CN201508182U

CN201508182U - Digital output PIN-FET optical receiver

Info

Publication number: CN201508182U
Application number: CN2009202169150U
Authority: CN
Inventors: 毛健; 王兵
Original assignee: Beijing Panwoo Integrated Optoelectronic Co Ltd
Current assignee: BEIJING PUDAN PHOTOELECTRIC TECHNOLOGY CO., LTD.
Priority date: 2009-09-25
Filing date: 2009-09-25
Publication date: 2010-06-16
Anticipated expiration: 2019-09-25

Abstract

The utility model discloses a digital output PIN-FET optical receiver, which comprises an optical signal input terminal, a PIN photoelectric diode and a front amplifier with an input end and an output end. One end of the PIN photoelectric diode is electrically connected with the optical signal input terminal, and the other end of the PIN photoelectric diode is electrically connected with the input end of the front amplifier. The receiver is characterized by further comprising an A/D conversion circuit and a metal shielding case, wherein the A/D conversion circuit is electrically connected with the output end of the front amplifier, and the optical signal input terminal, the PIN photoelectric diode, the front amplifier and the A/D conversion circuit are all arranged inside the metal shielding case. The receiver is capable of shielding an internal analog circuit, insulating external interferences, and leading analog signals to be converted into digital signals without distortion to be output, thereby greatly increasing anti-interference capacity, and greatly increasing precision of optical fiber gyroscope.

Description

Numeral output PIN-FET optical fiber receive module

Technical field

The utility model relates to Fibre Optical Sensor, fiber optic communication field, specially refers to a kind of numeral output PIN-FET optical fiber receive module.

Background technology

The PIN-FET optical fiber receive module is mainly used in optical fiber sensing systems such as optical fibre gyro, as the light signal receiving unit, plays the effect of opto-electronic conversion and amplifying signal.

The modern optical fiber gyroscope comprises two kinds of interfere type gyroscope and resonant mode gyroscopes, and they all are to get up according to the theoretical developments of Sai Genike.The main points of Sai Genike theory are: when light beam advances in the passage of an annular, if circular passage itself has a velocity of rotation, to advance the needed time more than rotating opposite direction along this passage and advance the needed time for the light direction of rotating along passage so.That is to say that when optical loop rotates on different working direction, the light path of optical loop all can change with respect to the light path of loop when static.Utilize the variation of this light path, if make to produce between the light that advances on the different directions and interfere the velocity of rotation of measuring loop, so just can produce interferometric fiber optic gyroscope, if utilize the variation of this loop light path to be implemented in the constantly interference between the round-robin light in the loop, just the resonance frequency of the light by adjusting optical fiber loop and then measure the velocity of rotation of loop just can produce the fibre optic gyroscope of resonant mode.

Please refer to Fig. 1, prior art PIN-FET optical fiber receive module is inner to be adopted the high linearity photoelectric detector chip and forms the preposition resistance amplifying circuit of striding by field effect transistor FET, microwave triode and other microwave component, with the light signal that receives, after PIN photodiode is carried out opto-electronic conversion, form prime amplifier by field effect transistor FET, microwave triode and other microwave component and carry out the signal amplification, electric signal after output is amplified at last has characteristics such as high-gain, high bandwidth, low noise.But the PIN-FET optical fiber receive module output signal that is widely used in optical fibre gyro at present is a simulating signal, is subject to the interference of other electronic circuit of optical fibre gyro, element and distortion causes signal to distort, and has a strong impact on the precision of optical fibre gyro.Outside electromagnetic interference (EMI) mainly contains that power supply noise disturbs, the PDM circuit is crosstalked, the RC circuit is crosstalked space electromagnetic interference (EMI) etc.

Summary of the invention

Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of to inner mimic channel shield, antijamming capability is strong, improves the numeral output PIN-FET optical fiber receive module of optical fibre gyro precision.

For solving the problems of the technologies described above, the numeral output PIN-FET optical fiber receive module that the utility model provides, comprise a light signal input end, one PIN photodiode, one has the prime amplifier of input end and output terminal, described PIN photodiode one end is electrically connected described light signal input end, the other end is electrically connected the input end of described prime amplifier, also have an A/D change-over circuit and a metallic shield, described A/D change-over circuit is electrically connected the output terminal of described prime amplifier, described light signal input end, PIN photodiode, prime amplifier, and the A/D change-over circuit all places in the described metallic shield.

