YC/T 246-2008Tobacco and tobacco products. Determination of nicotine. Gas chromatographic method (English PDF)

3.1 Port

An optical signal input or output port belonging to an optical passive device.

3.2 Optical fiber branching devices

It refers to the optical passive device which is used to realize the optical signal

coupling and re-distribution between two or more optical fibers.

3.3 Optical fiber coupler

It is also known as "non-wavelength selective optical branching device", which

is an optical fiber device used to realize the power coupling and re-distribution

functions of the optical signal of certain band.

3.4 Optical fiber wavelength division multiplexing coupler

It is also known as "wavelength selective optical branching device", which is

used to realize the multiplexing and demultiplexing function of two optical

signals of different wavelengths.

3.5 Working bandwidth

It refers to the optical wavelength range to which the optical performance

indicators of the devices as specified in this standard are applicable,

expressed in nm.

3.6 Optical fiber standard coupler

It refers to the optical fiber coupler for which the working bandwidth <= "nominal

center wavelength ± 20nm".

3.7 Optical fiber broadband coupler

It refers to the optical fiber coupler for which the working bandwidth >= "nominal

center wavelength ± 40nm".

3.8 Optical fiber single window broadband coupler

It refers to, under a single optical communication window (such as 1310nm or

1550nm), the optical fiber coupler complying with the requirements that the

working bandwidth >= "nominal center wavelength ± 40nm".

3.9 Optical fiber dual window broadband coupler

It is the measurement of the input optical power as caused by the optical fiber

branching device which is returned along the input path. It is expressed in

decibels (dB) AND calculated in accordance with the formula (8).

Where.

Pj - The optical power incident on the input end, in mW;

Pr – The returned optical power as received at the same input end, in mW.

4.1 Optical fiber broadband coupler

4.1.1 Classification

- It is divided into single window broadband coupler and the dual window

broadband coupler based on the working window which is covered by the

device performance;

- It is divided into tree broadband coupler (1 × N) and star broadband

coupler (N × N) based on the device working state;

- It is divided into the pigtail type and connector type based on the

configuration of the device leading out port.

4.1.2 Optical fiber for optical fiber broadband couplers

The optical fiber used is generally single-mode optical fiber.

4.2 Optical fiber wavelength division multiplexing coupler

4.2.1 Classification

Fused tapered optical fiber wavelength division multiplexers are typically two

wavelength multiplexing/demultiplexing devices.

It is generally divided into the following types in accordance with the

differences of the multiplexing wavelength.

a) 1310nm / 1550nm wavelength division multiplexing coupler;

b) 1480nm / 1550nm wavelength division multiplexing coupler;

c) 980nm / 1550nm wavelength division multiplexing coupler;

d) 980nm / 1310nm wavelength division multiplexing coupler.

- 30 dB spectral width. <= 5 nm (A = 1310 nm), 10 nm (lambda = 1550 nm)

- Power stability. better than ± 0.05 dB (- 10 °C ~ +50 °C, 1 h)

6.3.2 Mode disturbance unit (E)

The mode disturbance unit used is a 1 km length single-mode fiber, or a 5 m

single-mode fiber in the middle of which two in the middle of playing two Phi 30

mm circles are made, AND the fiber parameters shall comply with the

provisions of YD/T 895.

6.3.3 Detection unit (D)

It uses the optical power meter, AND its performance indicators must comply

with the following requirements.

- Wavelength. 0.75 ~ 1.7 µm;

- Absolute measurement accuracy (-23 dBm). ± 5%

- Dynamic range. - 80 ~ 0 dBm

- Linearity. Better than ± 0.05 dB

6.3.4 Spectrum analyzer (OSA)

The resolution of the spectrum analyzer shall be higher than the spectral width

of the measuring light source.

6.3.5 Optical fiber standard connector (SR)

It shall comply with the requirements of clause 3.14 of this standard.

6.3.6 Temporary joints (TJ)

MAKE butt joint of the two ends of the optical fibers, the joint loss is < 0.1 dB,

ND it is good in stability.

6.3.7 Device leading out fiber length (cable) length

The length of the device leading out fiber (cable) shall not be less than 1 m.

6.4 Measurement of excess loss (cutting method)

It shall be in accordance with clause 6.4 of YD/T 893-1997.

6.5 Measurement of insertion loss

It shall be in accordance with clause 6.4 in YD/T 893-1997 and clause 6.4 in

YD/T 964-1998.

6.6 Directionality measurement

6) From the spectral region, RECORD the sample insertion loss and the

isolation change; from the device indicator range as specified in Table 1

to Table 4, READ the maximum and the minimum wavelength value, AND

the difference between the two is the working bandwidth of the device.

6.9 Measurement of polarization dependent losses

PERFORM measurement in accordance with the method A of IEC 61300-3-2

(1999).

6.10 Measurement of wavele...

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