38results about How to "High amplification gain" patented technology

An exposure apparatus has a laser device that is small, easy to maintain, and capable of producing an output that is unlikely to be affected by optical surges occurring in the beginning of operation. A single-wavelength laser oscillator (11) supplies a laser beam (LB1) to a fiber optic amplifier (13) through an optical modulator (12). The amplified laser beam is split by splitters (14, 16-1 to 16-m), amplified by optical amplifier units (18-1 to 18-n) and supplied through a fiber bundle (19) to a wavelength converter (20), which in turn converts the split beams into ultraviolet laser radiation (LB5) for use as exposure light. The optical modulator (12) outputs light pulses during the generation of ultraviolet light. The optical modulator (12) also produces laser radiation during the absence of ultraviolet light, but the laser radiation has substantially the same average output and a considerably low peak compared with that during the generation of ultraviolet light.

An instrument for fluorometric assays in liquid samples is disclosed. The instrument may include multiple optical channels for monitoring a first fluorophore associated with a target analyte and a second fluorophore associated with a control. The disclosed instrument finds utility in any number of applications, including microfluidic molecular biological assays based on PCR amplification of target nucleic acids and fluorometric assays in general.

The present invention provides, in at least one embodiment, a scheme which is effective in suppressing detrimental coherence effects such as random backscatter. In a fiber laser having a master oscillator power amplifier design, inserting a decorrelator in between the master oscillator and a first power amplifier or inserting a decorrelator in between the first power amplifier and a second power amplifier to reduce random backscatter, which allows for much more energy to be stored and higher gain without the risk of catastrophic optical damage, thus increasing the peak power that can be delivered as useful laser power. Backscattering can be further reduced by having the master oscillator depolarized, injection locked, and spectrally broadened to reduce the coherence length of the master oscillator.

A sense amplifier circuit includes a current sense amplifier, a voltage sense amplifier, and an output stabilizing circuit. The current sense amplifier amplifies differential input currents to generate differential output voltages and provides the differential output voltages to a sense amplifier output line pair. The voltage sense amplifier is coupled to the sense amplifier output line pair to amplify the differential output voltages on the sense amplifier output line pair. The voltage sense amplifier is activated at the time later than a time of activation of the current sense amplifier. The output stabilizing circuit is coupled to the sense amplifier output line pair to stabilize the differential output voltages on the sense amplifier output line pair. The output stabilizing circuit has a positive input resistance. Accordingly, the sense amplifier circuit reduces power consumption and an occupied area on a semiconductor chip.

The invention discloses a self-excitation eliminating method of a high gain public address system based on space counteracting. Voice signals of amplified frequency components are respectively weighted and then output from a two-path sound box loudspeaker so that two-path output signals mutually cancel out at a microphone. Thus, a microphone loop has extremely high amplification gain by a method of inhibiting the voice output from a sound box from being feeding back to the microphone. On one hand, the method leads the two-path self-excitation signals are voluntarily cancelled out, is dependent of objective signals and does not treat the object signals, and additional inhibition signals are not generated at the same time; and on the other hand, the method cause the signals resulting in squeal to be voluntarily eliminated rather than being filtered from the objective signals, thereby radically solving the self-excitation problem of the microphone.

The present invention relates to a difference Miller band-pass filter and a signal filtering method. The filter comprises an amplifier, a first N-channel feedback network, a second N-channel feedback network and two clock generators; the amplifier performs difference input signals and input matching through the resistance feedback to increase the voltage gain of the input signals for signal amplification, and performs difference output of the signals after filtering; the two clock generators generate periodic sampling pulse sequences and transmit the periodic sampling pulse sequences to the first N-channel feedback network and the second N-channel feedback network; and the first N-channel feedback network and the second N-channel feedback network weaken the signals out of the channels, perform center frequency regulation and conduction operation according to the sampling pulse sequences and perform filtering of the amplified signals. Compared to the prior art, the difference Miller band-pass filter and the signal filtering method can increase the signal gain, increase the 3dB bandwidth of a filter, effectively reduce the chip area and reduce the power consumption of the local oscillator branch.