Described A/D change-over circuit is 12 a bit serial output A/D conversion chip.

Described A/D change-over circuit is 8 a bit parallels output A/D conversion chip.

Good effect of the present utility model is: numeral output PIN-FET optical fiber receive module described in the utility model, by the A/D conversion chip being integrated in numeral output PIN-FET optical fiber receive module inside, utilize the all-metal encapsulation of numeral output PIN-FET optical fiber receive module, can shield inner mimic channel, isolate external interference, export after making simulating signal be converted to digital signal without distortion, antijamming capability significantly increases, and can obviously improve Gyro Precision.

Description of drawings

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Fig. 1 is a prior art PIN-FET optical fiber receive module theory diagram.

Fig. 2 is the utility model numeral output PIN-FET optical fiber receive module theory diagram.

Fig. 3 is the utility model numeral output PIN-FET optical fiber receive module AD12 bit serial output circuit schematic diagram.

Fig. 4 is the utility model numeral output PIN-FET optical fiber receive module AD8 bit parallel output circuit schematic diagram.

Embodiment

Below in conjunction with description of drawings embodiment of the present utility model.

As shown in Figure 2, the utility model numeral output PIN-FET optical fiber receive module, comprise light signal input end 1, PIN photodiode 2, prime amplifier 5 with input end 3 and output terminal 4, described PIN photodiode 2 one ends are electrically connected described light signal input end 1, the other end is electrically connected the input end 3 of described prime amplifier 5, also have an A/D change-over circuit 6 and a metallic shield 7, described A/D change-over circuit 6 is electrically connected the output terminal 4 of described prime amplifier 5, described light signal input end 1, PIN photodiode 2, prime amplifier 5, and A/D change-over circuit 6 all places in the described metallic shield 7.

Described A/D change-over circuit 6 is 12 bit serial output A/D conversion chips, as shown in Figure 3; Described A/D change-over circuit 6 can also be 8 a bit parallels output A/D conversion chip, as shown in Figure 4.

The utility model adopts 14pin dual inline type shell, all-metal encapsulation; inner integrated high linearity photoelectric detector chip, field effect transistor FET amplifying circuit, A/D conversion chip; adopt thick film hybrid integrated circuit technology, be with single mode or protect inclined to one side tail optical fiber coupling output.Wherein, photoelectric detector chip carries out opto-electronic conversion, and the little light signal that tail optical fiber is imported is converted to little current signal output; The little current signal that the FET amplifying circuit will be imported amplifies and is converted to voltage signal to be exported; The A/D conversion chip then is converted to digital electric signal output with the analog electrical signal of input.

Concrete processing step is as follows: cleanings, element paster, circuit board welding, spun gold pressure welding, coupling, preliminary survey, high temperature electricity wear out, middle survey, parallel seam welding, leak detection, temperature cycles, on-line testing, last survey, sealing cover, packing.

The specific embodiment of the above is intended to specify thinking of the present utility model, and the enforcement of the utility model is not limited to the disclosed mode of above specific embodiment.All mentalities of designing based on the utility model are simply deduced and are replaced, and all belong to the enforcement of the utility model.

Claims

1. a numeral is exported the PIN-FET optical fiber receive module, comprise a light signal input end (1), one PIN photodiode (2), one has the prime amplifier (5) of input end (3) and output terminal (4), described PIN photodiode (2) one ends are electrically connected described light signal input end (1), the other end is electrically connected the input end (3) of described prime amplifier (5), it is characterized in that: also have an A/D change-over circuit (6) and a metallic shield (7), described A/D change-over circuit (6) is electrically connected the output terminal (4) of described prime amplifier (5), described light signal input end (1), PIN photodiode (2), prime amplifier (5), and A/D change-over circuit (6) all places in the described metallic shield (7).

2. numeral output PIN-FET optical fiber receive module according to claim 1 is characterized in that: described A/D change-over circuit (6) is 12 a bit serial output A/D conversion chip.

3. numeral output PIN-FET optical fiber receive module according to claim 1 is characterized in that: described A/D change-over circuit (6) is 8 a bit parallels output A/D conversion chip.