The invention discloses an unequal-bandwidth optical comb filter. The unequal-bandwidth optical comb filter comprises an optical splitter, a first three-mirror GT cavity, a second three-mirror GT cavity, a glass compensating plate, a first collimator and a second collimator. According to the unequal-bandwidth optical comb filter, optical path difference is adjusted by selecting the appropriate glass compensating plate, and then high efficiency and low cost are realized.

Unequal-bandwidth optical comb filter

A filter and manufacturing method thereof, and a laser wavelength monitoring device, the filter comprising: two translucent bodies, each having a first plane, a second plane forming a wedge angle with the first plane, and a third plane intersecting with both the first plane and the second plane, the first planes of the two translucent bodies being mutually parallel, and the second planes of the two translucent bodies being mutually parallel; a light beam splitting film having both surfaces respectively combined with the first planes of the two translucent bodies; and two groups of reflective film series respectively combined with the second planes of the two translucent bodies. The laser wavelength monitoring device has a greatly shortened wavelength monitoring optical path compared with the prior art, has a small footprint, and can realize miniaturized encapsulation, thus significantly reducing product encapsulation cost, and having high monitoring precision.

Filter and manufacturing method thereof, and laser wavelength monitoring device

A filter includes two translucent bodies. Each of the translucent bodies has a first plane, a second plane that forms a wedge angle with the first plane, and a third plane that intersects with both the first plane and the second plane, first planes of the two translucent bodies are parallel to each other, and second planes of the two translucent bodies are parallel to each other. The filter also comprises a beam splitting film, where surfaces of both sides are respectively combined with the first planes of the two translucent bodies. Two reflective films are combined, respectively, with the second planes of the two translucent bodies.

Filter, Method for Producing Filter, and Laser Wavelength Monitoring Apparatus

The invention discloses an optical filter adopting bandwidth compression. The optical filter comprises a light input unit (1-1), a light splitting unit (1-2) and a reflecting unit (1-3), wherein a plurality of channels are formed in the light input unit (1-1), the light splitting unit (1-2) is located between the light input unit (1-1) and the reflecting unit (1-3), and the reflecting unit (1-3) and the channels of the light input unit (1-1) are arranged in an optical coupling manner; the channels of the light input unit (1-1) are distributed in a central symmetric manner and are in cascading connection, each pair of symmetrical channels is located in two-dimensional space and allows light incoming and outgoing for one time, and each outgoing channel is connected with the next incoming channel in sequence until the last pair of channels. With the adoption of the two-dimension central symmetric structure, the coupling error of the channels is reduced to the minimum, insertion loss after repeated cascading connection can be approximately taken as repeated accumulation of central elements, the multiplexing influence of an input end is low, and great compression of a bandwidth index is realized.

Optical filter adopting bandwidth compression

The invention discloses a method for manufacturing an optical fiber filter with improved reflection isolation. The method successively includes the following steps of assembling an optical filter assembly including an optical filter element together with a focus collimation assembly in a sleeve tube to form a first assembly, and inserting a first optical fiber head assembly provided with a first optical fiber into the sleeve tube and performing optical path adjustment with the first assembly so that the portion of the incident light from the first optical fiber reflected by the optical filtercomponent is emitted from the first optical fiber. The method solves the problem of low reflection isolation in the prior art. When the method is used, incident lights with different spectrums are separated by the optical filter assembly and the optical fiber head assembly, and light with a wide spectrum, high reflectance and high reflection isolation is reflected back to the incident optical fiber to provide the desired detection signal for an OTDR.

Method for manufacturing optical fiber filter with improved reflection isolation

The utility model belongs to an optical group filter for optical fiber communication, which comprises an optical splitter 2 and a collimator 9. Two cascade connection F-P resonant cavities composed of two groups of reflectors can generate the Michelson interference. The bandwidth is fully used for reducing the channel spacing. The utility model has the advantages of less distortion, good consistency, flat bandwidth and high isolation. The bandwidth can be selected according to needs of channel spacing. When the spacing of input light signals of multiple wavelength is 50GHz, the output to the spacing of two channels is 100GHz. One path of bandwidth is 60GHz, and the transmission rate is 40Gb/s. The other path of bandwidth is 40GHz, and the transmission rate is 10Gb/s. The channel with the bandwidth of 100GHz realizes the average rate of transmission of 50Gb/s; compared with the background technology, the average rate of transmission is improved by 10Gb/s. The utility model is used for a wavelength division multiplex system, an optical up/down path multiplexer, the intersecting interconnection of optics, and optical wave filtration in optical communication.

Optical group set filter

The optical group filter used in optical fiber communication comprises the light splitter, two collimators 2 and 9 and F-P resonant cavity. The F-P cavity composed of two groups of reflectors generates Michelson interference. The invented filter takes full advantage of band width and reduces the channel spacing, providing the features of small distortion, good consistency, wide flat bandwidth andhigh isolation. Based on the need of channel spacing, the bandwidth is selected. When the optical signal interval of multiple wavelengths inputted is 50 GHz, the output of the 100 GHz of two-channel spacing is realized with one channel 60GHz bandwidth, transmission rate 40Gb/s and the other channel 40 GHz bandwidth, transmission rate 10 Gb/s. The average transmission rate is 50 Gb/s at 100 GHz bandwidth.

Optical group filter

The utility model relates to an optical comb type filter, which comprises a collimator, a light splitter and reflectors (2, 3, 4, 5 and 6) The output end face of the collimator is arranged near the light splitter with a definite angle The reflector (2) is arranged on the reflected light side of the light splitter, and a normal line of the reflector (2) forms a definite angle with the light splitter The reflector (3) is arranged on the back side of the reflector (2), and a normal line of the reflector (3) is parallel to the normal line of the reflector (2) The reflector (4) is arranged on the back side of the reflector (3), and a normal line of the reflector (4) is parallel to the normal line of the reflector (3) The reflector (5) is arranged on the transmitted light side of the light splitter; the reflector (5) is mutually arranged corresponding to the collimator by the light splitter; a normal line of the reflector (5) forms a definite angle with the light splitter The reflector (6) is arranged on the back side of the reflector (5), and a normal line of the reflector (6) is parallel to the normal line of the reflector (5) The collimator is arranged on the other side of the light splitter, and a normal line of the collimator forms a definite angle with the light splitter

Optical comb type filter

The general equations of transmission spectrum, reflection spectrum, and phase of a multi-minor F-P interferometer are derived. In view of the theory of Fabry-Perot interferometer tuning phase, a one-cavity F-P dispersion compensator is designed, and chromatic dispersion property of it is analyzed. Furthermore, the best designing parameters are obtained, and an improving scheme, which is practical and effective, is put forward.

Design of Gires-Tournois resonator dispersion compensator

A novel Interleaver using a modified Michelson interferometer in which its reflecting mirrors are replaced by three-mirror Fabry-Perot interferometer and Gires-Tournois resonator respectively is presented. On basis of the theory of Michelson interference, a designing principle of the interleaver, which has square-like frequency response with zero ripple, wide flat-top, unity contrast, simple structure, and stable performance, is given. The device which possesses channel spacing of 50GHz, zero ripple, 0.5dB bandwidth more than O.27nm, and close channel isolation more than 73dB has been designed.

Qian Longsheng

Papers

Optical group set filter

Optical group filter

Optical comb type filter

Design of Gires-Tournois resonator dispersion compensator

Novel interleaver based on modified Michelson interferometer with three-mirror Fabry-Perot interferometer and Gires-Tournois resonator