The expert is working in the research center of green laser pointer

The exhibition of green laser pointer also draws attention of the manufacturer. It is reported that the structure of the 1554.7-1574.7nm wavelength range, to achieve a channel spacing of 50GHz, 52-channel multi-wavelength DWDM source and channel the difference between the maximum optical power is less than 0.3dB, the extinction ratio of 32dB, output The width of 500MHz. Classical Sagnac interferometer device in the field of information science and technology in ultra-fast response to a variety of applications, including: ultra-fast optical modulator of the all-optical switching, all-optical demultiplexing, signal regeneration, logical operations, signal format conversion, and all optical wavelength conversion and so on. Recently, OFC'2002 literature of a Sagnac interferometer device will broaden the application of the device [12]. Reported in the literature of the multi-wavelength Raman-based NOLM light, in the fourth-order Stokes Shiba, the wavelength channel can output 20. The manager complains that the investment in development of green laser pointer is not enough.
In OFC'2002 of another paper, we report a Raman pump using polarization multiplexing source, FP tunable filters and polarization dispersion compensation to the composition of multi-wavelength Raman fiber ring laser cavity. By 1428.2,1445.8,1463.4 nm pump wavelength Raman pump source role, 3dB bandwidth of the output wavelength range up to 58, the channel spacing of 50GHz. Currently associated with the AWG meeting reports have pointed out that the current output of up to 400 channels, each channel spacing 25GHz (wavelength interval of 0.4nm), the output wavelength can cover the entire C-band and L-band. However, the wavelength channel spacing of these are fixed, can not be changed. The output of the current development of multi-wavelength signal, the channel spacing is certain. OFC2001 meeting reported a tunable wavelength spacing multi-wavelength fiber laser output. The principle is shown in Figure 9. Faraday rotating mirror (FRM) to compensate for the FRM and polarization beam splitter (PBS) between the PMD, and stable before and after the transfer direction of orthogonal polarization states. The use of polarization in the polarization mode coupling as a tunable wavelength spacing filters. Fiber laser cavity polarization and polarization maintaining beam splitter and associated components form the wavelength filter. The expert is working in the research center of green laser pointer .
When the PMF does not exert pressure, along the fast axis polarization component of light through the filter, transmission and wavelength independent; when pressure is applied to the PMF, the pressure at, polarization mode coupling produces a wavelength interval of pressure on the location of different and different. Pressure is to use a Clip PMF of different locations. For example, in the PMF 4m at the pressure can get 9 channels output, wavelength tuning range of the 1548.2nm-1559.9nm, the wavelength spacing of 1.46nm. Drift within the 6dB peak power. When the pressure at the 8m at the location of the fiber laser output wavelength 14 channel wavelength spacing of 0.73nm. [15] proposed an alternative tunable control program shown in Figure 10 (a) shows the main characteristics of the wavelength interval is adjustable. With a peak figure of n different wavelengths grating (FBG) in Figure 10 (b) is installed into the FBG array structure and cascaded to form a multi-wavelength lasing. Wavelength tuning by changing the grating period to achieve. The expert group of 200mw laser pointer is very powerful in technology.
Made using four FBG FBG array, the initial work in 1547.64,1549.21,1551.36,1554.1 nm wavelength case, the tunable wavelength spacing to get four different wavelengths, respectively, 1547.64, 1551.64,1556.60,1561.24 nm. Continuous spectrum of ultra-short light pulse in TDM / WDM system has an important significance. Ultrashort optical pulses can not only improve the TMD system in single-channel bit rate, while its large continuous spectrum can also be provided for the WDM system many wavelength channels. Most of the supercontinuum generated mainly in the following two methods: compression of ultrashort optical pulses obtained using broadband spectrum and nonlinear devices pulse broadening of the spectrum. The most popular is also the most reported use or non-linear optical amplifiers Supercontinuum Generation. Which produces a wide continuous spectrum using the most economical and practical. According to reports, using different types, resulting in a continuous spectrum bandwidth is also different. For example, in two thick in the middle of the special drawing fine (see Figure 11) [16], resulting in the continuous spectrum is very wide tunable wavelength range of 500nm - 1600nm. Long as the pump source 3cm, pull the small length of 15cm, pigtail output of 15cm. The quality enhancement of green laser pointer is the main topic of today’s meeting.
After the continuous spectrum in the output section of the standard telecommunications Raman pulses tunable wavelength range of 200nm, Raman pulse wavelength tuning range of 1400nm - 1600nm. Pulse spectral bandwidth of 20nm, the equivalent width 130fs pulse sideband limit. When changing the input incident power, the Raman soliton wavelength is changed. This device is to change the pump power to change the wavelength. Multi-wavelength tunable mode-locked device technology has been very active area of research. OFC'2001 and OFC'2002 reported in many papers such device technology [17] [18]. LI et al reported the use of dispersion compensation (DCF) to increase the cavity dispersion, in actively mode-locked loop device to achieve a three-wavelength output, and by adjusting the modulation frequency, to achieve a single wavelength and dual wavelength continuous tuning. The technology improvement of green laser pointer will be recorded in the report.