL FRANCIS
Abstract: PROBLEM TO BE SOLVED: To realize an improved performance comparable to that of a normal fiber amplifier by an arrangement wherein an optical fiber has a figure of merit higher than a specified value which is the integration in a specified wavelength range of the total wavelength loss of a filter means. SOLUTION: A plurality of L band fiber amplifiers (EDFA) 30 each having a C band removing filter in an Er doped fiber selected to attain an amplifier having a figure of a merit (FOM) higher than 400 dB.nm are arranged. The FOM is the integral of FL (λ) over the wavelength region of 1520-1565 nm and the FL (λ) is the total loss of λ by a C band removing filter at a length L of the Er doped fiber. Several C band removing filters 351, 352, 353 are arranged in the EDF. The upstream filter 351 is located at a specified distance L1 from the input end of the EDF, the filter 352 is located at a specified distance L2 from the filter 351 and the filter 353 is spaced apart by a specified distance L3 from the filter 352.
-
Patent Agency Ranking16.发明专利
公开(公告)号：JP2000221339A
公开(公告)日：2000-08-11
申请号：JP2000016436
申请日：2000-01-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ADAMS LAURA ELLEN , EGGLETON BENJAMIN JOHN , ROLAND PATRICIO ESPINDRA , JIN SUNGHO , MAVOORI HAREESH , ROGERS JOHN A , STRASSER THOMAS ANDREW
Abstract: PROBLEM TO BE SOLVED: To make it possible to produce a grating device having a wide band width, freely regulatable dispersibility and amplitude responsiveness by adding an extrinsic gradient to a waveguide and changing the range of the chirp in an intrinsic chirp type grating region. SOLUTION: The grating device 10 is manufactured by providing the device with the waveguide of a certain length like an optical fiber 11 having a grating region 12 in the waveguide. The grating region 12 has nonuniformly parted fluctuation parts and reflects the intrinsic chirp type grating. When the extrinsic gradient or force is impressed to the waveguide, the range of the chirp changes. First and second magnetic elements 15a and 15b attracts or repels to or from each other to introduce an elastic strain to the optical fiber 11 of the grating region. A gradient forming main body 14 is mounted on the optical fiber 11. As a result, the device which can include the grating of a certain range and the wide band width may be formed by using low temperature and weak force. The regulation of the dispersibility and amplitude responsiveness of the grating is possible as well.
-
公开(公告)号：JP2000164955A
公开(公告)日：2000-06-16
申请号：JP33130199
申请日：1999-11-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ROLAND PATRICIO ESPINDRA , STRASSER THOMAS ANDREW , WAGENER JEFFERSON LYNN , WYSOCKI PAUL FRANCIS
Abstract: PROBLEM TO BE SOLVED: To obtain good temperature compensation in an optical amplifier of temperature-dependent rare-earth doped waveguide. SOLUTION: An optical amplifier 10 of temperature-dependent rare-earth doped waveguide (for example, EDFA erbium-doped fiber amplifier) is compensated by a temperature-dependent loss filter 14. The characteristics of the filter 14 as a temperature-dependent loss filter are designed such that gain characteristics are compensated in all active operation temperature range. The amplifier 10 includes an optical waveguide 11 for transmitting an optical signal, rare-earth doped amplifying regions 12A and 12B in the optical waveguide 11 for amplifying the transmitted optical signal, pumping sources 13a and 13B for carrying out the optical pumping of the amplifying regions 12A and 12B, and the temperature-dependent loss filter 14. In a typical design, EDFA is compensated to the fluctuation within 1 dB, at the temperature range from -40 to 85 deg.C in at least a spectral range of 20 nm. In an embodiment, the loss filter 14 includes a plurality of filters with the central wavelength shifts which differ according to the temperature.
-
18.发明专利
公开(公告)号：JP2000089055A
公开(公告)日：2000-03-31
申请号：JP24812799
申请日：1999-09-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： STRASSER THOMAS ANDREW , WAGENER JEFFERSON LYNN
Abstract: PROBLEM TO BE SOLVED: To obtain a product containing a dispersion compensating diffraction grating having low polarized light mode dispersion (an optical fiber communication system, for example). SOLUTION: The dispersion compensating chirp optical fiber Bragg diffraction grating is formed in a polarized light maintaining (PM) fiber having double difraction of at least 10-6, Preferably >=10-5. By using the PM fiber, the Polarized light mode dispersion, which typically cannot be avoided in the chirp Bragg diffraction grating 11 for dispersion compensation, can be essentially compensated.
-
公开(公告)号：DE60037052T2
公开(公告)日：2008-08-28
申请号：DE60037052
申请日：2000-01-19
Applicant: LUCENT TECHNOLOGIES INC
-
公开(公告)号：DE60120013T2
公开(公告)日：2006-11-30
申请号：DE60120013
申请日：2001-02-26
Applicant: LUCENT TECHNOLOGIES INC
Inventor： ERDOGAN TURAN , STRASSER THOMAS ANDREW , WESTBROOK PAUL STEPHEN
IPC: H04B10/135
Abstract: Polarization monitoring and control in a lightwave communication system is achieved by using an in-line polarimeter in conjunction with a polarization controller. The devices are readily compact, accurate and therefore capable of implementation in a variety of system applications. In one embodiment, a polarimeter and controller can be coupled together by a feedback loop between the polarimeter output and the controller input to provide "active polarization control" (APC).
-
-
-
-
-
-
-
-
-
Search Results
49
records
(took 0.025 seconds)
