-
公开(公告)号：JP2001102680A
公开(公告)日：2001-04-13
申请号：JP26622999
申请日：1999-09-20
Applicant: LUCENT TECHNOLOGIES INC
Inventor： IWAMOTO TAKASHI , CHIN HON , HOSEIN SAINURU , KOJIMA KEISUKE , OTA YUSUKE , BERNARDUS JOHANNES HENDRICK KU
IPC: H01S5/062
Abstract: PROBLEM TO BE SOLVED: To realize a laser module with the use of an existing optical sending circuit for optical communication apparatus using low oscillation threshold lasers, and improve the optical output characteristics at no signal or zero signal time. SOLUTION: A laser oscillation threshold adjusting circuit, having an laser module and an optical transmission circuit in an optical transmission module used for optical communication apparatus, is provided. To adapt a low oscillation threshold laser module 10 to an optical transmission circuit 20 for high oscillation threshold lasers, a resistor 30 is added to connect the anode and cathode of the laser module, and the resistance of the resistor 30 is determined by taking the difference current of a threshold to be raised and the voltage drop between the laser anode and the cathode into consideration.
-
公开(公告)号：JP2001021591A
公开(公告)日：2001-01-26
申请号：JP2000178070
申请日：2000-06-14
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE
IPC: G01R19/04
Abstract: PROBLEM TO BE SOLVED: To prevent the decrease in a time in which a capacitor accurately stores a peak value by injecting a current substantially duplicating a leak current from the capacitor. SOLUTION: When there is a long reception period of only a single value in a receiving signal, a leak current is injected to a capacitor Cpk to substantially accurately guarantee the current leaked from a peak detector capacitor Cpk. Practically, a transistor TR4' is connected to a power supply CR2' similarly to a case connecting a transistor TR4 to a power supply CS2. The transistor TR4' is substantially same as TR4 and the power supply CS2' is substantially same as the power supply CS2 so that there is a substantially same leak current to TR4' base as the leak current from the capacitor Cpk to TR4 base. As a result, the leak current to TR4' base is accurately duplicated in TM collector, or an output of a current mirror.
-
公开(公告)号：JPH10303829A
公开(公告)日：1998-11-13
申请号：JP6344998
申请日：1998-03-13
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE
Abstract: PROBLEM TO BE SOLVED: To prevent the occurrence of the pre-amplifier noises of a DC coupling burst mode receiver of the conventional technology by applying the DC coupling between a main pre-amplifier of an optical burst mode receiver and a compactor by tracking the changes of the supply voltage, the temperature, etc., that affect the main pre-amplifier by means of a tracing pre-amplifier having the same constitution as the main pre-amplifier. SOLUTION: The DC levels caused by the signals supplied to a single input of an operational amplifier 1-5 from a main pre-amplifier 103 must be accurately matched with each other by another input of the pre-amplifier 103 in order to detect the accurate value of the optical signal that is electrically converted. A tracking pre-amplifier 107 which is substantially equal to the pre-amplifier 103 is monolithically provided on the same integrated circuit as the pre-amplifier 103 in order to attain the said matching of DC levels. As a result, the doubling of pre-amplifier noises of a DC coupling optical receiver can be eliminated in the digital optical communication where the burst mode transmission is performed.
-
4.发明专利
公开(公告)号：JPH1174623A
公开(公告)日：1999-03-16
申请号：JP17043498
申请日：1998-06-18
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE
IPC: H04B10/04 , H01S5/00 , H01S5/042 , H03K17/041 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/43 , H01S3/18 , H04B10/28
Abstract: PROBLEM TO BE SOLVED: To reduce or substantially remove the tail length (duration) by short- circuiting the terminals of a laser diode drive circuit provided in an energy discharge path and activated upon finishing packet communication. SOLUTION: A laser diode 205 is activated when a gate signal S has a high level and an n-MOS transistor 201 is turned off. Upon finishing packet communication, a 'LOW' pulse is applied to the gate 311 of a p-MOS transistor 307 in response to variation of a transmission packet signal existing in a high speed passive optical network system. Upon receiving that pulse, the p-MOS transistor 307 is turned to be conductive state, i.e., on-state, and the n-MOS transistor 201 is turned off. Consequently, the terminals of the laser diode 205 are short- circuited to form an energy discharge path for the laser diode and the length of laser emission tail is shortened.
-
公开(公告)号：JPH1022916A
公开(公告)日：1998-01-23
申请号：JP6758697
申请日：1997-03-21
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE , SWARTZ ROBERT GERALD
Abstract: PROBLEM TO BE SOLVED: To remove interference by means of the low frequency component of a video signal in the reception of a digital signal with simple constitution by controlling the voltage control current source of a burst mode receiver having non-linear dc cancel performance in a video passive light network. SOLUTION: When input light current Iin contains low frequency current I0 in the receiver 250, the levels of + and - become asymmetrical and the difference Δ of peaks becomes the output of the buffer B. The voltage control current source Cs is controlled by a signal supplied to a low-pass filter LPFB2 and is filtered. Then, the low frequency component Io is canceled from input light current Iin . Only the current Id of the digital signal is supplied to an amplifier A3 and a video signal component can be removed and interference by the video signal can be removed.