The invention belongs to the field of semiconductor devices, and particularly relates to a high-sensitivity integrated semiconductor ultraviolet photoelectric detector. A reversely biased Schottky junction converts incident photons into photoelectrons. Generated photoelectrons are accumulated on an electrically suspended gate, the breakover current of a high-electron-mobility transistor is regulated and controlled, and therefore photo-induced electrons are amplified, and high detection sensitivity is achieved. Compared with a common independent ultraviolet photoelectric detector, the device provided by the invention has two advantages that a photoelectric signal is amplified by utilizing the high-electron-mobility transistor, so that the sensitivity is greatly improved; the ultraviolet photoelectric detection Schottky diode and the high-electron-mobility transistor are integrated on the same substrate, so that a multifunctional monolithic integration module can be formed, and the sizeand the cost of the system can be reduced.

The invention discloses an optical fiber hydrophone remote all-optical transmission system and a design method thereof. The optical fiber hydrophone remote all-optical transmission system comprises an optical fiber output assembly, an optical fiber hydrophone multiplexing array, a remote pump gain unit, a remote pump unit and a signal receiving demodulation assembly. The optical fiber output assembly is connected with the optical fiber hydrophone multiplexing array through an optical fiber L1, the remote pump unit is connected with the remote pump gain unit through an optical fiber L2, the optical fiber hydrophone multiplexing array is connected with the remote pump gain unit through an optical fiber L3, and the remote pump gain unit is connected with the signal receiving and demodulating assembly through an optical fiber L4. The optical fiber L1 and the optical fiber L2 are both G.654E single-mode optical fibers, and the optical fiber L3 and the optical fiber L4 are both UUL-G.652 single-mode optical fibers. The optical fiber hydrophone is applied to the field of optical fiber hydrophones, the nonlinear effect of downlink optical transmission can be reduced, the injection optical power is increased, the loss of uplink and downlink transmission links is reduced, the remote amplification gain and optical power redundancy are improved, and the phase noise of a remote transmission system is reduced.

An optical radiation adapted for use in Raman amplification in a given band, is generated from a low power optical radiation with a respective bandwidth, generated by a plurality of master oscillators, such as low-power laser diodes whose output radiation is multiplexed by a multiplexer. A Raman amplification medium is provided, such as a length of optical fiber, and an additional optical radiation adapted for use in Raman amplification in said Raman amplification medium is generated. Both the low-power optical radiation and the additional optical radiation are injected into the medium so to produce, by the Raman effect induced in the medium, the output optical radiation.

The invention relates to a Raman amplification device based on a lead sulfide doped quartz optical fiber. The Raman amplification device comprises a signal source, an optical isolator A, the lead sulfide doped quartz optical fiber, a wavelength division multiplexing coupler, a high-power pump laser, an optical isolator B, an optical power meter and the like. All parts of the device are connected through quartz optical fibers, the lead sulfide doped quartz optical fibers are prepared by combining an improved chemical vapor deposition method with a lead sulfide gasification process, the preparation process is simple, and the finished optical fibers are high in Raman intensity and Raman gain coefficient. The high-power pump laser provides pump light required by the amplifying device, and thepump light and the signal light generate Raman gain in the optical fiber, so that the transmitted signal light is amplified. The device is simple in structure, safe, stable and good in amplification effect, and the cost is further reduced.

The invention discloses a trans-impedance amplifier, which comprises an amplifier and a voltage-controlled resistor connected with the amplifier, and the gain control circuit is connected with the voltage-controlled resistor and is used for controlling the voltage at the two ends of the voltage-controlled resistor to be gradually reduced along with time extension, and the amplification gain of the amplifier is gradually increased along with time extension. The device provided by the invention has the characteristics of low gain and wide range in strong echo optical current signal detection of a short-distance target (short echo time), and has the characteristics of high gain and small range in weak echo optical current signal detection of a long-distance target (long echo time); the problem that an existing logarithmic amplifier is large in noise under weak signal echoes, and consequently the signal-to-noise ratio of a system is insufficient can be solved, and the index requirements of a large dynamic range and low noise in a laser radar receiver are met.