-
Patent Agency Ranking
公开(公告)号：JP2000196537A
公开(公告)日：2000-07-14
申请号：JP36550999
申请日：1999-12-22
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE
Abstract: PROBLEM TO BE SOLVED: To reduce crosswalks in 2-way multiplex optical communication. SOLUTION: In the optical communication method that uses light for a wavelength multiplex optical communication arrangement to conduct 2-way communication, a laser diode light source 107 generates light capable of carrying information for the communication via an optical fiber 105 with a 1st wavelength (e.g. 1.31 μm), light with a 2nd wavelength (e.g. 1.55 μm) that does not substantially include the light generated by the light source and carries the information is received from the optical fiber, and a band pass optical diode receiver 111 that has its sensitivity only for the light with the 2nd wavelength substantially but has substantially no sensitivity for the light with the 1st wavelength is used to convert the light with the 2nd wavelength into an electric signal. The light with the 1st wavelength from the light source is coupled with the optical fiber via a dichroic wavelength division multiplex splitter 109 and the light with the 2nd wavelength received from the optical fiber is coupled with a light receiving device via the wavelength division multiplex splitter.
-
公开(公告)号：JP2000059316A
公开(公告)日：2000-02-25
申请号：JP19132799
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE , EDERD SACKINGER
Abstract: PROBLEM TO BE SOLVED: To provide a circuit and a method to control power of a laser. SOLUTION: The power of a laser can be controlled by (1) storage of a current generated by a photodiode 117 in response to an optical signal generated by the laser, (2) subtraction of a preset threshold current in response to a data signal used to drive the laser from the current, (3) comparison of the prescribed storage with the prescribed subtraction before starting the storage and the subtraction. A driver 119 of the laser is controlled by using the result of this comparison (filter processing may be executed).
-
公开(公告)号：JP2001094540A
公开(公告)日：2001-04-06
申请号：JP2000243623
申请日：2000-08-11
Applicant: LUCENT TECHNOLOGIES INC
Inventor： DUNLOP ALFRED EARL , FISCHER WILHELM C , OTA YUSUKE
Abstract: PROBLEM TO BE SOLVED: To obtain a specific frequency again from a burst mode signal by using one signal device. SOLUTION: A clock can be collected from a burst mode signal having a specific frequency by using one device which is similar to American patents No.5, 237, and 290 except that a delay line used in each oscillator with a gate is selected in a controllable state so that oscillators with gates can provide clock signals having multiple frequencies. The same frequency is normally selected for both oscillators with gates. An oscillator with an internal gate is composed of a delay element. Relative frequencies are determined by the ratio of the number of delay elements in various oscillators with internal gates. When a delay element constituting an oscillator with an internal gate is an inverter, a phase splitter is usable so as to obtain secure oscillation even when the number of delay elements is always odd and two ratios are necessary with restored frequencies.
-
公开(公告)号：JP2000200942A
公开(公告)日：2000-07-18
申请号：JP19132699
申请日：1999-07-06
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE , EDERD SACKINGER
IPC: H01S5/0683 , H01S5/068 , H04B10/04 , H04B10/06 , H04B10/08 , H04B10/14 , H04B10/158
Abstract: PROBLEM TO BE SOLVED: To enable control of a laser and detection of a service life of a laser in a burst signal format by setting a first threshold at a value for executing power control and a second threshold at a value for detecting the service life of a laser. SOLUTION: A threshold depends on desired operation to be executed, when a corresponding threshold source is selected. For example, when it is used for controlling the power of a threshold source 107-1, the threshold source 107-1 is set at a current level generated by an optical diode 117, when a laser 115 supplies a desired power level. Similarly, when it is used for executing detection of a service life, a threshold source 107-2 is set at a current level generated by the optical diode 117, when the laser 115 attains near a final period of an effective life designated by a user. Another threshold source 107-N is used, for example, for issuing an alarm on laser service life at an early stage to a user.
-
公开(公告)号：DE69800817T2
公开(公告)日：2001-12-06
申请号：DE69800817
申请日：1998-03-03
Applicant: LUCENT TECHNOLOGIES INC
Inventor： OTA YUSUKE
Abstract: A DC coupled burst mode optical receiver circuit having improved sensitivity and improved dynamic range. The output of the receiver's photodiode is single endedly amplified by a main preamplifier and the main preamplifier's output is then converted, using an operational amplifier, e.g., with a gain of 1, to a differential signal which swings symmetrically around a threshold level. More specifically, the output of the main preamplifier is connected to one input of the operational amplifier. The output of a tracking preamplifier, which is identical to the main preamplifier, is coupled to the other input of the operational amplifier. The output of the tracking preamplifier is used to match the DC voltage of the main preamplifier, e.g., by being noise-free and by tracking changes in supply voltage, temperature, and the like. It is used to set the DC reference voltage for the standard operational amplifier functions. Between one output of the operational amplifier and the opposite sign input thereof is connected an automatic threshold controller (ATC). The ATC insures that the threshold level for determining the value of the logic value of the received signal is at the middle of the signal supplied from the main preamplifier. Preferably, the main preamplifier, the tracking preamplifier, the operational amplifier and the ATC are manufactured on a single integrated circuit. Optionally, a transimpedance resistor of both the main preamplifier and the tracking preamplifier are clamped to a predetermined maximum level, e.g., using a high-speed Schottkey diode, to enhance the dynamic range of the receiver.
-
-
-
-
-
-
-
-
-
Search Results
14
records
(took 0.025 seconds)
